Which gas effuses faster: hydrogen or chlorine? How much faster?
Hydrogen effuses about 5.9 times as fast as chlorine.
Graham's law of effusion states that the rates of effusion of two different gases vary INVERSELY as the SQUARE roots of the mass of their particles.
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In this problem, we can say
Chlorine gas has
Hydrogen gas has
Hydrogen effuses approximately 6 times as fast as chlorine.