What mass of sulfur must be used to produce 12.6L of sulfur dioxide (SO2) at STP?

S8 + O2  SO2

2 answers

moles SO2=12.6/24.0 moles

mass S8=molemassS8*12.6/24
OOOPs, you didn't balance the equation.

S8 +8 O2 >>> 8SO2

moles SO2=12.6/24
moles S8= 1/8*12.6/24

grams S8= moles S8*molmassS8