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112 cm^(3) at S.T.P. of a gaseous fluori...

112 `cm^(3)` at S.T.P. of a gaseous fluoride of phosphorus has a mass of 0.63 g calculate the relative molecular mass of fluoride. If the molecule of the fluoride contains only one atom of phosphorus, determine the formula of the phosphorus fluoride. [F = 19, P = 31]

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`(PF_(5)`
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