Answer:
D Heat
Explanation:
Tell me if you need explain
ALLEN
What is the mass of 4.00cm ^ 3 of sodium with density = 0.97g / cm?
Answer:
he given density is 0.97 g/cm³, and the volume is 4.00 cm³.
To find the mass, we can use the formula:mass = density x volume
Substituting the given values,
we get:mass = 0.97 g/cm³ x 4.00 cm³mass = 3.88 g
Therefore, the mass of 4.00 cm³ of sodium with a density of 0.97 g/cm³ is 3.88 g.
Explanation:
If the earth is 1.50X108 Km from the sun, what is the distance
in Gm?
Answer:
1.50 Gm
Explanation:
The distance from the Earth to the Sun can be converted from kilometers to gigameters (Gm) by dividing by 10^9:
1.50 x 10^8 km / 10^9 = 1.50 Gm
So, the distance from the Earth to the Sun is 1.50 Gm.
ALLEN
state and explain Five causes of accidents in science laboratory
Explanation:
Chemical hazards: Handling toxic substances can cause irritation and carcinogenicity.
Biological hazards: Biological hazards include hazards from working with small animals, working with bloodborne pathogens and working with biological agents, such as viruses and bacteria.
Physical hazards: Physical hazards include exposure to noise, poor posture and the explosibility and flammability of substances.
Safety hazards: Safety hazards include unbalanced centrifuges, danger when handling hot sterilized items and electrical hazards, such as shock, explosions, blasts and electrocutions.
Allergy hazards: A common allergy hazard in the laboratory setting is a latex allergy, as many of the materials used in a laboratory setting are latex.
Dangers in the laboratory setting can also come from unsafe practices, including:
Working alone in the laboratory
Neglecting to wear a lab coat
Lack of safety training
Consider the chemical equation in equilibrium.
2H₂(g) + O₂(g) → 2H₂O(g)
What will happen if the pressure of the system is increased?
If the system's pressure is increased, the equilibrium will shift in the direction that decreases the total number of gas molecules in the system.
How does changing pressure affect the equilibrium?The effect of changing pressure on an equilibrium depends on the reaction's stoichiometry and the total number of moles of gas present in the system. For example, if the reaction produced more gas molecules on the product side, an increase in pressure would shift the equilibrium to the left, in the direction of the reactants.
What is stoichiometry?Stoichiometry is a branch of chemistry that deals with calculating the quantities of reactants and products involved in a chemical reaction. In any chemical reaction, the reactants combine to form products according to a specific chemical equation that shows the reaction's stoichiometry.
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a specie with initial concentration 1.4×10^-2 mol L-1 decay by first order kinetics with a rate constant 2.35×10^2L mol-1 s-1. what is the half-life if this specie?
Answer:
293 ms
Explanation:
The half-life of a first-order reaction can be calculated using the following formula:
t1/2 = 0.693 / k
Where t1/2 is the half-life and k is the rate constant.
For this reaction, the rate constant is 2.35 x 10^2 L/mol/s, so:
t1/2 = 0.693 / (2.35 x 10^2 L/mol/s) = 0.293 / (2.35 x 10^2) s = 0.000293 s = 293 ms
Answer:
0.293 / 2.35 × 10^2 seconds.
Explanation:
The half-life of a first order reaction can be calculated using the equation:
t1/2 = 0.693 / k
where t1/2 is the half-life, k is the rate constant, and 0.693 is the natural logarithm of 2.
Substituting the values given in the question:
t1/2 = 0.693 / 2.35 × 10^2 L mol-1 s-1 = 0.293 / 2.35 × 10^2 s
So, the half-life of the species is approximately 0.293 / 2.35 × 10^2 seconds.
The Haber Process involves nitrogen gas combining with hydrogen gas to produce
ammonia.
N. + 3H2 - 2NH,
10.0 grams of nitrogen gas is reacted with 10.0 grams of hydrogen gas.
Find the following: the molar mass of reactants and products, the limiting reactant.
the excess reactant, the amount of ammonia produced.
17.04 grams
12.16 grams
hydrogen gas
28.02 grams
nitrogen gas
1. The limiting reactant
2. The excess reactant
3. Molar mass of hydrogen gas
4. Molar mass of nitrogen gas
5. Molar mass of ammonia (NHb)
6. Amount of ammonia produced
2.02 grams
The limiting reactant: Nitrogen gas (N2)
The excess reactant: Hydrogen gas (H₂)
Molar mass of hydrogen gas: 2.016 grams/mol
Molar mass of nitrogen gas: 28.02 grams/mol
Molar mass of ammonia (NH3): 17.04 grams/mol
What is Haber process ?The Haber process is a high-temperature, pressurized ammonia-gas synthesis. According to the balanced reaction, three moles of hydrogen and one mole of nitrogen gas yield two moles of ammonia gas.
