Express each quantity as a mass in grams.

a) 3.70mol of H2O
b) 8.43 x 10^23 molecules of PbO2

1 answer

a) Each mole weighs 18.0 g. Do the numbers

b) That is 8.43/6.023 = 1.400 moles. Multiply that by the molecular weight of PbO2: 207.3 + (2 x 16.0)= ? . The answer will be in grams.