Question

When a certain amount of ethylene was combusted, 6226 kJ heat was evolved. If heat of combustion of ethylene is 1411 kJ, the volume of `O_(2)` (at STP) that entered into the reaction is :
A. 296.5 ml
B. 296.5 litre
C. `6226xx22.4` litre
D. 22.4 litre

Answer 1

Correct Answer - B
`C_(2)H_(4)+3O_(2)rarr 2CO_(2)+2H_(2)O , Delta H=-1411 kJ`
1411 kJ heat is produced by 3 mol `O_(2)` so 6226 kJ heat is produced by -
`(3)/(1411)xx6226xx22.4=296.5` litre.