60cm3 of hydrogen are sparked with 20cm3 of oxygen at 100°C and 1 atmosphere. The total volume of the residual gases is?
-
60 cm3
- 10 cm3
- 40 cm3
- 30 cm3
- 70 cm3
The correct answer is: A
Explanation
Equation of the reaction
2\(H_2 + O_2 → 2(H_2O_2\))
no of moles: 2 1 → 2
initial volume: 60cm\(^3\) 20cm\(^3\) 0cm\(^3\)
vol used 40cm\(^3\) 20cm\(^3\) -----
after sparking 20cm\(^3\) 0cm\(^3\) 40cm\(^3\)
Therefore, the total volume of residual gases = 20cm\(^3\) left of hydrogen + 40cm\(^3\) of stream produced = 60cm\(^3\)