MyQuestionIcon

3

You visited us 3 times! Enjoying our articles? Unlock Full Access!

Heat of Reaction

The dissociat...

Question

The dissociation energy of methane is 360 k cal/mol and that of ethane is 620 kcal mol $^{- 1}$ the bond energy of one mole C-C bonds is (in k cal)

A

210

No worries! We‘ve got your back. Try BYJU‘S free classes today!

B

130

No worries! We‘ve got your back. Try BYJU‘S free classes today!

C

180

No worries! We‘ve got your back. Try BYJU‘S free classes today!

D

80

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

The correct option is D 80
For one mole methane (contains 4 C-H bonds ), dissociation energy is 360 kJ
which means,
a.
$(4 \times B o n d e n e r g y o f C - H b o n d) (N_{A}) = 360 k J$

For one mole ethane (contains 6 C-H bonds and 1 C-C bond ), dissociation energy is 360 kJ
which means,
b.
$(6 \times B o n d e n e r g y o f C - H b o n d + B o n d e n e r g y o f C - C b o n d) (N_{A}) = 620 k J$

After multiplying equation a with 3 and equation b with 2,we get;

c.
$(12 \times B o n d e n e r g y o f C - H b o n d) (N_{A}) = 1080 k J$

d.
$(12 \times B o n d e n e r g y o f C - H b o n d + 2 \times B o n d e n e r g y o f C - C b o n d) (N_{A}) = 1240 k J$

subtracting equation c from d, we get;
$2 \times B o n d e n e r g y o f C - C b o n d = 160 k J$

$B o n d e n e r g y o f C - C b o n d = 80 k J$

Suggest Corrections

thumbs-up

0

Similar questions

Q. The dissociation energy of methane is 360 k cal/mol and that of ethane is 620 kcal mol

^{- 1}

the bond energy of one mole C-C bonds is (in k cal)

Q. The dissociation energy of methane is 360 k cal/mol and that of ethane is 620 kcal mol

^{- 1}

the bond energy of one mole C-C bonds is (in k cal)

Q. The dissociation energy of methane and ethane are

360

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

e_{C - - C}

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

Q. The dissociation energy of methane is

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

. The average bond energy of

C - - H

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

The enthalpy of atomisation of $C H_{4}$ and $C_{2} H_{6}$ are 360 and 620 k cal $m o l^{- 1}$ respectively. The C - C bond energy is expected to be ?

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Thermochemistry

CHEMISTRY

Watch in App

explore_more_icon

Explore more

Heat of Reaction

Standard XII Chemistry

Join BYJU'S Learning Program

CrossIcon