General Chemistry 1 _Week 3

What does the formula for a compound tell you?

• the number of atoms

• the types of atoms

• the number and types of atoms

• none of the above

The mass of a compound is made of:

• the mass of one or more element

• the mass of water

• larger masses

• smaller masses

Percent composition tells you:

• the percent of the atoms present for each element

• the percent of the molecule

• the percent of the molecules present

• the percent of only one of the elements present

When you are done finding the percent composition, the total percent should equal:

• 10%

• 100%

• 50%

• 75%

A formula that gives the simplest whole number ratio of the atoms of the elements is:

• a molecular formula

• a structural formula

• an empirical formula

• none of the above

If you are given the percent compositions and asked to find the empirical formula, what do you assume?

• 10 g of sample

• 50 g of sample

• 75 g of sample

• 100 g of sample

What is the molar mass of strontium carbonate? Choose the closest answer.

• 99.63 grams

• 146.5 grams

• 147.6 grams

• 187.2 grams

What are the percent composition for SF2?

• 55 % Sulfur and 45% Fluorine

• 45.76% Sulfur and 54.39 % Fluorine

• 33% Sulfur and 67% Fluorine

• 49.2 % Sulfur and 50.8 % Fluorine

What is the empirical formula for a compound that contains 5.28 moles Oxygen, 1.32 moles Sulfur and 2.64 moles Hydrogen

• HSO

• H2SO2

• H2SO4

• HSO2

What is the empirical formula for a compound that contains 37.69% Na and 62.31 % Fluorine?

• NaF3

• Na2F

• NaF

• NaF2