Mole calculations & stoichiometry

Front

What is the formula to calculate the number of moles from mass?

Back

Divide the given mass by the molar mass of the element or molecule.

Front

How many moles are in 98.3 grams of aluminum hydroxide, Al(OH)3?

Back

1.26 moles aluminum hydroxide.

Front

In the reaction 2 Ca + O2 —> 2 CaO, how many moles of CaO are produced from 0.76 moles of O2?

Back

1.52 moles 2 CaO.

Front

What is the molar mass of H2O?

Back

18.015g/mol.

Front

How many particles are in 1 mole?

Back

6.02x10^23.

Front

What is stoichiometry?

Back

The calculation of reactants and products in chemical reactions.

Front

Define molar mass.

Back

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

Front

What is Avogadro's number?

Back

6.02 x 10^23, the number of particles in one mole of a substance.

Front

How do you convert grams to moles?

Back

Use the formula: Moles = Mass (g) / Molar Mass (g/mol).

Front

What is the significance of the coefficients in a balanced chemical equation?

Back

They indicate the ratio of moles of reactants and products.