Question

10 moles of a mixture of hydrogen and oxygen gases at a pressure of 1 atm at constant volume and temperature, react to form 3.6 g of liquid water. The pressure of the resulting mixture will be closest to

• A. 1.07 atm
• B. 0.97 atm
• C. 1.02 atm
• D. 0.92 atm

Answer 1

The correct option is B

0.97 atm

$2H_2\left(g\right)+O_2\left(g\right)\stackrel{}{\to }2H_{2}O$ (l )

0.2 mole 0.1 mole 0.2 mole

moles of gas remaining = 9.7 at constant (T) & (V)

$\frac{n_1}{n_2}=\frac{p_1}{p_2}$

$\frac{10}{9.7}=\frac{1}{p_2}$ & $p_2=0.97$