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Given (A) 2CO (g) + O 2 (g)  2CO 2 (g)  0 1 H = –x kJ mol –1 (B) C(graphite) + O 2 (g)  CO 2 (g)  0 2 H = – y kJ mol –1 The  H  for the reaction C (graphite) + 2 1 O 2 (g)  CO (g) is

1. 2 y x 2 
2. 2 y 2 x 
3. 2 y 2 x 
4. 2y – x

Correct answer: 2 y 2 x 

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