Chemistry Middle School

How many moles are there in 15. 0 grams of SiO2?

a

0. 170 mol

b 0. 340 mol

c 0. 534 mol

d 0. 250 mol

e 0. 208 mol

Check it

Answers

Answer 1

Answer:

d) 0.250 mol

Explanation:

15.0 grams of sio2 have 1/4 moles.

Answer 2
The answer for the question you have asked is: 0.25

Related Questions

Which statement best describes how energy and matter move in a wave?
A
A wave transports energy without transporting matter.

B
A wave transports matter without transporting energy.

C
Neither energy nor matter is transported by a wave.

Answers

Answer:

A wave e transports energy without transporting matter

Answer:

the answer is A. a wave transpory energy without transporting matter

An ice cube is dropped into a glass of water.

What option describes the flow of thermal energy in this case?

Thermal energy flows from ice to water because ice has less mass, Thermal energy flows from ice to water because ice has a lower temperature, Thermal energy flows from water to ice because water has more mass, or Thermal energy flows from water to ice because water has a higher temperature?

Answers

This is because the water has lower temperature than ice so the high concentrated water’s heat will flow to the the ice and the ice will get heated until both of the water and ice come to same temperature and the ice will melt because of thermal energy.

When the ice cube is dropped into water in the glass, thermal energy flows from water to ice because water has a higher temperature. Hence, option D is correct.

What is heat transfer ?

The heat energy will transfer from higher temperature region to lower temperature region. There are different modes of transferring heat namely conduction, convection and radiation.

Conduction takes place in solids and convection is the heat transfer mode in gases and liquids.  The thermal energy from a hotter substance will transfer into a a colder object until their final temperature becomes equal.

Here, water is having higher temperature and ice is cold. Hence, thermal energy will flows from water to ice. Thus, water temperature increases and ice starts melting by absorbing the temperature.

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Which word names melted rock and minerals found beneath Earth's crust?

A. lava
B. magma
C. rhyolite
D. gabbro

Answers

Magma is the answer
magma is the answer

1. Complete the following Data Table as you conduct the lab

Answer:

Data Table: Mineral Identification

Characteristics

Sample 7

Sample 20

Sample

I

Sample

27

Sample

35

25

Color

Streak

Luster

Hardness

Special

Properties

Mineral Name

(Score for Question 2: _of3 points)

2. Why was it important to examine both the color and the streak of your minerals?

Answers

Answer:

i need pointss m sowwyyyy

Whoever answers first gets brainlist

Answers

Answer:  Equal amount of genetic material and identical

Explanation:

A. equal amount of genetic material and identical

88
Complete the semence with the word element of compour
O is a(n)
and H₂02₂ is a(n)

Answers

Answer: 82 + 62 = h*2 so that would mean 35.

Explanation:

Which term names molten material found below Earth's surface?
A. gabbro
B. magma
C. lava
D. basalt

Answers

Magma is your answer
The answer would be B. Magma !

What are the empirical formula and empirical formula mass for N2S3

Answers

Answer: 1)empirical formula

=> a formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms.

Element   Symbol Entered Percent Actual Percent Moles

Nitrogen     N              22.53%            22.55%               2

Sulphur              s               77.47%            77.45%               3

Explanation:

The empirical formula of a compound is derived from the number of moles of the constituent elements of the compound. The empirical formula of dinitrogentrisulphide is N₂S₃ itself. It formula mass is 124 g.

What is empirical formula ?

The empirical formula of a compound is derived from the number of moles of the constituent elements present in the compound. The number of moles can be determined from the mass percentage if given for each element.

The empirical formula mass is the mass from the number of atoms and atomic masses of elements from the empirical formula

Here, the empirical formula of the given compound is N₂S₃ itself.

Atomic mass of N = 14 g/mol

mass of two nitrogens = 28 g

Atomic mass of sulphur = 32 g/mol

mass of 3 sulphur = 3 × 32 = 96 g

then formula mass of N₂S₃ = 96 g +28 g = 124 g/mol

Therefore, the empirical formula mass of the compound N₂S₃ is 124 g/mol. Where, nitrogen is present in 22.5% and sulphur is present in 77.4%.

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An air mattress is filled with 0. 55 moles of air. The air inside the mattress has a temperature of 295 K and a gauge pressure of 3. 5 kilopascals. What is the volume of the air mattress?

Answers

Answer:

49.3 liters

Explanation:

To determine the volume of the air mattress, we need to know the equation of state of the air inside the mattress. One commonly used equation of state for an ideal gas is the ideal gas law: PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature.

We can rearrange this equation to solve for volume:

V = nRT/P

Using the given values, we have:

V = (0.55 moles)(8.31 J/mol·K)(295 K)/(3500 Pa)

Converting the pressure from kilopascals to pascals:

V = (0.55 moles)(8.31 J/mol·K)(295 K)/(3500 Pa)

V = (0.55 moles)(8.31 J/mol·K)(295 K)/(3500 N/m^2)

V = 0.55 moles * 8.31 J/mol·K * 295 K / 3500 N/m^2

We can now calculate the volume:

V = 49.3 L

So, the volume of the air mattress is approximately 49.3 liters.

Please answer as quick as possible first person to answer gets brainlist

Answers

Equal amount, but with subtle differences
equal amounts with subtle differences
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