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Standard XII

Chemistry

Heat of Formation

Bond dissocia...

Question

Bond dissociation energy of $C H_{3} - H$ bond is $103 k c a l m o l^{- 1}$ and heat of formation of $C H_{4} (g)$ as $- 17.88 k c a l m o l^{- 1} .$ The dissociation energy of $H_{2} (g)$ into $H$ atoms is $103 k c a l / m o l .$ The heat of formation of methyl radical is ?

3.61 k c a l m o l^{- 1}

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- 3.61 k c a l m o l^{- 1}

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33.61 k c a l m o l^{- 1}

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- 33.61 k c a l m o l^{- 1}

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Solution

The correct option is C $33.61 k c a l m o l^{- 1}$
Given-
$B E_{C H_{3} - H} = 103 k c a l m o l^{- 1}$ &
$Δ H_{f} = - 17.88 k c a l m o l^{- 1}$

The required reaction is,
$C H_{4} (g) \to C H_{3} (g) + H (a t o m, g)$

$= △ H_{f} (C H_{3}, g) + △ H_{f} (H a t o m, g) - △ H_{f} (C H_{4}, g)$
$(△ H_{f})_{C H_{3}, g} = 103 - \frac{103}{2} + (- 17.889) = 33.611 k c a l m o l^{- 1}$
$∴$ Heat of formation of methyl radical is $△ H = 33.611 k c a l m o l^{- 1}$

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Similar questions

Q. Bond dissociation energy of

C H_{3} - H

bond is

103 k c a l m o l^{- 1}

and heat of formation of

C H_{4} (g)

- 17.88 k c a l m o l^{- 1} .

The dissociation energy of

H_{2} (g)

into

H

atoms is

103 k c a l / m o l .

The heat of formation of methyl radical is ?

Q. Standard heat of formation of

K I

- 78.31 k c a l m o l^{- 1}

. Calculate its lattice energy from following information:

I E (K) = 4.3 e V

E A (I) = - 73.4 k c a l m o l^{- 1}

Bond dissociation energy of

I_{2}

36.1 k c a l m o l^{- 1}

, sublimation energy of

K

21.51 k c a l m o l^{- 1}

e V

=

23.06 k c a l

)

Q. The dissociation energy of methane is

360 k c a l m o l^{- 1}

. The average bond energy of

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bond in

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Q. Standard heat of formation of

K I

- 78.31 {kcal mol}^{- 1}

. Calculate the lattice energy from following information:

I_{1} (K) = 4.3 eV E_{1} (I) = 73.4 {kcal mol}^{- 1} Bond dissociation energy of I_{2} = 36.1 {kcal mol}^{- 1} Sublimation energy of K = 21.51 {kcal mol}^{- 1}

Q. The average energy required to break a P - P bond in

P_{4} (s)

into gaseous atoms is

53.2 k c a l m o l^{- 1} .

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104.2 k c a l m o l^{- 1}; △_{f} H^{o}

P H_{3} (g)

from

P_{4} (s)

5.5 k c a l m o l^{- 1} .

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Given:

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contains

6 P - P

single bonds.

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Heat of Formation

Standard XII Chemistry

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Bond dissociation energy of CH3−H bond is 103 kcal mol−1 and heat of formation of CH4(g) as −17.88 kcal mol−1. The dissociation energy of H2(g) into H atoms is 103 kcal/mol. The heat of formation of methyl radical is ?

Bond dissociation energy of $C H_{3} - H$ bond is $103 k c a l m o l^{- 1}$ and heat of formation of $C H_{4} (g)$ as $- 17.88 k c a l m o l^{- 1} .$ The dissociation energy of $H_{2} (g)$ into $H$ atoms is $103 k c a l / m o l .$ The heat of formation of methyl radical is ?