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Q3 Review: Molar Relationships & States of Matter

Total questions: 20

Worksheet time: 40mins

Name
Class
Date
1.

How many molecules are in 2.1 moles of CO2?

a)

3. 5 x 10-24

b)

1.26 x 1024

c)

44

d)

92.4

2.

How many moles are in 5.0 L of Ar gas (at STP)

a)

0.22 moles

b)

112 moles

c)

1 mole

d)

0.125

3.

What is the mass in grams of 5.9 mol C8H18?

a)

114.23 grams

b)

674 grams

c)

0.05 grams

d)

1 gram

4.

What is the empirical formula for C3H6?

a)

C2H

b)

CH2

c)

C3H6

d)

CH3

5.

What is the empirical formula for C12H22O11?

a)

CH2O

b)

C12H22O11

c)

C6H11O6

d)

CH3

6.

What is the empirical formula for C2H4Br2?

a)

C2H4Br2

b)

CH2Br

c)

C2HBr2

d)

CHBr

7.

A compound consists of 75% carbon and 25% hydrogen by mass. What is the empirical formula?

a)

C2H4

b)

CH4

c)

CH

d)

C3H6

8.

A 88.0 g sample of a compound consisting of carbon and hydrogen contains 81.2 g of carbon and 6.8 g of hydrogen. What is the empirical formula?

a)

C2H4

b)

CH4

c)

CH

d)

CH2

9.

Using the following equation: Fe2O3 + 3H2 → 2Fe + 3H2O, If 6 moles of H2 reacted, how many moles of iron are produced?

a)

4 moles Fe

b)

3 moles Fe

c)

2 moles Fe

d)

6 moles Fe

10.

C3H8 + 5O2 ​​→ 3CO2 + 4H2O, If 1.00 liter of oxygen gas is used, how many liters of carbon dioxide will be produced at standard temperature and pressure (STP)?

a)

0.6 L

b)

6 L

c)

1 L

d)

0.3 L

11.

Using the following equation: Li3N + 3H2O --> NH3 + 3LiOH. Determine the mass of lithium hydroxide produced when 0.38g of lithium nitride reacts with water.

a)

0.78 g

b)

0.38 g

c)

1.66 g

d)

1 g

12.

According to the kinetic molecular theory, the temperature of a gas depends on the _____________  of the gas particles.

a)

speed

b)

distance

c)

volume

d)

molar mass

13.

A hypothetical gas that perfectly fits all the assumptions of the kinetic molecular theory is known as _____________

a)

an ideal gas

b)

a real gas

c)

a diatomic gas

d)

an inert gas

14.

Which graph represents the relationship between pressure and volume for a sample of an ideal gas at constant temperature?

a)
b)
c)
d)
15.

If the temperature is kept constant and the piston moves down to decrease volume, the pressure increases because the gas particles

a)

Collide with the walls of the cylinder more frequently

b)

Have increased kinetic energy

c)

Occupy a smaller volume

d)

Experience reduced intermolecular forces

16.

Based on the relationship between P and V. If a gas of volume V is place in a balloon. The pressure is reduced to 1/5 of the original pressure. The volume will be _____ what it was originally.  

a)
the same as 
b)
1/5
c)
9 times
d)
5 times
17.

If I initially have 4.0L of a gas and a pressure of 1.1 atm, what will the volume be if I increase the pressure to 3.4 atm?

a)

1.29 L

b)

1.64 L

c)

0.43 L

d)

0.53 L

18.

A water bottle at STP is cooled to -155°C. What is the new pressure?

a)

0.43 atm

b)

0.682 atm

c)

1.568 atm

d)

2.187 atm

19.

Intermolecular forces are forces that exist ________________ two or more _____________________.

a)

between; ions

b)

within; atoms

c)

between; molecules

d)

within; electrons

20.

What explains the physical properties of water such as a very high melting and boiling point?

a)

hydrogen bonding

b)

ion-ion attractions

c)

a high density

d)

a large gram formula mass