Question

A gas expands by 2.1 litres against an external
pressure of 105 N/m2, then what will be the work
done by gas?
A) 2.1 × 10^5 J
B) 210 J
C) 8820 J
D) 50 J

Answer 1

Given :

• Volume of Gas (V) = 2.1 liters
• Pressure (P) = 10^5 N/m²

To Find :

• Work done by gas

Solution :

First convert the Volume from litres to m³, which is SI unit,

As we know that,

⇒ 1 litre = 0.001 m³

So,

⇒ Volume = 0.0021

⇒Volume = 2.1 × 10^-3 m²

As we know that,

➠ W = PV

⇒W = 10^5 × 2.1 × 10^-3

⇒W = 2.1 × 10^(5 - 3)

⇒W = 2.1 × 10^2

⇒W = 210

$\therefore$ Work done is 210 J