Mycah E.
asked • 12/27/20Hess's Law problem. Please help
The reaction in hand warmers is 4Fe (s) + 3O2 (g) ===> 2Fe2O3 (s) ΔH= -1652 kJ. Calculate the amount on energy released by a hand warmer that contains 1.25 g of Fe (s).
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1 Expert Answer
Mass of Iron needed for reaction: 4 moles Fe*(55.845 g/mol) or 223.38 g Fe
This means that 1652 kJ of heat will be released whenever 223.38 g Fe are used.
Amount of heat released when 1.25 g of Fe are used: 1.25 g Fe*(-1652 kJ/223.38 g Fe) or -9.24 kJ
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J.R. S.
12/27/20