Free Printable Compound Composition

Worksheets

Compound Composition

Total questions: 24

Worksheet time: 1hrs 18mins

Name

Class

Date

How many Oxygen are in H₂O?

How many elements are in C₆H₁₂O₆?

How many atoms are there TOTAL in:
H₂SO₄

Number of N in (NH₄)₂CrO₄

How many atoms of Hydrogen are in this compound

How many O's are in Al₂(SO₄)₃

What is the molar mass of PbSO₄

303.3 g/mol

294.7g/mol

163.8g/mol

372g/mol

Fluorine is diatomic. What is the molar mass of fluorine gas?

18.998 g/mol

37.996 g/mol

9 g/mol

18 g/mol

*Find the percent composition of N₂S₂.

N: 69.6% S: 30.4%

N:36% S: 75.6%

N: 96.6% S: 3.4%

N: 30.4% S: 69.6%

10.

*Find the percent composition of Cu in CuBr₂ .

28.45%

32.85%

17.78%

68.10%

11.

One molecule of chlorine (Cl₂) weighs

17 amu

71 amu

34 amu

35.5 g

71 g

12.

Find the percent composition of Cu₂S?

%Cu= 67.987 %S= 32.013

%Cu= 79.854 %S= 20.145

%Cu= 35.946 %S= 64.054

13.

Which expression below show the correct method of determining the percent composition of Sodium in Na₂CO₃?

%Na = (22.99g/106g) x 100

%Na = (22.99g/106) / 100

%Na = (45.98g/106g) x 100

%Na = (106/45.98g) x 100

14.

Carbon monoxide, a deadly gas, has a chemical formula of CO (one carbon atom with one oxygen atom). If you look at the total atomic mass of CO, does carbon or oxygen make up more of the mass?

carbon

oxygen

they are exactly the same

it is impossible to tell

15.

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

29%

43%

57%

73%

16.

Magnesium bromide (one magnesium atom with two bromine atoms) has a chemical formula of MgBr₂. If you look at the total atomic mass of MgBr₂, does magnesium or bromine make up more of the mass?

bromine

magnesium

they are exactly the same

it is impossible to tell

17.

What percentage of the total atomic mass of lithium phosphide (Li₃P) is composed of lithium? Hint - consider all three atoms of lithium in your calculation.

13%

29%

40%

60%

18.

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%

19.

What is the percent by mass of oxygen in MgO?

20%

40%

50%

60%

20.

What is the percent by mass of magnesium in MgO?

20%

40%

50%

60%

21.

What is the percent by mass of fluorine in CaF₂(gram-formula mass = 78 g/mol)?

24%

49%

51%

65%

22.

What is the percent by mass of calcium in CaF₂(gram-formula mass = 78 g/mol)?

24%

49%

51%

65%

23.

What is the percent composition by mass of sulfur in the compound MgSO₄ (gram formula mass = 120 g/mol)?

20%

27%

46%

53%

24.

Carbon monoxide, a deadly gas, has a chemical formula of CO (one carbon atom with one oxygen atom). If you look at the total atomic mass of CO, does carbon or oxygen make up more of the mass?

carbon

oxygen

they are exactly the same

it is impossible to tell

Reset

Compound Composition

Total questions: 24

Worksheet time: 1hrs 18mins

Similar Resources on Wayground