What mass of sulfur has to burn to produce 4.5L SO2 at 300°C and 101 kPa in the following reaction?

S(s) + O2(g) -> SO2(g)

A. 3.07 g S
B. 41.0 g S
C. 13.5 g S
D. 68.8 g S

2 answers

You can't add these up? Look on your periodic table and add the atomic masses. S + O2 ==> SO2
How many mols SO2 do you want? Use PV = nRT and solve for n.

Using the coefficients in the balanced equation, convert mols SO2 to mols S, then grams S = mols S x molar mass S.
Sorry, I answered one question twice. Ignore the first part.