What would be the volume of the vapour at STP?

how would i calculate the volume of a vapour at STP? and how would i calculate the desity of the vapour in grams per litre at STP? here is the information i have: mass of condensed liquid: 0.81g temp: 100.3 C barometrc pressure: 101.7kPa volume of flask: 0.140 mass of flask+foil: 91.69g mass of... show more how would i calculate the volume of a vapour at STP? and how would i calculate the desity of the vapour in grams per litre at STP?
here is the information i have:
mass of condensed liquid: 0.81g
temp: 100.3 C
barometrc pressure: 101.7kPa
volume of flask: 0.140
mass of flask+foil: 91.69g
mass of flask+foil+condensed liquid: 92.5g
plz show me how to do this=(
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