Calculations of Formula 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!

LiF (lithium fluoride) = gramsCaO (calcium oxide) = grams
CaF2 (calcium fluoride) = gramsNa2S (sodium sulfide) = grams
K2O (potassium oxide) = gramsNaF (sodium fluoride) = grams
MnO2 (manganese(IV) oxide) = gramsNH4OH (ammonium hydroxide) = grams
CaS (calcium sulfide) = gramsCa(NO3)2 (calcium nitrate) = grams
LiNO3 (lithium nitrate) = gramsCaBr2 (calcium bromide) = grams
CrF3 (chromium(III) fluoride) = gramsTm2O3 (thulium(III) oxide) = grams
UF6 (uranium hexafluoride) = gramsCa3N2 (calcium nitride) = grams
(NH4)2CO3 (ammonium carbonate) = gramsNa3P (sodium phosphide) = grams
FeSO4·7H2O (iron(II) sulfate heptahydrate) = grams