How many moles of H₂ are required to produce -3501 kJ of heat in the following...

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How many moles of H₂ are required to produce -3501 kJ of heat in the following reaction? N₂ (g) + 3 H₂ (g) → 2 NH₃ (g) ∆H° = -91.8 kJ/mol

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