Calculate the heat required to make 6.4 kg of C a C 2 from CaO(s) and C(s) from the reaction C a O ( s ) + 3 C ( s ) → C a C 2 ( s ) C O ( g ) give that, Δ H f o ( C a O ) = - 151.6 kcal, Δ H f o ( C

Question

Calculate the heat required to make 6.4 kg of C a C 2 from CaO(s) and C(s) from the reaction C a O ( s ) + 3 C ( s ) → C a C 2 ( s ) C O ( g ) give that, Δ H f o ( C a O ) = - 151.6 kcal, Δ H f o ( C a C 2 ) = - 14.2 kcal, Δ H f o ( C O ) = - 26.4 kcal

TestHub · Accepted Answer

C a O ( s ) + 3 C ( s ) → C a C 2 ( s ) + C O ( g ) Δ H = Σ H ( P r o d u c t ) - Σ H ( r e a c t a n t ) = [ - 14.2 - ( - 26.4 ) ] - [ - 151.6 ) + 3 × 0 ] = 111 kcal Molecular weight of C a C 2 = 64 64 g C a C 2 = 111 kcal So 6.4 kg C a C 2 = 111 × 6.4 × 1 0 3 64 = 1.11 × 1 0 4 kcal.

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