The volume occupied by $4.75 g$ of acetylene gas at $50°C$ and $740 mmHg$ pressure is L. (Rounded off to the nearest integer)

 

Given, Temperature = $50°C=273.15+50=323.15K$

Pressure of Hg = 740 mm

Weight of acetylene gas = 4.74 g

Volume V=$\frac{nRT}{P}$

n= moles

R = constant

P = pressure

T = temperature in kelvin

n= 4.75 / 26

$V=\frac{4.75}{26}\times \frac{0.0821\times 323.15}{740}\times 760$

V = 4.97 = 5

Therefore, volume occupied by acetylene gas is 5 L.