Empirical Formula and Percent Composition Quiz

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What does percent composition indicate?

A

Total mass of compound

B

Mass percentage of each element

How do you calculate percent composition?

A

(total mass/mass of element) x 100

B

(mass of element/total mass) x 100

What is the empirical formula of C6H12O6?

A

CH2O

B

C6H12O6

What is needed for empirical formula calculation?

A

Volume of the compound

B

Masses of each element

Which element is represented by O?

A

Oxygen

B

Gold

What is the formula for water?

A

H2O2

B

H2O

What do you divide by to find moles?

A

Molar mass

B

Mass percentage

What is the empirical formula of C4H10?

A

C2H5

B

C4H10

What is a common use of empirical formulas?

A

Identifying compounds

B

Measuring temperature

How many grams in 1 mole of water?

A

10 grams

B

18 grams

What is the first step in percent composition?

A

Determine total mass of compound

B

Find boiling point

What is the empirical formula for glucose?

A

C6H12O6

B

CH2O

Which unit is used for mass in formulas?

A

Litres

B

Grams

What does empirical formula represent?

A

Exact number of atoms

B

Simplest whole number ratio

What is the molar mass of carbon?

A

12 g/mol

B

14 g/mol