Problem: Which of O2 (g), O2 (ℓ), H2 (g), H2 (ℓ), H2O (g), H2O (ℓ) have a heat of formation equal to zero? 1. O2(g), O2(ℓ), H2(g), H2(ℓ) 2. O2(g), H2(g) 3. O2(g), O2(ℓ), H2(g), H2(ℓ), H2O(g), H2O(ℓ) 4. All of them, but only at absolute zero 5. O2(g), H2(g), H2O(g)

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Problem Details

Which of

O2 (g), O2 (ℓ), H2 (g), H2 (ℓ), H2O (g), H2O (ℓ)

have a heat of formation equal to zero?


1. O2(g), O2(ℓ), H2(g), H2(ℓ)
2. O2(g), H2(g)
3. O2(g), O2(ℓ), H2(g), H2(ℓ), H2O(g), H2O(ℓ)
4. All of them, but only at absolute zero
5. O2(g), H2(g), H2O(g)

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