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Final Exam Review

Total questions: 80

Worksheet time: 20hrs 0mins

Name

Class

Date

How many Hydrogen are in 4H₂O?

How many Oxygen are in H₂O?

How many O's are in Al₂(SO₄)₃

How many atoms are there TOTAL in:
H₂SO₄

How many elements are in C₆H₁₂O₆?

Number of N in (NH₄)₂CrO₄

What is the molar mass of Al(NO₃)₃?

62.01 g/mol

88.99 g/mol

151.00 g/mol

213.01 g/mol

What is the molar mass of Al₂O₃?

42.98 g/mol

69.96 g/mol

85.96 g/mol

101.96 g/mol

What is the molar mass of SrS?

87.62 g/mol

119.69 g/mol

151.76 g/mol

32.07 g/mol

10.

What is the molar mass of CuBr₂?

145.23 g/mol

122.54 g/mol

223.35 g/mol

213.54 g/mol

11.

What is the molar mass of NaOH?

40.00 g/mol

50.00 g/mol

60.00 g/mol

70.00 g/mol

12.

What is the molar mass of (NH₄)₂S?

57.18 g/mol

68.17 g/mol

32.07 g/mol

17.04 g/mol

13.

What is the molar mass of H₂?

1.01 g/mol

2.02 g/mol

16.00 g/mol

32.00 g/mol

14.

What is the molar mass of Fel₂?

55.85 g/mol

126.90 g/mol

239.65 g/mol

309.65 g/mol

15.

What is the molar mass of Ca(OH)₂?

58.10 g/mol

73.09 g/mol

74.10 g/mol

114.18 g/mol

16.

What is the molar mass of CO₂?

17.

What percentage of the total atomic mass of carbon monoxide (CO) is composed of carbon?

29%

43%

57%

73%

18.

What percentage of the total atomic mass of carbon monoxide (CO) is composed of oxygen?

29%

43%

57%

73%

19.

What percentage of the total atomic mass of magnesium bromide (MgBr₂) is composed of magnesium?

13%

43%

63%

87%

20.

What percentage of the total atomic mass of magnesium bromide (MgBr₂) is composed of bromine? Hint - consider the mass of both atoms of bromine in your calculation.

13%

43%

63%

87%

21.

Lithium phosphide (three lithium atoms with one phosphorus atom) has a chemical formula of Li₃P. If you look at the total atomic mass of Li₃P, does lithium or phosphorus make up more of the mass?

lithium

phosphorus

they are exactly the same

it is impossible to tell

22.

What percentage of the total atomic mass of lithium phosphide (Li₃P) is composed of phosphorus?

13%

29%

40%

60%

23.

What percentage of the total atomic mass of calcium nitrate (Ca(NO₃)₂) is composed of nitrogen? Hint - another way to think of calcium nitrate is Ca(NO₃)(NO₃).

17%

24%

29%

59%

24.

A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?

Mg₄N₃

MgN₂

Mg₃N₂

MgN

25.

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.

SO2

SO3

SO4

26.

A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?

Mg₄N₃

MgN₂

Mg₃N₂

MgN

27.

Glycerol has a molar mass of 92.09g/mol. Its percent composition is: 39.12% C, 8.75% H, and 51.12% O. What is the molecular formula for glycerol?

C₂H₃O₂

CH₂O

C₂H₄O₂

C₃H₈O₃

28.

2.40 g of an explosive, J, contains 0.473 g of nitrogen. J also contains 33.8% carbon and 1.41% hydrogen by mass. The remainder of J is oxygen.

What is the empirical formula of J?

C₄HNO₂

CH₂N₂O

C₂HNO₂

CHNO

29.

2.40 g of an explosive, J, contains 0.473 g of nitrogen. J also contains 33.8% carbon and 1.41% hydrogen by mass. The remainder of J is oxygen.

What is the empirical formula of J?

C₄HNO₂

CH₂N₂O

C₂HNO₂

CHNO

30.

A compound consists of 72.2% magnesium and 27.8% nitrogen by mass. What is the empirical formula?

Mg₄N₃

MgN₂

Mg₃N₂

MgN

31.

What is the empirical formula if you have 81.82% carbon and 18.18% hydrogen?

C3H8

CH4

C2H2

C4H10

32.

