13. In which of the following AH = AU?
(1) N2(g) + 3H2(g) + 2NH3(g)
(3) PCIg(9) — PC13(g) + Cl2(g)
(2) C(s) + O2(9) —— CO2(g)
(4) Cacoz(s) —— CaO(s) + CO2(g)
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2. Will be correct answers
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