Molecular mass of H₂ is 2 g/mol
molecular mass of N₂ is 28 g/mol
No.of moles in 10 g of H₂ is 10/2
= 5 moles.
no.of moles in 10 g of N₂ is 10/28
= 0.35 moles.
Here, the nitrogen gas is fewer in amount, and it is the limiting reactant in the reaction and hydrogen is the excess reactant.
Molar mass of NH₃ = 17 g/mol
1 mole or 28 g of nitrogen gives 2 moles or 34 g of ammonia. Hence, 10 g of nitrogen gas will give,
(10 × 34) / 28
= 12.14 g of NH₃.
Thus, 12.14 g of NH₃ is produced by 10 g of nitrogen gas in this reaction.
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Which answer choice best describes the law of conservation of energy?
A. Energy can be created but not destroyed.
B. Energy can be both created and destroyed.
C. Energy cannot be created nor destroyed it just changes form.
D. Energy cannot be created, but it can be destroyed.
The density of muscle tissue is approximately 1.055 g/mL. How many grams of muscle tissue would be contained in 24 mL of muscle tissue?
For the reaction below, how many moles of aluminum are produced from 14 moles of
lithium?
3Li (s) + AI(NO3)3 (aq) --> 3LINO3(aq) + Al(s)
Answer:
4.67 moles of aluminum
Explanation:
For the reaction:
3Li (s) + AI(NO3)3 (aq) --> 3LiNO3(aq) + Al(s)
The number of moles of aluminum produced from 14 moles of lithium can be determined by using the mole ratio between aluminum and lithium in the balanced chemical equation. The mole ratio between aluminum and lithium in the reaction is 1:3, which means that for every 3 moles of lithium, 1 mole of aluminum is produced. Therefore, the number of moles of aluminum produced from 14 moles of lithium can be calculated as follows:
14 moles of Li / 3 moles of Li per mole of Al = 4.67 moles of Al
So, 14 moles of lithium will produce 4.67 moles of aluminum.
The half-life of Tl
-201 is 3.0 days. How many days will it take until the activity of the Tl
-201 in Simones body is one-fourth of the initial activity?
It will take approximately 4.39 days until the activity of the Tl-201 in Simone's body is one-fourth of the initial activity.
How does Half-Life Reaction work?The time it takes for half of a substance's radioactive nuclei to decay is known as its half-life. It is a radioactive substance is characteristic property that is used to determine a material's rate of decay. A decay curve that plots the number of radioactive atoms remaining over time can be used to determine a substance's half-life. Radiometric dating, nuclear medicine, and radiation safety all make use of half-life.
The decay of Tl-201 follows first-order kinetics. The equation for the decay of a radioactive substance is given by:
N = N0 × [tex]1/2^{t/t/2}[/tex]
where N is the amount of the substance at time t, N0 is the initial amount of the substance, t1/2 is the half-life of the substance, and t is the time that has elapsed.
We are given that the half-life of Tl-201 is 3.0 days. This means that if we start with an initial activity of A0, the activity at any time t is given by:
A = A0 * [tex]1/2^{t/3}[/tex]
We want to know how many days it will take until the activity of the Tl-201 in Simone's body is one-fourth of the initial activity. Let's call this time t₁ :
A = A 0/4
= A0 × (1/2)[tex]^{t^{1/3} }[/tex]
Dividing both sides by A0 and taking the logarithm of both sides, we get:
ln(1/4)
= - [tex]t^{1/3}[/tex] × log(2)
Solving for t₁, we get:
t₁ = (3/log(2)) × log(4)
= 4.39 days
Therefore, it will take approximately 4.39 days until the activity of the Tl-201 in Simone's body is one-fourth of the initial activity.
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What is the concentration of compound A if the absorbance of a solution containing compound A is 0.445? The molar absorptivity of compound A is 13.7 (M-1cm-1) and the light path of a cuvette is 1.00 cm.
The concentration of compound A is 0.0325 M.
