Question on: JAMB Chemistry - 2017
If 100cm3 of oxygen pass through a porous plug is 50 seconds, the time taken for the same volume of hydrogen to pass through the same porous plug is? [O = 16, H = 1]
A
10.0s
B
12.5s
C
17.7s
D
32.0s
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Correct Option: B
Rate of diffusion (\frac{\alpha_1}{Density}) or (\frac{1}{\sqrt{Mm}})
Rate = (\frac{1}{time})
(\frac{1}{time}) (\frac{\alpha_1}{Density}) or (\frac{1}{\sqrt{Molarmass}})
Time (\alpha \sqrt{Density}) or (\sqrt{Molarmass})
At constant volume of 100cm3
(\frac{t_{o2}}{\sqrt{Mn_{o2}}}) = (\frac{t_{n2}}{\sqrt{1 \times 2}})
(\frac{50}{4 \sqrt{2}}) = (\frac{t_{n2}}{\sqrt{2}})
tn2= 12.5s
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