Select the option in which heat evolved is maximum.
Given : ΔfH∘(CO2,g)=−75kCal/mol , ΔfH∘(CO,g)=−25kCal/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
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
24 gm of carbon and 64 gm O2
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
4 moles of carbon and 3.5 moles of O2
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
30 gm of carbon and 80 gm of O2
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution
The correct option is C4 moles of carbon and 3.5 moles of O2 Given : ΔfH∘(CO2,g)=−75kCal/mol ; ΔfH∘(CO,g)=−25kCal/mol; C+O2→CO2
1 mole
1 mole
1 mole
C+(1/2)O2→CO
1 mole
0.5 mole
1 mole
(A) 9 mole of CO forms and heat evolved is 9×25=225kCal/mole (B) 2 mole of CO2 forms and heat evolved is 2×75=150kCal/mole. (C) one mole of CO and 3 moles of CO2 forms and heat evolved is =3×75+0.5×25=237.5kCal/mole (D) 2.5 moles of CO2 forms and heat evolved is 2.5×75=187.5kCal/mole