Question: how to calculate empirical formula of propane?
Answer: Divide the amount of H2O (given in problem) by the molar mass of H2O (given in previous step) 1.442÷18.01528=0.0800431634. Since there are 2 atoms of H in the water molecule (H2O), multiply the molar mass of H2O by 2 in order to get the molar mass of H in propane. The molar mass of H in propane is 0.1600863267.