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Q.

For the reaction: CO(g)+12O2( g)→CO2( g);ΔH°=-67650cal at 25°CCalculate ΔH° at 100°C , given that the required molar heat capacities are as follows: Cp(CO,gas)=6.97cal°C;CpCO2,gas=8.47cal/C  ∘;CpO2,gas=7.00cal/C  ∘

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a

-54.6 cal

b

-67650.4 cal

c

-67684.4 cal

d

-67762.5 cal

answer is D.

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Detailed Solution

ΔH1000-=ΔH250C0=Cp2-Cp2ΔT⇒ΔH1000=758.97-6.97-72+ΔH250C0  =(-112.50-67650)cal=-67762.5cal.
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For the reaction: CO(g)+12O2( g)→CO2( g);ΔH°=-67650cal at 25°CCalculate ΔH° at 100°C , given that the required molar heat capacities are as follows: Cp(CO,gas)=6.97cal°C;CpCO2,gas=8.47cal/C  ∘;CpO2,gas=7.00cal/C  ∘