Question

Calculate the weight of a substance X which in gaseous form occupies 10 litres at 27 °C and 700 mm pressure. The molecular weight of X is 60.

Answer 1

Convert the volume to STP using the gas equation. 

Initial conditions: P₁ = 700 mm of Hg, V₁ = 10 litres, T₁ = 27 + 273 = 300 K

Final conditions (at STP): P₀ = 760 mm of Hg, V₀ = X litres, T₀ = 273 K