Question

12. Molecular mass of a gas is 78. Its density at 98°C
and 1 atm will be
(a) 200 g
(b) 2.56 g L-
(c) 256 g L-
(d) 78 g L-​

Answer 1

Answer:

P=1 atm,

T=98

∘

+273=371 K,

M=78 g mol

−1

R=0.0821 L atm K

−1

mol

−1

PM=dRT or

d=

RT

PM

=

0.0821×371

1×78

=2.56 g L

−1

.

Explanation:

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