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6. what does the symbol ah stand for? o one calorie given off by a reaction the specific heat of a substance the heat capacity of a substance the heat of reaction for a chemical reaction
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Which best describes the present-day universe? opaque, expanding very slowly, stars produce heavy elements transparent, expanding at an accelerated rate, stars produce heavy elements opaque, expanding at an accelerated rate, stars produce only hydrogen and helium transparent, expanding very slowly, stars produce only hydrogen and helium
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Given that H2 (g) + F2 (g) ⟶ 2HF (g) ΔH ∘ rxn = − 546.6 kJ 2H2 (g) + O2 (g) ⟶ 2H2O (l) ΔH∘rxn = − 57...
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