Question

10.
A 11 litre flask contains 20g of neon and an unknown weight of hydrogen. The gas
density is found to be 2g/litre at 0°C. What is the average molecular weight?
(a) 11
(c) 13
(d) 10
(b) 12​

Answer 1

Answer:

A) 11 is the correct option.

Explanation:

Given, Density = 2g/L

and we know that D = mass / Volume

=> Mass = density× Volume

=> Mass of gases = 2×11 = 22g.

Now,

20 g is Neon. => 22-20 = 2g is H

Average molecular weight = Total mass of gases/No. gases

= 22/2

= 11