Problem Answer

The heat produced by the combustion of the 2.00 moles of hydrogen sulfide represented in the equation is 268 kilocalories.


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Calculate Stoichiometry Expression

Calculating a Heat of Reaction


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Problem


The following incomplete balanced thermochemical chemical equation represents the combustion of hydrogen sulfide (H2S):


2 H2S + 3 O2 ---> 2 SO2 + 2 H2O     Q = - ? kcal


In this equation, all substances are at standard state conditions. Calorimetric data indicates that the complete combustion of 13.5 grams of hydrogen sulfide by this reaction releases 53.0 kilocalories. According to this data, what Q value should be used to complete the above themochemical equation? Atomic Masses: H=1.00 S=32.1 O=16.0 amu

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