35 cm3 of hydrogen was sparked with 12 cm3 of oxygen at 1...
35 cm3 of hydrogen was sparked with 12 cm3 of oxygen at 110°C and 760mm Hg to produce steam. What percentage of the total volume of gas left after the reaction is hydrogen?
11%
31%
35%
69%
Correct answer is B
Reaction for the equation:
2H2+O2→2H2O
2vol:1vol:2vol
Hence, 2 volumes of Hydrogen is needed for the reaction with Oxygen to produce steam (water).
∴
\text{Excess of Hydrogen} : 35 cm^{3} - 24 cm^{3} = 11 cm^{3}
\text{% Hydrogen left after the reaction} = \frac{11}{35} \times 100% = \frac{220}{7} = 31.48%
\approxeq 31%