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How many times greater is the rate of effusion of oxygen gas than that of carbon dioxide gas at the same temperature and pressure?

(carbon atomic mass = 12.011; oxygen atomic mass = 15.999)

a. 2.173
b. 1.375
c. 6.633
d. 1.173

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The rate of effusion is inversely proportionate to the square root of the density of the gas and normally it's in the ratio of 1.2. We have to find the square root of (12.011/15.999) = 1.173

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