The Mole Review

Front

What is the molar mass of HCl?

Back

36.46 grams per mole of HCl.

Front

What is the molecular formula for glycerol with a molar mass of 92.09g/mol and percent composition of 39.12% C, 8.75% H, and 51.12% O?

Back

C3H8O3.

Front

Which compounds have the same empirical formula: NaCrO4 and Na2Cr2O7, or C2H4O2 and C6H12O6?

Back

C2H4O2 and C6H12O6.

Front

How many moles of baking soda (NaHCO3) are needed for 6 g?

Back

0.071 mol.

Front

How many atoms are in a mole of iodine?

Back

6.02 x 10^23.

Front

Define molar mass.

Back

The mass of one mole of a substance, typically expressed in grams per mole.

Front

What is Avogadro's number?

Back

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

Front

What is the difference between molecular formula and empirical formula?

Back

The molecular formula shows the actual number of atoms, while the empirical formula shows the simplest whole-number ratio of atoms.

Front

How do you calculate the percent composition of a compound?

Back

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

Front

What is the empirical formula for C6H12O6?

Back

C1H2O1 or CH2O.