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heat evolved during combustion of hydrogen with oxygen

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The combustion of hydrogen-oxygen mixtures is used to produce very high temperatures (about 2500 degrees Celsius) needed for certain types of welding. Consider the combustion reaction to be that shown below:
H2 (g) + 1/2 O2 (g) ----> H2O (g)
Change in Heat (Delta H) = -241.8 kJ

How much heat is evolved when a 100.0 g mixture containing 18.5% H2 (g), by mass, is burned? (in kJ)

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The solution shows detailed calculation of heat generated in the combustion of hydrogen with oxygen.

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18.5% of H2 in 100 grams of mixture is 18.5 grams.
the moles of H2 is 18.5 / 2 = 9.25 mol.

there are 100 - 18.5 = 81.5 grams O2 in the ...

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