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The heat of formation \( \left(\Delta H_{f}\right) \) of \( \mathrm{H}_{2} \mathrm{O}(l) \) is equal to:
(A) zero
(B) molar heat of combustion of \( \mathrm{H}_{2}(l) \)
(C) molar heat of combustion of \( \mathrm{H}_{2}(\mathrm{~g}) \)
(D) sum of heat of formation of \( \mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \) and \( \mathrm{O}_{2}(\mathrm{~g}) \)
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