Question

Hydrogen gas is filled in a balloon at 20°C. If temperature is made 40°C, pressure remaining same, what fraction of hydrogen will come out

• A. 0.07
• B. 0.25
• C. 0.5
• D. 0.75

Answer 1

Answer: (A)

0.07

Answer 2

As $V \propto T$ ∴ $\frac{V_{2}}{V_{1}} = \frac{T_{2}}{T_{1}}$ ⇒ $V_{2} = \left( \frac{313}{293} \right)V_{1}$

Fraction of gas comes out $= \frac{V_{2} - V_{1}}{V_{1}} = \frac{\left( \frac{313}{293} \right)V_{1} - V_{1}}{V_{1}} = \frac{20}{293} = 0.07$.