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Average molar mass of mixtures, vapour density
NEET level
Single correct option
Difficulty 1 of 3
mc093
A gas mixture contains
0.5
mol
of
O
X
2
(
32
g/mol
) and
1.5
mol
of
N
X
2
(
28
g/mol
). Its average molar mass is
A
30
g/mol
B
29
g/mol
C
31
g/mol
D
58
g/mol
Answer: B
Average molar mass = total mass / total moles = (0.5 x 32 + 1.5 x 28)/2.0 = 58/2 = 29 g/mol.
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