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Q.

A mixture of hydrogen and oxygen has volume 500 cm3, temperature 300K, pressure 400 kPa and mass 0.76 grams. The ratio of masses of oxygen to hydrogen will be__

R=253J/mol/K

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answer is 5.33.

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Detailed Solution

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PV=nRT
400×103×500×10−6=n×8.314×300
n=225, n=n0+nH
225=M032+MH2⇒M0+MH=0.76
∴M0MH=163

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