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556g, 17.31 mol, approx 388 l vol at STP

SiH4 density is 556kg/m3, (source airliquide website) which is 556g/l

SiH4 has a molecular weight of 32.12, therefore 556 g is 556/32.12 moles= 17.31 mol

Assuming ideal gas 22.4 l per mol volume at standard temp and pressure we get approxiamte volume of 388 litres

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