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80g 18g 98g
SO3 + H20 -> H2SO4
1.6g 100g
100cm^3 wody=100g
80g - 22.4dm^3
xg - 0.448dm^3
x=80gx0.448dm^3/22.4dm^3=1.6g
80g - 98g
1.6g - x
x=1.6gx98g/80g=1.96g