1.

Using data provided, calculate the multiple bond energy (kJ mol^(-1)) of a C-=C bond in C_(2)H_(2). The energy is ( C-H bond energy=350 kJ "mol"^(-1)) 2C(s)+H_(2)(g) to C_(2)H_(2)(g), DeltaH=225 kJ mol^(-1) 2C(s) to 2 C(g), DeltaH=1410 kJ mol^(-1) H_(2)(g) to 2 H(g), DeltaH=330 kJ mol^(-1)

Answer»

1165
837
865
815

Solution :`1410+330-(2xx350)+X=255`
x is HEAT of FORMATION of C -=C BOND


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