Select the option in which heat evolved is maximum- Given - - fH-CO2-g- -75 kCal-mol - - fH-CO-g- -25 kCal-mol-The product will be CO if excess amount of carbon is present and CO2 if excess O2 is present-

The correct option is C 4 moles of carbon and 3.5 moles of O_2 #160;Given : Δ _fH^∘(CO_2,g)= 75 kCal/mol ; #160; Δ _fH^∘(CO,g) ...

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Standard XII

Chemistry

Derivation of Kp and Kc

Select the op...

Question

Select the option in which heat evolved is maximum.
Given : $Δ_{f} H^{\circ} (C O_{2}, g) = - 75 k C a l / m o l$ , $Δ_{f} H^{\circ} (C O, g) = - 25 k C a l / m o l$ ;
The product will be $C O$ if excess amount of carbon is present and $C O_{2}$ if excess $O_{2}$ is present.

10

moles of carbon and

4.5

moles of

O_{2}

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24

gm of carbon and

64

O_{2}

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4

moles of carbon and

3.5

moles of

O_{2}

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30

gm of carbon and

80

gm of

O_{2}

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Solution

The correct option is C $4$ moles of carbon and $3.5$ moles of $O_{2}$
Given : $Δ_{f} H^{\circ} (C O_{2}, g) = - 75 k C a l / m o l$ ; $Δ_{f} H^{\circ} (C O, g) = - 25 k C a l / m o l$ ;
$C + O_{2} \to C O_{2}$

1 mole 1 mole 1 mole
$C + (1 / 2) O_{2} \to C O$
1 mole 0.5 mole 1 mole
(A) 9 mole of CO forms and heat evolved is $9 \times 25 = 225 k C a l / m o l e$
(B) 2 mole of $C O_{2}$ forms and heat evolved is $2 \times 75 = 150 k C a l / m o l e$ .
(C) one mole of CO and 3 moles of $C O_{2}$ forms and heat evolved is $= 3 \times 75 + 0.5 \times 25 = 237.5 k C a l / m o l e$
(D) 2.5 moles of $C O_{2}$ forms and heat evolved is $2.5 \times 75 = 187.5 k C a l / m o l e$

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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.

Select the option in which heat evolved is maximum.
Given : $Δ_{f} H^{\circ} (C O_{2}, g) = - 75 k C a l / m o l$ , $Δ_{f} H^{\circ} (C O, g) = - 25 k C a l / m o l$ ;
The product will be $C O$ if excess amount of carbon is present and $C O_{2}$ if excess $O_{2}$ is present.