Question

What mass of sulfur must be used to pro- duce 14.7 L of gaseous sulfur dioxide at STP according to the following equation?
S8 (s) + 8 O2 (g) −→ 8 SO2 (g) Answer in units of g

Answer 1

Here is a worked example that will solve all of your stoichiometry problems.
http://www.jiskha.com/science/chemistry/stoichiometry.html