What is the molar concentration of a solution prepared by dissolving 8.63 g of Ba(NO3)2 (molar mass = 261.35 g/mol) to a total volume of 250.0 mL?
What is the molar concentration of a solution prepared by diluting 10.0 mL of the solution in Question #1 to a total volume of 50.00 mL?
The concentration of the solution is 0.132 M, the concentration of the diluted solution is 0.026 M.
Given that;
number of moles = concentration × Volume
Concentration = number of moles/volume
But number of moles = mass/molar mass
mass = 8.63 g
Molar mass = 261.35 g/mol
Hence, number of moles = 8.63 g/261.35 g/mol = 0.033 moles
volume = 250.0 mL or 0.25 L
concentration = 0.033 moles/0.25 L = 0.132 M
For the second part of the question;
Using the dilution formula, C1V1 =C2V2
C1 = initial concentration = 0.132 M
V1 = initial volume = 10.0 mL
C2 = Final concentration = ?
V2 = Final volume = 50.00 mL
C2 = 0.132 M × 10.0 mL/ 50.00 mL
C2 = 0.026 M
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Planets, asteroids, and comets orbit the Sun in our solar system because the Sun is the__________
Strongest magnetic field in the solar system
Most massive object in the solar system
Answer:
strongest magenetic field in the solar system
Explanation:
describe the structure of a typical metal such as iron ?
assaaap
Answer:
Metals consist of giant structures of atoms arranged in a regular pattern. The electrons from the outer shells of the metal atoms are delocalised , and are free to move through the whole structure. This sharing of delocalised electrons results in strong metallic bonding .
Explanation:
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Which of the following steps is important to critical thinking?
implementing solutions
b utilizing facts
c. holding firm to conclusions
d answering questions
Please select the best answer from the choices provided
Answer:
b
Explanation:
edge 2022
Which is a strong base?
A. HCl
B. NaOH
C. NH3
D. H3CO3
Answer:
c
Explanation:
Answer:
B
Explanation:
At this location, it is winter because the North Pole is tilted
Towards the sun
Away from the sun
Answer:
Away from the sun
Explanation:
winter
In the Northern Hemisphere, winter generally begins on December 21 or 22. This is the winter solstice, the day of the year with the shortest period of daylight. Summer begins on June 20 or 21, the summer solstice, which has the most daylight of any day in the year.
Given R = 0.0821L⋅atm/mol⋅k, what is the volume of mole of gas at a pressure of 3.12 atm and a temperature of 270K?
A. 69.2 L/mol
B. 86.5 L/mol
C. 22.2 L/mol
D. 7.10 L/mol
Answer:
The answer is d
Explanation:
Answer:
The answer is D
Explanation:
Look at diagram 1 above. What type of eclipse is shown based on the alignment of the Earth, Sun, and Moon?
Solar eclipse
Lunar eclipse
Katie looks out her bedroom window on a clear night. The stars in the sky look like tiny points of light.
Katie knows that the Sun is also a star, but it looks much larger than all of the other stars in the sky.
Why do the stars in the night sky look so much smaller than the Sun?
Answer:
The Sun looks bigger than other stars because its more closer to the earth than the stars.the farther anything is distant from us the tinier it will look
Explanation:
plz mark brainliest if thats ok|?
Calculate the heat produced by hydrolysis of 65 kg of ATP (the molecular weight of ATP is 507.18 g/mol).
The heat produced by hydrolysis of 65 kg of ATP is -6.8 kJ.
Let's consider the thermochemical equation for the hydrolysis of ATP.
ATP + H₂O ⇒ ADP + Pi ΔG = -57 kJ/mol
We will convert 65 kg of ATP to moles using its molecular weight (507.18 g/mol).
[tex]65 \times 10^{3} g \times \frac{1mol}{507.18g} = 1.2 \times 10^{2} mol[/tex]
57 kJ of heat are released by the hydrolysis of 1 mole of ATP. The heat released by the hydrolysis of 1.2 × 10² moles of ATP is:
[tex]1.2 \times 10^{2} mol \times \frac{(-57kJ)}{1mol} = -6.8 \times 10^{3} J = -6.8 kJ[/tex]
-6.8 kJ is the heat produced by hydrolysis of 65 kg of ATP.
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the modern periodic table is organized by increasing ______________ ___________.
Answer:
atomic number.
Explanation:
Answer:
Atomic number
Explanation:
The modern periodic table lists the elements in order of increasing atomic number (the number of protons in the nucleus of an atom).
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convert 5.65 x 10^26 atoms of phosphorus to moles
Answer:
938.54 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question
[tex]n = \frac{5.65 \times {10}^{26} }{6.02 \times {10}^{23} } \\ = 938.5382[/tex]
We have the final answer as
938.54 molesHope this helps you
A quarter moon is called this because
Explanation:
A quarter moon is called a quarter moon because it is the moment the moon has reached the first quarter of it orbit around the earth
Help Help Help!:
Which option would be an appropriate model of nuclear fission?
A. dividing a stack of paper equally between two people
B. taking a teaspoon of sugar from a bowl
C. disturbing a drop of water such that it breaks into smaller droplets
D. cutting a cake in half
Answer:
c
Explanation:
because your separating the atoms in the water
The appropriate model for nuclear fission is disturbing a drop of water such that it breaks into smaller droplets.
Nuclear fission refers to the disintegration of a large nucleus when it is bombarded with a small particle.
