An effusion apparatus can be used to determine molecular weights. In one experim

Question

An effusion apparatus can be used to determine molecular weights. In one experiment the effusion of CHCl3 is detected to be 10.35 min and in a desperate experiment an unknown gas is detected at 6.54 min. What is the molecular weight of the unknown gas?
(1) 740 (2) 48 (3) 119 (4) 135 (5) 258 An effusion apparatus can be used to determine molecular weights. In one experiment the effusion of CHCl3 is detected to be 10.35 min and in a desperate experiment an unknown gas is detected at 6.54 min. What is the molecular weight of the unknown gas?
(1) 740 (2) 48 (3) 119 (4) 135 (5) 258
(1) 740 (2) 48 (3) 119 (4) 135 (5) 258

Explanation / Answer

Molar mass of CHCl3 = 119.4 g/mol
we know t1/t2=m1/m2

m2=(t2/t1)2*m1=(6.54/10.35)2*119.4=48 g/mol

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