Problem: At one time, a common means of forming small quantities of oxygen gas in the laboratory was to heat KClO3: 2 KClO3(s) → 2 KCl(s) + 3 O2(g), ΔH = –89.4kJFor this reaction, calculate ΔH for the formation of 10.6 g of KCl.

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We are asked to calculate ΔH for the formation of 10.6 g of KCl.


2 KClO3(s) → 2 KCl(s) + 3 O2(g), ΔH = –89.4kJ

Molar mass KCl = 74.55 g/mol


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At one time, a common means of forming small quantities of oxygen gas in the laboratory was to heat KClO3: 2 KClO3(s) → 2 KCl(s) + 3 O2(g), ΔH = –89.4kJ

For this reaction, calculate ΔH for the formation of 10.6 g of KCl.

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