Without looking up any numerical data or doing calculations, predict whether the following enthalpy changes should be positive, negative, or zero (a) H f for H 2 (g) (b) H f for O(g) (c) H fusion for H 2 O (d) H combustion for C 3 H 8 (g) Temperature Temperature Heat supplied Heat supplied Temperature Temperature (d) Heat supplied Heat supplied

Question: Without looking up any numerical data or doing calculations, predict whether the following enthalpy changes should be positive, negative, or zero. (a) H f

Without looking up any numerical data or doing calculations, predict whether the following enthalpy changes should be positive, negative, or zero.
(a) ΔH_f^° for H₂(g)
(b) ΔH_f^° for O(g)
(c) ΔH_fusion for H₂O
(d) ΔH_combustion for C₃H₈(g)

Temperature Temperature Heat supplied Heat supplied Temperature Temperature (d) Heat supplied Heat supplied

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