Which of the following reactions is endothermic?

H2 (g) + ½O2 (g) → H2O (g), ΔH = - 57.82 kcal

½N2 (g) + O2 (g) + 8.1 kcal → NO2 (g)

½N2 (g) + 3/2H2 (g) → NH3 (g) + 11.0 kcal

C (diamond) + O2 (g) → CO2, ΔH = - 94.50 kcal

Question

Chemistry

Danica Wilkins

24 August, 11:43

Which of the following reactions is endothermic?

H2 (g) + ½O2 (g) → H2O (g), ΔH = - 57.82 kcal

½N2 (g) + O2 (g) + 8.1 kcal → NO2 (g)

½N2 (g) + 3/2H2 (g) → NH3 (g) + 11.0 kcal

C (diamond) + O2 (g) → CO2, ΔH = - 94.50 kcal

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Answers (1)

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Sloane Mccullough · Answer 1

An exothermic reaction releases heat having a negative gross heat of reaction. The endothermic reaction, on the other hand, has a positive gross heat of reaction. Among the choices, the endothermic reaction is the third reaction having a positive heat of reaction.

Which of the following reactions is endothermic?H2 (g) + ½O2 (g) → H2O (g), ΔH = - 57.82 kcal½N2 (g) + O2 (g) + 8.1 kcal → NO2 (g)½N2 (g) + 3/2H2 (g) → NH3 (g) + 11.0 kcalC (diamond) + O2 (g) → CO2, ΔH = - 94.50 kcal

Which of the following reactions is endothermic?

H2 (g) + ½O2 (g) → H2O (g), ΔH = - 57.82 kcal

½N2 (g) + O2 (g) + 8.1 kcal → NO2 (g)

½N2 (g) + 3/2H2 (g) → NH3 (g) + 11.0 kcal

C (diamond) + O2 (g) → CO2, ΔH = - 94.50 kcal