Unit 8 Practice Test

Front

What is an empirical formula?

Back

An empirical formula represents the simplest whole-number ratio of the elements in a compound.

Front

How do you calculate the molar mass of a compound?

Back

To calculate the molar mass, sum the atomic masses of all atoms in the molecular formula.

Front

What is the empirical formula of a compound with 40.05% S and 59.95% O?

Back

SO3

Front

How many grams are in 2.40 moles of C6H12?

Back

202 g

Front

What is the molecular formula of Vitamin C?

Back

C6H8O6

Front

How do you determine the number of moles from grams?

Back

Use the formula: moles = mass (g) / molar mass (g/mol).

Front

What is the molar mass of calcium hydroxide, Ca(OH)2?

Back

74.10 g/mole

Front

What is the empirical formula of a compound with 25.92% N and 74.08% O?

Back

N2O5

Front

What is the significance of Vitamin C in the human diet?

Back

Vitamin C is essential for the growth and repair of tissues and is a powerful antioxidant.

Front

How do you convert grams of a substance to moles?

Back

Divide the mass of the substance by its molar mass.