Test Topics

Mole Conversions

Calculating Molar Mass

% Composition

Empirical and Molecular Formulas

2a.)

%C 40.68

%H 5.08

%O 54.24

2b.)

%H 11.1

%O 88.9

2c.)

%N 21.2

%H 6.06

%S 24.24

%O 48.48

2d.)

%C 71.58

%H 6.67

%N 4.91

%O 16.84

2e.)

%S 47.8%

%Cl 52.2%

2f.)

%Li 14.89%

%S 34.04%

%O 51.06%

8a) CH2O

8b) HO

8c) CO2

10)CaCO3

11) CCl2F2

12) Mg2O

13) Ca3P2

14) Cs2S3

%Cs 73.5%

%S 26.4%

Chp. 10 Review Game

The unit used to measure the number of representative

particles in a substance is…

Mole

The type of representative particles in a molecular

compound are…

molecules

What is the molar mass of NaCl?

58g

What is the mass of one mole of Cu atoms?

64g

How many grams are in 3 moles of NaCl?

174g

How many formula units are in 3 moles of NaCl?

1.8066x1024 formula units

What is the % composition of sodium in NaCl?

39.66%

The lowest whole number ratio of elements in a compound is called the formula.

Empirical Formula

What is the empirical formula of C6H12O6?

CH2O

T or F: The molecular formula is a whole number ratio of its

empirical formula.

True

The type of representative particle in an ionic compound

is…

Formula unit

What is the chemical formula of Barium Sulfate?

BaSO4

What is the molar mass of BaSO4?

233g

How many moles are in 364g of BaSO4?

1.56 moles

How many formula units are in 2 mol of BaSO4?

1.2 x 1024 formula units

What is the % composition of Barium in BaSO4?

59%

What is the empirical formula of a compound containing 40%

Sulfur and 60% Oxygen?

SO3

58 g of Ba react with 40 g of Cl. What is the % composition of

Ba?

59.2%

How many grams are in 6.022 x 1023 atoms of Cu?

64 g

How many grams are 3.46 x 1024 particles of Lithium Cyanide?

189.6g

A compound consists of 94.1% O and 5.9% H. What is the empirical formula of this

compound?

HO

What is the % composition of N when 265 g N combine with

340 g of O?

43%