Conversions (Mass-Mole-Particles) & Percent Comp.

Front

What is the relationship between moles, mass, and particles?

Back

1 mole = 6.02 x 10^23 particles (Avogadro's number); Mass (g) = Moles x Molar Mass (g/mol).

Front

How do you calculate the molar mass of a compound?

Back

Add the atomic masses of all atoms in the compound's formula.

Front

What is the empirical formula?

Back

The simplest whole-number ratio of elements in a compound.

Front

How do you convert grams to moles?

Back

Moles = Mass (g) / Molar Mass (g/mol).

Front

How do you convert moles to particles?

Back

Particles = Moles x 6.02 x 10^23.

Front

What is the formula to calculate percent composition?

Back

Percent Composition = (Mass of Element / Total Mass of Compound) x 100.

Front

What is the molar mass of water (H2O)?

Back

18.02 g/mol.

Front

How many moles are in 56 grams of CO?

Back

Moles = Mass (g) / Molar Mass (g/mol) = 56 g / 28 g/mol = 2 moles.

Front

What is the percent carbon in CO2?

Back

Percent Carbon = (Mass of Carbon / Total Mass of CO2) x 100 = (12.01 g / 44.01 g) x 100 = 27.3%.

Front

How do you find the number of molecules in a given mass of a substance?

Back

Convert mass to moles, then multiply by Avogadro's number.