Question

In enthalpies of formation for c2h4(g) and h2o(i) at 25'c and 1 atm pressure are 52,_394 and _286 kj/mol respectively, then enthalpy of combustion of c2h4(g) will be

Answer 1

Answer:

the chemical reaction is

Explanation:C2H4+3O2 GIVES 2CO2+2H20

THEN THE ENTHALPY OF COMBUSTION IS ENTHALPY OF FORMATION OF PRODUCTS-REACTANTS =[(2x-394)+(2x-286)]-[(52+0)]=-[788-572]-52=-1412kj/mol