Given the following, determine the empirical formula: 42.07% sodium, 18.89% phosphorus, and 39.04% oxygen.

NaPO₂

Na₂PO₃

Na₃PO₄

Na₃PO₃

33.

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.

SO₂

SO₃

SO₄

34.

What is the molecular formula for a compound with the empirical formula: K₂SO₄and a molecular mass of 696g.

K₂SO₄

K₈SO₁₆

K₈S₄O₈

K₈S₄O₁₆

35.

What is the molecular formula if the empirical formula is CH₂O and the molecular molar mass is 180.18?

CH₂O

C₂H₄O₂

C₄H₈O₄

C₆H₁₂O₆

36.

What is the molecular formula for a compound with the empirical formula: K₂SO₄and a molecular mass of 696g.

K₂SO₄

K₈SO₁₆

K₈S₄O₈

K₈S₄O₁₆

37.

Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.

NaPO2

Na2PO3

Na3PO4

NaPO4

38.

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.

SO2

SO3

SO4

39.

A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?

Mg₄N₃

MgN₂

Mg₃N₂

MgN

40.

Glycerol has a molar mass of 92.09g/mol. Its percent composition is: 39.12% C, 8.75% H, and 51.12% O. What is the molecular formula for glycerol?

C₂H₃O₂

CH₂O

C₂H₄O₂

C₃H₈O₃

41.

Whats the empirical formula of a molecule containing 18.7% of Lithium, 16.3% of Carbon and 65.0% of oxygen?

CO₂Li₃

Li₂CO₃

Li₃CO₂

LiCO₅

42.

What are the units used for Molar Mass

grams

mols

g/mol

mol/g

43.

How many grams are in 1 mole of Mg?

12 grams

24 grams

36 grams

6.022 x 10²³ grams

44.

How many grams are in 3 mol of carbon?

6 grams

12 grams

18 grams

36 grams

45.

How many grams are in 5 mol of lithium

3 grams

15 grams

35 grams

7 grams

46.

How many grams are in 10 mol of fluorine?

19 grams

190 grams

90 grams

9 grams

47.

How many moles of Na contain 1.45 x 10²¹ atoms of Na?

8.73 x 10⁴⁴ moles

8.73 moles

0.00241 moles

2.41 x 10⁴⁴ moles

48.

How many moles are in 4.5 x 10²⁴ atoms of lithium?

2.71 x 10⁴⁸ particles

7.47 moles

7.47 x 10²⁴ atoms

2.71 moles

49.

How many moles there are in 5.68 x 10²⁴ formula units of AlCl₃?

3.42 x 10²⁴ moles

9.44 x 10²⁴ moles

9.44 moles

3.42 moles

50.

How many atoms are in 1 mole of Iodine (I)?

6.022 x 10²³

4.022 x 10²³

6.022 x 10²⁵

4.022 x 10²⁵

51.

How many molecules are there in 31.8 moles of water?

5.28 x 10^-23 molecules

1.91 x 10²⁵ molecules

5.28x 10^-25 molecules

1.91 x 10²³ molecules

52.

How many moles are in 8.30 X 10²³ molecules of H₂O?

1.38 X 10²³ moles H₂O

1.38 moles H₂O

2 moles H₂O

1 mole H₂O

53.

How many moles are in 6.02 x 10²³ molecules of H₂O?

1 mole

2 moles

6.02 moles

602000000000000000000000 moles

54.

How many molecules of sugar (C₆H₁₂O₆) are in a mole?

24 molecules

180 molecules

180 g

6.02 x 10²³molecules

55.

What is the molar mass of table salt (NaCl)?

116.886 g/mol

35.453 g/mol

22.990 g/mol

58.443 g/mol

56.

What is the formula for Boyle's Law?

P₁V₁=P₂V₂

P₁V₁/P₂V₂

P₁V₂=P₂V₁

P₁/V₁=P₂/V₂

57.

A gas occupies 4.98 L at 2.6 atm of pressure. What volume does it occupy at 1.8 atm pressure?

12.9 L

0.72 L

7.2 L

3.44 L

58.

What is the new volume of the gas if the pressure on 350 L of oxygen at 720 mm Hg is decreased to 600 mm Hg?

420 L

29.16 L

4200.0 L

291.6 L

59.

