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Average molar mass of mixtures, vapour density
JEE Main level
Single correct option
Difficulty 2 of 3
mc095
A mixture contains
3.2
g
of
O
X
2
(
32
g/mol
) and
5.6
g
of
N
X
2
(
28
g/mol
). The average molar mass is
A
30.00
g/mol
B
30.55
g/mol
C
4.40
g/mol
D
29.33
g/mol
Answer: D
Moles:
O
X
2
= 0.1,
N
X
2
= 0.2; total 0.3 mol. Total mass = 8.8 g. Average molar mass = 8.8/0.3 = 29.33 g/mol.
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