1.

Given: 2C_((s)) + 2O_(2(g)) to 2CO_(2(g)), Delta H_1 =-767 kJ …(i) H_(2(g)) + 1/2 O_(2(g)) to H_2 O_((l)), Delta H_2 =-266 kJ …(ii) C_2 H_(2(g)) + 5/2 O_2 to 2CO_(2(g)) + H_2 O_((l)), Delta H_3 =-1290 kJ ….(iii) Heat of formation of acetylene is _________ .

Answer»

1802 KJ
`-1802`kJ
257 kJ
237 kJ

Answer :C


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