50 mL of hydrogen gas is mixed with 20 mL of oxygen gas and the mixture is sparked. After the reaction the water formed is a liquid. The volume of gas left at the same temperature and pressure is
$2 H_{2}$ (g) + $O_{2}$ (g) $⟶$ $2 H_{2} O$ (ℓ)

Question

50 mL of hydrogen gas is mixed with 20 mL of oxygen gas and the mixture is sparked. After the reaction the water formed is a liquid. The volume of gas left at the same temperature and pressure is

$2 H_{2}$ (g) + $O_{2}$ (g) $⟶$ $2 H_{2} O$ (ℓ)

TestHub · Accepted Answer

2 volumes of H 2 ​ react with 1 volume of O 2 ​ , and the liquid water takes up negligible volume. 20 mL O 2 ​ needs 40 mL H 2 ​ , leaving 50 - 40 = 10 mL H 2 ​ . Final gas volume = 10 mL. Answer: (A).

Chemistry - Ideal Gas Question with Solution | TestHub

Options:

Doubts & Discussion