A gas at a volume of 4 liters is at a pressure of 2 atm. The volume is changed to 16 Liters, what must the new pressure be?

2 atm

12 atm

10 atm

0.5 atm

60.

A sample of radon experiences a change in pressure from 578.78 kPa to 931.88 kPa. If its new volume is 36.387 L, what was its original volume in liters?

(a)

61.

A 43.361 L sample of hydrogen gas experiences a change in pressure from 252.68 kPa to 30.35 kPa. What is the resulting volume in liters?

(a)

62.

A 84.402 L sample of Cl2 experiences a change in pressure from 202.56 kPa to 118.9 kPa. What is the resulting volume in liters?

(a)

63.

A sample of helium experiences a change in volume from 38.454 L to 17.845 L. If its new pressure is 825.1 kPa, what was its original pressure in kilopascals?

(a)

64.

A 47.704 L sample of Br2 experiences a change in pressure from 545.16 kPa to 698.74 kPa. What is the resulting volume in liters?

(a)

65.

A 21.151 L sample of NO experiences a change in pressure from 775.81 kPa to 880.99 kPa. What is the resulting volume in liters?

(a)

66.

On the sidelines at the game, a container filled with oxygen for the players has a volume of 0.03 L and a pressure of 4.00 atm. If the pressure of the oxygen gas is reduced to 2.71 atm and the temperature is kept constant, what is the new volume of the oxygen gas?

0.32 L

361 L

0.9 L

0.04 L

67.

For the problem below, what is the value for the final pressure?
A gas with a volume of 4.0 L at 90.0 kPa expands until the pressure drops to 20.0 kPa. What is its new volume if the temperature doesn’t change?

4.0 L

20.0 kPa

90.0 kPa

18.0 L

68.

The volume of an average NFL player is 2.4 L and the pressure is 101.70 kPa during exhalation. If the pressure during inhalation is 101.01 kPa, what is the volume of the lungs of a NFL player during inhalation?

2.38 L

2.4 L

5.1 L

4284 L

69.

For a teammate’s birthday party, Martellus Bennett needs to buy a helium tank to fill up all of the balloons. If the helium must be compressed from an original volume of 27.0 L at 14.7 psi, down to a volume of 3.00 L, what would be the final pressure of the helium?

132.3 psi

1.63 psi

5.51 psi

132.3 L

70.

What is 50 C in Kelvin?

223

323

100

71.

How do you convert Celsius to Kelvin ?

Add 273

Subtract 273

You can't convert those

They are the same thing

72.

A rigid plastic container holds 1.00 L methane gas at 0.9 atm pressure when the temperature is 22.0°C. How much more pressure will the gas exert if the temperature is raised to 44.6°C and volume stays the same?

0.97 atm

1.82 atm

0.97^oC

1.82^oC

73.

A gas is heated from 263K to 298K. The volume is increased from 24.0L to 35.0L. If the original pressure was 1.00 atm, what is the new pressure?

0.78 atm

1.65 atm

1.28 atm

0.61 atm

74.

A weather balloon has a volume of 105L at 0.97 atm when the temperature is 318K. What is the volume at 293K and 1.05 atm?

89.4 L

0.32 L

93.8 L

3.13 L

75.

A gas is heated from 263K to 298K. The volume is increased from 24.0L to 35.0L. If the original pressure was 101.33 kPa, what is the new pressure?

78.7 kPa

167.2 kPa

129.7 kPa

61.8 kPa

76.

A weather balloon has a volume of 105 L at 98.3 kPa when the temperature is 318 K. What is the volume at 293 K and 106.4 kPa?

89.4 L

0.32 L

93.8 L

3.13 L

77.

If I have 5.6 liters of gas in a piston at a pressure of 1.5 atm and compress the gas until its volume is 4.8 L, what will the new pressure inside the piston be?

1.8 atm

3.27 atm

1.8 L

3.27 atm

78.

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

1.29 L

12.36 L

1.29 atm

12.36 atm

79.

What does the unit atmosphere, atm, measure?

Pressure

Temperature

Volume

Moles

80.

What does the unit Kelvin, K, measure?

Pressure

Volume

Mass

Temperature

100 %

Final Exam Review

Total questions: 80

Worksheet time: 20hrs 0mins

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