Question

For which one of the following reactions will the enthalpy change be approximately equal to the...

For which one of the following reactions will the enthalpy change be approximately equal to the internal energy change ?

2 H2(g) + O2(g) → 2 H2O(ℓ)

H2O(ℓ) → H2O(g)

CaCO3(s) → CaO(s) + CO2(g)

H2(g) + Br2(g) → 2 HBr(aq)

CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g)

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