Verified Solution • 2025–26 Session moderate

QAIPMT-2002-Ch-2760: NEET 2002 Chemistry - Class 11 AIPMT-2002-Ch-2760 Solution: Heat of combustion \( H^ \) for C(s), \(H_2(g)\) and…

Heat of combustion ΔH∘\Delta H^\circ for C(s), H2(g)H_2(g) and CH4(g)CH_4(g) are -94, -68 and -213 kcal/mol, then ΔH∘\Delta H^\circ for C(s)+2H2(g)→CH4(g)H_2(g)\rightarrow CH_4(g) is

Multiple Choice Options

  • A −17-17 kcal
  • B −111-111 kcal
  • C −170-170 kcal
  • D −85-85 kcal

Step-by-Step Verified Solution

C (s) + 2H 2(g) _ CH 4(g) , _ H o = ? C (s) + O 2 (g) _ CO 2(g) , _ H = � 94 kcal/mol ....(1) H 2(g) + 1 2 O 2 (g) _ H 2 O (g) , _ H = � 68 kcal/mol ....(2) CH 4 (g) + 2O 2 (g) _ CO 2(g) + H 2 O (l) , _ H = � 213 kcal/mol ....(3) Performing (1) + 2 _ (2) � (3) _ H o = [� 94 � 2(68)] � (�213) kcal/mol = [� 94 � 136] + 213 k cal/mol = � 230 + 213 = � 17 kcal/mol

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