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Q.

For the given reaction,CH4(g)+2O2(g)⟶CO2(g)+2H2O(l)the correct expression for ΔrH is

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a

HmCO2,g+2HmO2,g−2HmH2O,l+HmCH4,g

b

2HmO2,g+HmCH4,g−HmCO2,g+2HmH2O,l

c

HmCO2,g+2HmH2O,l−HmCH4,g+2HmO2,g

d

HmCO2,g+HmH2O,l−HmCH4,g+2HmO2,g

answer is C.

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Detailed Solution

CH4(g)+2O2(g)⟶CO2(g)+2H2O(l)ΔrH=ΣiaiHproducts −ΣibiHreactants =HmCO2,g+2HmH2O,l− HmCH4,g+2HmO2,gwhere, Hm is the molar enthalpy.

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