Answer to Question #91272 in General Chemistry for Nicole Hedegard

Question #91272
How many Kilojoules are released when 4.00 moles of H2O2 reacts?
2H2O2 --> 2H2O + O2 + 196 KJ
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Expert's answer
2019-07-01T03:54:40-0400

The equivalence of this reaction is:


"2 moles \\space of \\space H_2O_2 \\leftrightarrow 2 moles \\space of H_2O \\leftrightarrow 1 mole \\space of \\space O_2 \\leftrightarrow -196 KJ"


To determine the energy changed thermochemical equation is used:


"4 moles \\space of \\space H_2O_2 \\cdot \\frac {-196 KJ}{2 moles \\space of \\space H_2O_2} = -392 \\space KJ"


Answer: the reaction gives off -392 KJ of heat.


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