At STP, 250cm^(3) of a gas weighs 0.7317...

At STP, `250cm^(3)` of a gas weighs 0.7317g. If the density of `H_(2)` gas at STP be 0.08987`g*L^(-1)` then what will be the vapour density of the gas? Determine the molecular mass of the gas.

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