What is Absorbance?In physics and chemistry, "absorbance" (also known as "optical density") is a measure of how much light is absorbed by a material as it passes through it. It is expressed as a logarithmic ratio of the intensity of the incident light (I0) to the intensity of the transmitted light (I), typically using the formula A = -log(I/I0). The absorbance of a material depends on its composition and the wavelength of the incident light. Absorbance is commonly used to quantify the concentration of a substance in a solution, using a spectrophotometer or other optical instrument that can measure the amount of light absorbed by the solution at a specific wavelength. The Beer-Lambert law states that there is a linear relationship between absorbance and concentration, making it a useful tool in analytical chemistry and biochemistry.
According to question:
The Beer-Lambert law relates the absorbance of a solution to the concentration of a compound and the path length of the cuvette:
A = εlc
where A is the absorbance, ε is the molar absorptivity, l is the path length, and c is the concentration.
To solve for the concentration, we can rearrange the equation:
c = A / (εl)
Substituting the given values:
c = 0.445 / (13.7 M^-1cm^-1 x 1.00 cm)
c = 0.0325 M
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True or false if an employee asked to use a powered air, purifying respirator in place of a negative pressure respirator the employer must provide the PARP to the employee
True. If an employee requests to use a Powered Air-Purifying Respirator (PAPR) in place of a negative pressure respirator.
define Powered Air-Purifying Respirator ?
A Powered Air-Purifying Respirator (PAPR) is a type of respirator that uses a motor to draw air through a filter to clean it before delivering it to the wearer's breathing zone. PAPRs are designed to protect the wearer from inhaling harmful substances, such as dust, smoke, fumes, and particulate matter.
True. If an employee requests to use a Powered Air-Purifying Respirator (PAPR) in place of a negative pressure respirator, the employer must provide the PAPR to the employee if it provides the same or greater level of protection as the negative pressure respirator. This is because the employer has a legal responsibility to provide a safe and healthy work environment for employees, and to ensure that employees are protected from workplace hazards to the extent feasible. Providing a PAPR may be necessary to achieve this goal, depending on the specific circumstances of the workplace and the hazards present.
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How many moles of Al2S3 are
equivalent to 605 g Al2S3?
(Al2S3 = 150.17 g/mol)
? 1 mol Al₂S3
The number of moles of Al2S3 that would be equivalent to 605 g of the compound will be 4.03 moles.
Number of moles calculationThe number of moles in a particular mass of a compound is the ratio of the mass of the compound and the molar mass of the compound.
Mole = mass/molar mass
Molar mass of Al2S3 = 150.17
Mole of 605 g Al2S3 = 605/150.17
= 4.03 moles
In other words, the number of moles of 605 g Al2S3 is 4.03 moles.
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How many moles are contained in 0.159 grams of aluminum sulfate, Al2(SO4)3?
0.159 grams of aluminum sulfate contains 0.000465 moles.
How to determine the number of moles of aluminum sulfate (Al2(SO4)3) in 0.159 gramsFirst we need to first calculate the molar mass of Al2(SO4)3.
Molar mass of Al2(SO4)3 = (2 x atomic mass of Al) + (3 x atomic mass of S) + (12 x atomic mass of O)
= (2 x 26.98 g/mol) + (3 x 32.06 g/mol) + (12 x 16.00 g/mol)
= 342.15 g/mol
Now, we can use the following formula to calculate the number of moles:
number of moles = mass / molar mass
Plugging in the values, we get:
number of moles = 0.159 g / 342.15 g/mol
number of moles = 0.000465 moles
Therefore, 0.159 grams of aluminum sulfate contains 0.000465 moles.
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Which statement best describes the difference between a physical change and a chemical change? Responses A chemical change results in a new element being formed, and a physical change results in a new compound being formed. A chemical change results in a new element being formed, and a physical change results in a new compound being formed. A physical change produces a new element, and a chemical change results in a bond breaking between atoms. A physical change produces a new element, and a chemical change results in a bond breaking between atoms. A chemical change does not result in a new substance being formed, whereas a physical change does. A chemical change does not result in a new substance being formed, whereas a physical change does. A physical change is a change from one state of matter to another; a chemical change results in a new substance formed.
A physical change is a change to a substance that does not result in the formation of a new substance.
What is formation ?Formation is the process of creating something new. It can refer to the creation of an organization, structure, or system. It is often used in business, when a company is established, or when a new product or service is created. It can also refer to the development of an idea or concept, such as a strategic plan or marketing campaign. Formation is an essential part of any entrepreneurial venture, and involves the development of a plan for a business, including the selection of personnel, market research, and the development of a financial structure. Formation is also used to refer to the development of a team or organization, and the process of creating and maintaining a cohesive and effective team of individuals.
