Question

One litre of a gas at stp weight 1.16 g it can possible be
(a) C2H2
(b) CO
(c) O2
(d) CH4

Answer 1

At STP
1 litre of gas = 1.16g
22.4L of gas =1.16gm×22.4= 25.98g.m ≈26gm

M.M of C2H2=26gm
M.M of CO =28gm
M.M of O2 = 32gm
M.M of CH4 =16gm

So it is clear that it is ethyne gas.
Option A is correct

Answer 2

Answer: (a) $C_2H_2$

Explanation:

According to Avogadro's law, 1 mole of every gas occupies 22.4 L at STP and weighs equal to its molar mass.

Thus if 1 L of gas weighs= 1.16 g

22.4 L of gas weighs=$\frac{1.16}{1}\times 22.4=26g$

Thus the molar mass of the gas is 26 g.

Molar mass of $C_2H_2$ is 26 g

Molar mass of $CO$ is 28  g

Molar mass of $O_2$ is 32 g

Molar mass of $CH_4$ is 16 g

Thus the gas is $C_2H_2$.