Calculations of Molar (Molecular) Mass

Determine the mass of each of the following compounds, rounding molar masses of elements to the gram before adding up the total. DO NOT USE A CALCULATOR!

CH4 (methane) = gramsC2H6 (ethane) = grams
C3H8 (propane) = gramsN2O4 (dinitrogen tetroxide) = grams
N2O (nitrous oxide) = gramsCF4 (carbon tetrafluoride) = grams
CS2 (carbon disulfide) = gramsSF6 (sulfur hexafluoride) = grams
C6H12O6 (glucose) = gramsSiO2 (silicon dioxide) = grams
SiF4 (silicon tetrafluoride) = gramsP2O5 (diphosphorus pentoxide) = grams
HCN (hydrogen cyanide) = gramsC2H5OH (ethanol) = grams
SO3 (sulfur trioxide) = gramsNH3 (ammonia) = grams