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Which coefficients correctly balance the equation below
KOH+BaCI- -> KCI + Ba(OH)2
2,2,2,1
1,2,1,2
2,1,2,1
2,2,2,1
The coefficients that correctly balance the equation below would be 2,1,2,1. The third option.
Balancing chemical equationsA balanced chemical equation will have an equal number of different atoms in the reactants and in the products, irrespective of whether there is a change of form or otherwise.
Thus, the balanced equation of the reaction whose equation is shown would be: [tex]2KOH+BaCI_2- - > 2KCI + Ba(OH)_2[/tex]
In other words, the coefficients of the correctly balanced equation are 2,1,2,1.
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Using tabulated ∆° values in the text, determine the enthalpy change (in kJ) that occurs during the formation of water from its elements.
32 ()+2 ()→22(l) ∆=?
The enthalpy of formation of H₂ and O₂ are zero. Then , the enthalpy of formation of water is 285 kJ.
What is enthalpy of formation ?Enthalpy change of a chemical reaction of physical change is the change in heat energy absorbed or evolved during the change or reaction. It is represented as ΔHf⁰.
The enthalpy of formation of elements in molecular state is zero. Hence the enthalpy of formation of H₂ and O₂ are zero.
The enthalpy of formation of water = -285 kJ.
enthalpy of reaction = enthalpy of products - enthalpy of reactants.
ΔHr = -285 kJ - 0+0 = - 285 kJ.
Therefore, the enthalpy change during the formation of water from its elements is - 285 kJ.
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Your complete question is as follows:
Using tabulated ∆Hf° values in the text, determine the enthalpy change (in kJ) that occurs during the formation of water from its elements:
2 H2 (g) + O2 (g) → 2 H2O (l) ∆H = ?
C5H12(l)+8O2(g)→5CO2(g)+6H2O(g) express answers as intergers
The balanced equation for the reaction of pentane (C5H12) with oxygen gas (O2) to produce carbon dioxide (CO2) and water (H2O) is: C5H12(l) + 8O2(g) → 5CO2(g) + 6H2O(g).
What is reaction?Reaction is the process of responding to a stimulus or situation. It can be physical, emotional, mental, or social. Reactions can vary depending on the individual and the context, and they can be positive or negative. Examples of reactions include feeling anger, joy, sadness, or fear when faced with a situation.
The ratio of reactants to products in this reaction is 1:5:6:8. This means that for every 1 molecule of pentane (C5H12), 5 molecules of carbon dioxide (CO2), 6 molecules of water (H2O), and 8 molecules of oxygen gas (O2) are required. Therefore, the answer to the question is 8, as 8 molecules of oxygen gas (O2) are needed to react with 1 molecule of pentane (C5H12).
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Which coefficients correctly balance the equation below
Ba3N2+HOH - -> Ba(OH)2+NH3
1,6,1,2
1,3,3,2
1,6,3,2
2,6,3,2
The coefficients that correctly balance the given equation is 1. 6, 3,2
The correct option is C
What is a balanced equation of a reaction?A balanced equation of a reaction is an equation in which the moles of atoms of elements of the reactants are equal to the moles of atoms of the product.
According to the law of conservation of matter, matter is neither created nor destroyed, hence, the mass of the reactants must be equal to the mass of products at the end of any given chemical reaction.
The balanced equation of the given reaction is as follows:
Ba₃N₂+ 6 HOH - -> 3 Ba(OH)₂ + 2 NH₃
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How many water molecules are in a block of ice containing 2.00 mol
of water ( H2O)?
According to the question the answer is 1.204 x 10^24 molecules of water.
What is molecules?Molecules are the smallest particles of matter that can exist in a stable form. They are made of two or more atoms that are held together by chemical bonds. Molecules are the basis of all living things, and they are the building blocks of all matter. They come in a variety of shapes and sizes, and they can be composed of atoms of different elements. Molecules can be found in the air, in liquids, and in solids. They can be found in both organic and inorganic compounds, and they are essential components of life. Molecules play an important role in many chemical and biological processes, and they can be used to create new materials and products.
The number of water molecules in a block of ice containing 2.00 mol of water (H2O) can be calculated using the Avogadro's number, which is 6.02 x 10^23 molecules per mol. Therefore, the answer is 1.204 x 10^24 molecules of water.