Usually, the protons in the nucleus repel each other strongly. Hence, as the atomic number of atoms continues to increase, this repulsion exceeds the nuclear attractive force causing the atom to disintegrate into smaller fragments called daughter nuclei when disturbed just as a drop of water such that it breaks into smaller droplets when disturbed.
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Help please!! I thought it was 374.8 but it keeps saying to check my significant digits
Answer:
ok
Explanation:
i am doing now so
6Na(s) + N2(g) --> 2Na3N(s)
Answer:
80.0 g Na and 20.0 g N2.
Explanation:
This means the limiting reactant determines the maximum mass of the product formed.
Polymers are large organic molecules that are made of
a.
cations.
c.
carbon and oxygen only.
b.
anions.
d.
repeating units.
Answer:
D) Repeating units.
Explanation:
Polymers are large macromolecules which are made up of many repeating structural units called monomers :)
Why are iron oxides in rocks evidence for prehistoric photosynthesis? (1 point)
o Iron oxides form when carbon dioxide, a reactant of photosynthesis, is in the atmosphere.
o Iron oxides form when cyanobacteria use carbon dioxide for photosynthesis.
o Iron oxides form when cyanobacteria produce oxygen via photosynthesis.
o Iron oxides form when oxygen, a product of photosynthesis, is in the atmosphere.
Answer:
Iron oxides form when oxygen, a product of photosynthesis, is in the atmosphere.
How can you identify the gas produced in a chemical reaction without observing the atoms and molecules directly?
To identify the gas produced in a chemical reaction without observing the atoms and molecules directly through the characteristics of the gas.
Chemical reaction is defined as the process by which substances (known as reactants) combine together with the formation of bonds to form products.
There are some signs that shows that chemical reaction has occurred. They include:
Color Change Change of temperatureGiving off gas (Evolution of gas)Therefore, the production of gas from a chemical reaction shows that a reaction has occurred.
These gases can be identified without observing the molecules through that characteristics of the gas. This include:
the smell of the gas: For example when a gas is given off, and it smells like urine, it's likely to be ammonia gas. color change that occurs during the chemical reaction can show the type of gas that was given off. For example when lime water turns into milky color, it shows the presence of carbondioxide gas.Learn more here:
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how do you determine the total number of Valence electrons that are used to make a particular lewis structure for a compound or an ion?
Answer:
The number of valence electrons of an element can be determined by the periodic table group (vertical column) in which the element is categorized.
Explanation:
Hope it helps!
Write the symbolic notation of an isotope of an element having 8 protons, 8 electrons, and 10 neutrons. Click on the “Templates” button template button and make use of the "stacked super/subscript" button button for entering stackes super/subscripts for entering the mass number and atomic number of the isotope.
Answer:
8 electróns
Explanation:
because the Last protons
can anyone send me the structure of iron ?
;
Answer:
HOPE IT HELPS
Explanation:
PLS MARK BRAINLIEST ^_^
Answer:
Here you go dear..
Here's the structure of iron you were talking about earlier..
(ㆁωㆁ)(◍•ᴗ•◍)
Explanation:
Hope it helps you..
Your welcome in advance..
(ㆁωㆁ)
please answer this correctly
Answer:
B. basic
Explanation:
Because acidic is sour in test, salt is tasty in taste, and neutral neither bitter, tasty and nor sour
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Read the following statement:
For every action, there is an equal and opposite reaction.
Does the statement describe a scientific law?
Yes, because it describes action-reaction force pairs
No, because it describes action-reaction force pairs
Yes, because it is applicable to a single or only a few events in the natural world
No, because it is applicable to a single or only a few events in the natural world
Yes, because it describes action-reaction force pairs
calculate the pH of the following
A.0.02mol/L HCI
B. 0.1 mol/L NaOH
Answer:
A.
Explanation:
hope it helps
The variable that we change or test in an experiment is called the
A) Dependent variable
B) Independent variable
C) Constant
the variable that we change in an experiment is the Independent Variable. The dependent variable is the outcome and the constant is what remains the same throughout the experiment.
♔♔what is tincture of iodine?what is it's use?✞☽☻☾✞
Answer:
Iodine tincture also known as weak iodine solution is a combination of iodine, sodium iodide, ethanol, and water. It is a disinfectant or antiseptic.
Applications:
When we get cuts and scratches it is applied. It is used mainly to clean the skin to prevent bacterial infections.
Explanation:
Hope this helps you. Have a nice day. Please mark as brainliest. It helps a lot.^_^
Find out how filtration is used in the human body ?
Answer:
Filtration is the removal or filtering of the toxins and waste products from the blood by the kidney. They are excreted from the body through urine. In general, filtration refers to the passing of a liquid through a filter. In the human body, the kidney functions as a filter.
Explanation:
What types of safety procedures need to be followed when handling and transporting nitric acid?
Answer:
wear safety glasses, a face shield, gloves.
Explanation:
Nitric Acid Safety, Handling & First Aid When handling nitric acid in the workplace, we strongly recommend you wear chemical safety glasses, a face shield for splash protection, gloves, and an approved vapor respirator if adequate ventilation is not available. I found this online. Hope it helps!
Why should A chemical equation be balanced?
A. To show that the reactants are compounds
B. To show metals from nonmetals
C. To show ionic compounds
D. To show the law of conservation of mass
Please answer. No links please!!!
