Given (A) 2CO(g) + O2(g) 2CO2(g) – – mol kJ x H (B) C(graphite) + O2(g) CO2(g) – – mol kJ y H The H for the reaction C(graphite) + ) ( ) ( 1 g CO g O is (A) 2y x (B) 2y – x (C) 2 y x (D) y x

Question

Given (A) 2CO(g) + O2(g) 2CO2(g) – – mol kJ x H (B) C(graphite) + O2(g) CO2(g) – – mol kJ y H The H for the reaction C(graphite) + ) ( ) ( 1 g CO g O is

(A) 2y x
(B) 2y – x
(C) 2 y x
(D) y x

Prashant Kotian · Accepted Answer

Correct answer: A. From equation (ii) – )i( = target equation C(graphite) + O2(g)   CO2(g) ; H = -y KJ/mol [2CO2(g)   2CO(g) + O2(g)] × 1 ; H = -x KJ/mol × 1 ____________________________________________________________ C (graphite) + 1 O2(g)   CO(g) so H = So H for target equation = – y –       x = – y + x = y x  KJ/mol

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