Unit 6 Flashcard Review Regents

Front

How many moles are in 19.82 g Mg?

Back

0.8156 mol Mg

Front

How many moles are in 6.022 x 10^23 molecules of H2O?

Back

1 mole

Front

What is the mass of 1 mole of PbO2?

Back

239 g/mol

Front

How is moles abbreviated?

Back

mol

Front

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

Back

49%

Front

What is the definition of a mole in chemistry?

Back

A mole is a unit that measures the amount of substance, defined as exactly 6.022 x 10^23 particles (atoms, molecules, etc.).

Front

What is the formula to calculate the number of moles?

Back

Number of moles = mass (g) / molar mass (g/mol).

Front

What is the molar mass of water (H2O)?

Back

18 g/mol.

Front

How do you calculate percent composition?

Back

Percent composition = (mass of element in 1 mole of compound / molar mass of compound) x 100.

Front

What is the molar mass of calcium fluoride (CaF2)?

Back

78 g/mol.