A two litre flask contains 22 grams of carbon dioxide and 1 gm of helium at 20°C. Calculate the partial pressure exerted by Co2, if the total pressure is 3atm
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Partial pressure exerted by Co2 is 2 atm
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The molar masses of carbon dioxide and helium are 44 g/mol and 4 g/mol respectively.
The number of moles is the ratio of mass to molar mass. 22 g of carbon dioxide = 22/44 =0.5 moles.
1 g of helium = 1/4 =0.25 moles.
The mole fraction of carbon dioxide = 0.5+0.25 0.5 =0.667
The partial pressure of a gas is the product of its mole fraction and total pressure.
The partial pressure of carbon dioxide =0.667×3 = 2 atm.
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