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10. What is lost in an atom as a result of radioactive decay? What equation relates this loss to
energy produced? (1 pt)
Mass that is number of protons and neutrons is lost in an atom as a result of radioactive decay.
What is an atom?
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
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The molar absorptivity of a compound at 500 nm wavelength is 252 M*1cm 1. Suppose one prepares a solution by dissolving 0.00140
moles of a solute in enough water to make a 500.0 mL solution. What would be the absorbance in a 4.00 mm pathlength cell?
Answer:
A = 252 * 0.04 * 0.0028 = 0.275584
Therefore, the absorbance of the solution in a 4.00 mm pathlength cell is approximately 0.28.
Explanation:
Answer:
0.28
Explanation:
The formula to calculate the absorbance of a solution is given by:
A = ε * l * c
Where:
A = absorbance
ε = molar absorptivity (L/mol cm)
l = pathlength (cm)
c = concentration (mol/L)
The molar absorptivity of the solute at 500 nm is 252 M^-1cm^-1, and the concentration of the solute in the solution is 0.00140 moles in 500.0 mL, so c = 0.00140 / 0.500 = 0.0028 M.
A = ε * l * c = 252 M^-1 cm^-1 * 4.00 mm * 0.00280 M = 2.16
So, the absorbance in a 4.00 mm pathlength cell would be 2.16.
The following are the conjugate bases of some strong and weak acids. Which of these would you expect to act as a base if placed in aqueous solution? (1) HCOO (ii) HCO3 (iii) HSO4 (iv) H2PO4 (v) Br" (vi) F a.(i),(ii),(iv), and (vi) onlyb. (i),(ii),(iii),(iv), and (vi) onlyc. (iii) onlyd. (i),(ii),(iii),(iv) onlye. all of them
Due to the strength of their conjugate acids, I would anticipate that I (ii), (iv), and (vi) would behave as bases if put in an aqueous solution. As both alternatives (a) and (d) contain the conjugate bases of weak acids, they are both accurate.
Strong acids' conjugate bases, such as (v) Br- and (vi) F-, cannot take any more protons since they are already fully deprotonated and cannot function as bases in aqueous solutions. Strong acids have conjugate bases that may receive protons and function as bases in aqueous solutions. These bases include I HCOO-, (ii) HCO3-, (iii) HSO4-, and (iv) H2PO4-. As both alternatives (a) and (d) contain the conjugate bases of weak acids, they are both accurate. Because (v) and (vi), which are conjugate bases of strong acids and cannot function as bases, are included in Option (b), it is wrong. Option (c) is untrue because it only accounts for the conjugate bases of strong acids and ignores those of weak acids.
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Which answer choice BEST explains why the cyclist must be fed if she wants to continue to pedal her bike?
A. All of her stored chemical energy was transformed.
B. She was hungry.
C. She destroyed all of her chemical energy while riding her bike.
D. She needed to create more stored chemical energy.
The sun provides _____ to a plant, when a person eats the plant, ____ is released and then transforms into___ when the person goes for a run
Answer: no answer
Explanation:
Aluminum bromide and chlorine gas react to form aluminum chloride and bromine gas.
The balanced equation is : Aluminum bromide and chlorine gas react to form aluminum chloride and bromine gas.
AlBr₃ + 3Cl ---> AlCl₃ + 3Br
The Aluminum bromide and chlorine gas will react to form the aluminum chloride and the bromine gas
AlBr₃ + Cl ---> AlCl₃ + Br
reactant product
Al 1 1
Br 3 1
Cl 1 3
The chemical equation is said to be the balanced equation if the atoms of the reactants side is equals to the atoms of the product side. Multiplying the 3 in Cl and the 3 in the Br. The equation is as follows :
AlBr₃ + 3Cl ---> AlCl₃ + 3Br
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This question is incomplete, the complete question is :
Balance the chemical equation : Aluminum bromide and chlorine gas react to form aluminum chloride and bromine gas.
The percent by mass of cobalt(II) in COSO3 is _____%.
please help.
The percentage by mass of cobalt in cobalt sulfate is 42.39%.
How to calculate percent by mass?The mass percentage of a solution equals the mass of an element in one mole of the compound divided by the molar mass of the compound, multiplied by 100.
Percent by mass = (atomic mass of element/atomic mass of compound) × 100
According to this question, cobalt sulfate is given in this question. The atomic mass of cobalt is 58.93g/mol while the atomic mass of cobalt sulfate is 138.996g/mol.
