Chem 1 Unit 9 Review 2024

Front

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

Back

51%

Front

What are the units for molar mass?

Back

grams/mole

Front

What is the molar mass of UF₆?

Back

352 g/mol

Front

What is the percent by mass of chlorine in NaCl?

Back

61%

Front

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

Back

57%

Front

Define molar mass.

Back

The mass of one mole of a substance, typically expressed in grams per mole (g/mol).

Front

How do you calculate percent by mass?

Back

(mass of element in 1 mole of compound / molar mass of compound) x 100%.

Front

What is the molar mass of NaCl?

Back

58.44 g/mol.

Front

What is the formula to find the percent composition of an element in a compound?

Back

(mass of element in 1 mole of compound / molar mass of compound) x 100%.

Front

What is the significance of the gram-formula mass?

Back

It is the mass of one mole of a compound, used to convert between moles and grams.