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From the ideal gas law: $P.V=n.R.T$ $n=1.5\ g\div 46.07\ g/mol=0.0326\ mol$ $P=0.0326\ mol×0.082057\ L.atm/mol.K×(250+273)\ K/(251\ cm^3×1\ L/1000\ cm^3)$ $P=5.57\ atm$
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