% by mass = (58.93 ÷ 138.996) × 100
% by mass = 42.39%
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Calculate the quantity of O₂ would be required to generate 13.0 mol of NO₂ in the reaction below assuming the reaction has only 67.1% yield.
2 NO (g) + O₂ (g) → 2 NO₂ (g)
Solving the Question
We're given:
[tex]2 NO_{(g)} + O_{2(g)}\rightarrow 2 NO_{2 (g)}[/tex][tex]n_{NO_2}=13.0\hspace{4}mol[/tex][tex]\%\hspace{4}yield=67.1\%[/tex]First, let's calculate the theoretical yield of NO2.
⇒ [tex]\%\hspace{4}yield=\dfrac{actual\hspace{4}yield}{theoretical\hspace{4}yield}[/tex]
The yield of NO2 we must produce is 13.0 mol.
⇒ [tex]\%\hspace{4}yield=\dfrac{13.0}{theoretical\hspace{4}yield}[/tex]
We're also given that the percentage yield of this reaction is 67.1%.
⇒ [tex]0.671=\dfrac{13.0}{theoretical\hspace{4}yield}[/tex]
⇒ [tex]theoretical\hspace{4}yield=\dfrac{13.0}{0.671}\\\\theoretical\hspace{4}yield=19.3740685544\hspace{4}mol[/tex]
First, construct a mole ratio between O2 and NO2.
From the balanced chemical equation, we know that 1 mol of O2 can produce 2 mol of NO2:
⇒ [tex]\dfrac{n_{O_2}}{1}=\dfrac{n_{NO_2}}{2}[/tex]
We're given that we must theoretically produce 19.3740685544 mol of NO2:
⇒ [tex]\dfrac{n_{O_2}}{1}=\dfrac{19.3740685544}{2}[/tex]
⇒ [tex]n_{O_2}=9.6870342772\hspace{4}mol[/tex]
Round to significant figures (3):
⇒ [tex]n_{O_2}=9.69\hspace{4}mol[/tex]
Answer[tex]n_{O_2}=9.69\hspace{4}mol[/tex]
What is the importance of the pH scale in determining the acidity or basicity of a solution?
Answer:
because it provides a numerical value for the concentration of hydrogen ions in a solution.
Explanation:
Answer:
The pH scale is important in determining the acidity or basicity of a solution because it provides a numerical value for the concentration of hydrogen ions in a solution. The pH of a solution ranges from 0-14, with values below 7 being acidic, values above 7 being basic, and 7 being neutral.
Explanation:
Colorimetric Analysis of Asprin Chem Lab:
Students prepared a solution by hydrolyzing 0.3219 g of a crushed aspirin tablet in NaOH and then diluting with DI water in a 100-mL volumetric flask. Next, they transferred 1.50 mL of the solution to a 50-mL volumetric flask and diluted to the mark with FeCl3-KCl-HCl solution. The absorbance of the dilution was 0.346. Using their standard curve, they determined the concentration to be 5.02 × 10e-4 mol/L. If an aspirin tablet weighs 0.4267 g, determine the mass of ASA (in mg) per tablet.
*Note the answer is 400 mg and the Molarity of the standard solution is unknown.
-To account for not using the whole crushed tablet multiply by the ratio of m(tablet)/m(tablet used).
-I'm not sure which step in the calculations to apply this ratio.
-Any help would be greatly appreciated!
The mass of ASA - Acetylsalicylic acid per tablet is 214.9 mg. The number of moles present in the tablet, is 0.001190.
For this experiment it is important to find the number of moles of ASA present in the solution. By doing this we will get the amount of ASA in the tablet also.
Students prepared a solution by hydrolyzing 0.3219 g of a crushed aspirin tablet in NaOH and then diluting with DI water in a 100-mL volumetric flask.
Number of moles = mass of ASA / molar mass of ASA
The molar mass of ASA = 180.16 g/mol
Therefore, Number of moles = 0.3219 g / 180.16 g/mol
= 0.001785 mol.
Now finding the number of moles present in the tablet,
Moles in tablet = (moles of ASA from solution) x (mass of tablet / mass of solution)
= 0.001785 mol x (0.4267 g / 0.3219 g x 1.50 mL / 50 mL)
= 0.001190 mol
Now finding the mass of ASA,
Mass of ASA per tablet = (moles of ASA in tablet) x (molar mass of ASA)
= 0.001190 mol x 180.16 g/mol
= 0.2149 g or 214.9 mg
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