Moles to Grams Calculations

A mole is a measurement similar to a dozen (12) EXCEPT much larger. 6 A mole is a measurement similar to a dozen (12) EXCEPT much larger. 6.022 X 1023 units. Now we want to find out how much several moles will weigh.

Quick review: What is the molar mass of 1 mole of H2O? H2O = 18.02 g/mol

So to determine the mass of a substance we can multiply the number of moles by the molar mass.

Let’s say we have 2 moles of H2O. What is the mass? H2O = 18.02 g/mol Grams = moles X molar mass (2 mol)(18.02 g/mol) = 36.04 g

What is the mass of 2.5 moles of H2O? H2O = 18.02 g/mol Grams = moles X molar mass (2.5 mol)(18.02 g/mol) = 45.05 g

What is the mass of 4.25 moles of CO2 ? CO2 = 44.01 g/mol Grams = moles X molar mass (4.25 mol)(44.01 g/mol) = 187.04 g

Oh yeah… What is the name of CO2? Carbon Dioxide

Grams = moles X molar mass (0.5 mol)(18.02 g/mol) = 9.01 g We can also calculate a fraction of a mole the same way. What is the mass of 0.5 moles of H2O? H = (2)(1.01) = 2.02 O = (1)(16) = 16 H2O = 18.02 g/mol Grams = moles X molar mass (0.5 mol)(18.02 g/mol) = 9.01 g

What is the mass of 0.25 moles of NaCl? NaCl = 58.44 g/mol Grams = moles X molar mass (0.25 mol)(58.44 g/mol) = 58.69 g

What is the mass of 0.01 moles of SnF2? SnF2 = 156.71 g/mol Grams = moles X molar mass (0.01 mol)(156.71 g/mol) = 1.57 g