Question #197988

Consider the reaction below. How much heat is evolved when 186 g oxygen are reacted with excess hydrogen? 2H2(g)+O2(g)⟶2H2O(g) ΔH=−572 kJ

a. - 106 kJ


b. - 3.32 kJ


c. - 98.4 J


d. - 3400 kJ




1
Expert's answer
2021-05-31T02:05:30-0400

Moles of oxygen in 186 gm O2=18632=5.8125moles=n2O_2 = \dfrac{186}{32}=5.8125 moles=n_2


ΔHgiven=572kJ\Delta H_{given}=- 572 kJ

Now the ΔH\Delta H is given for one mole of oxygen,

For 5.812 moles of oxygen,the net heat evolved : =5.8125×(572)=3324.75kJ=5.8125 \times(-572)=-3324.75kJ


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