what mass of hydrogen is consumed when 587.9 KJ of energy is evolved from the co

Question

what mass of hydrogen is consumed when 587.9 KJ of energy is evolved from the combustion of a mixture of H2O and O2? the reaction is: H2+ 0.5 O2 ---> H2O where delta H is negative 285.8 KJ what mass of hydrogen is consumed when 587.9 KJ of energy is evolved from the combustion of a mixture of H2O and O2? the reaction is: H2+ 0.5 O2 ---> H2O where delta H is negative 285.8 KJ what mass of hydrogen is consumed when 587.9 KJ of energy is evolved from the combustion of a mixture of H2O and O2? the reaction is: H2+ 0.5 O2 ---> H2O where delta H is negative 285.8 KJ

Explanation / Answer

H2+ 0.5 O2 ---> H2O delta H of the reaction = 285.8KJ

So this delta H is due to one mole of H2

SInce 587.9KJ is evolved that will be due to = 587.9/285.8 KJ/mol = 2.057 moles

Now as we need the mass of H2 = 2.057 * 2 = 4.114 grams of H2 is consumed

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