Question

What volume of water can be formed from 2.24L of $O_2$ at on STP reacting with sufficient hydrogen?

• A. 2.24 L
• B. 1.12 L
• C. 1.8 mL
• D. None of these

Answer 1

Answer: (D)

None of these

$STP\Rightarrow P=1atm$

$T=273k$

$V=2.24L$ (given)

$n=\frac{PV}{RT}$

$=\frac{1\times 2.24}{0.082\times 273}\approx 0.1mol$

$H_2+\frac{1}{2}{O}_2\to H_{2}O$

$\therefore 0.1mol$ $O_2$ can give

maximum of $0.2mol{H}_{2}O$

mass $=0.2\times 18=3.69$

$\therefore$ vol=$3.6mol$ (density.$1g/ml$)