Question -
An enclosure of volume V contains a mixture of 8g of oxygen, 14g of nitrogen and 22g of carbon- dioxide at absolute temperature T. The pressure of the mixture of gases is (R is universal gas constant)
Options:
A .  RTV
B .  3RT2V
C .  5RT4V
D .  7RT5V
Answer: Option C : C The pressure exerted by a gas is given by P=nRTV = massmolecularweight×RTV Pressure exerted by oxygen P1=832RTV=14RTV Pressure exerted by oxygen P2=1428RTV=12RTV Pressure exerted by carbon dioxide P3=2244RTV=12RTV From Dalton's law of partial pressures, the total pressure exerted by the mixture is given by P=P1+P2+P3 =14RTV+12RTV+12RTV = 5RT4V, which is choice (c)
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