Question

The number of moles of ${H_2}$ in 0.224 litre of hydrogen gas at STP (273 K, 1 atm) is :

• A. 0.1
• B. 0.01
• C. 0.001
• D. 1

Answer 1

Answer: (B)

0.01

Answer 2

$\because$ 22.4 L of $H_2$ at STP = 1 mole of $H_2$ $\therefore$ 0.224 L of $H_2$ at STP = $\frac{1}{22.4} \times 0.224$ $= 0.01 \, moles .$