What is ΔH for the decomposition of 9.74 g of HBr(g) (M = 80.91 g mol-1)...

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Question

What is ΔH for the decomposition of 9.74 g of HBr(g) (M = 80.91 g mol^-1) into its elements?

H₂(g) + Br₂(g) ➔ 2 HBr(g) ΔH = -72.8 kJ mol^-1

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