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Question

Select the option in which heat evolved is maximum.

Given : ΔfH(CO2,g)=75 kCal/mol , ΔfH(CO,g)=25 kCal/mol;
The product will be CO if excess amount of carbon is present and CO2 if excess O2 is present.

A
10 moles of carbon and 4.5 moles of O2
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B
24 gm of carbon and 64 gm O2
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C
4 moles of carbon and 3.5 moles of O2
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D
30 gm of carbon and 80 gm of O2
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Solution

The correct option is C 4 moles of carbon and 3.5 moles of O2
Given : ΔfH(CO2,g)=75 kCal/mol ; ΔfH(CO,g)=25 kCal/mol;
C+O2CO2

1 mole 1 mole1 mole
C+(1/2)O2CO
1 mole 0.5 mole1 mole
(A) 9 mole of CO forms and heat evolved is 9×25=225 kCal/mole
(B) 2 mole of CO2 forms and heat evolved is 2×75=150 kCal/mole.
(C) one mole of CO and 3 moles of CO2 forms and heat evolved is =3×75+0.5×25=237.5 kCal/mole
(D) 2.5 moles of CO2 forms and heat evolved is 2.5×75=187.5 kCal/mole

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