CameraIcon

SearchIcon

MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Heat of Reaction

The enthalpie...

Question

The enthalpies of atomization of $C H_{4} (g)$ and $C_{2} H_{6} (g)$ are respectively $400 k J m o l^{- 1}$ and $670 k J m o l^{- 1} .$ The value of $△ H_{C - C}$ would be

A

270 k J m o l^{- 1}

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

B

70 k J m o l^{- 1}

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

C

200 k J m o l^{- 1}

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

D

240 k J m o l^{- 1}

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

Open in App

Solution

The correct option is B $70 k J m o l^{- 1}$
$C H_{4} (g) \to C (g) + 4 H (g) △ H_{a t o m} = 400 k J$
$△ H_{a t o m} = 4 \times Δ H_{C - H}$
$∴ △ H_{C - H} = \frac{400}{4} = 100 k J m o l^{- 1}$
$C H_{3} - C H_{3} (g) \to 2 C (g) + 6 H (g); △ H_{a t o m} = 670 k J$
$670 = △ H_{C - C} + 6 △ H_{C - H}$
$∴ △ H_{C - C} = 670 - 6 \times 100 = 70 k J m o l^{- 1}$
hence, $△ H_{C - C} = 70 k J m o l^{- 1}$

Suggest Corrections

thumbs-up

0

Similar questions

Q. The enthalpies of atomization of

C H_{4} (g)

C_{2} H_{6} (g)

are respectively

400 k J m o l^{- 1}

670 k J m o l^{- 1} .

△ H_{C - C}

Q. The enthalpy change for the reaction

C_{3} H_{8} (g) + H_{2} (g) \to C_{2} H_{6} (g) + C H_{4} (g)

25^{o}

is -55.7 kJ / mol . Calculate the enthalpy of combustion of

C_{2} H_{6} (g)

. The enthalpy of combustion of propane is

- 2220 k J m o l^{- 1}

and enthalpy of

H_{2}

C H_{4}

are -285.8 KJ/mol and -890 KJ/mol respectively.

Q. The enthalpy of combustion of methane graphite and dihydrogen at

298 K

- 890.3

m o l^{- 1}

- 285.8

m o l^{- 1}

respectively. Enthalpy of formation of

C H_{4} (g)

Q. Bond dissociation enthalpies of

H_{2} (g) a n d N_{2} (g)

436.0 k J m o l^{- 1}

941.3 k J m o l^{- 1}

respectively. Enthalpy of formation of

N H_{3}

- 46.0 k J m o l^{- 1}

. What is the enthalpy of atomization of

N H_{3}

.

Q. Bond dissociation enthalpies of

H_{2_{(} g)}

N_{2_{(} g)}

K J

m o l^{- 1}

K J

m o l^{- 1}

, respectively and enthalpy of formation of

N H_{3_{(} g)}

- 46 K J

m o l^{- 1}

What is the enthalpy of atomization of

N H_{3_{(} g)}

and the average bond enthalpy of

N - H

bond respectively (in

K J

m o l^{- 1}

View More

Join BYJU'S Learning Program

explore_more_icon

Explore more

Heat of Reaction

Standard XII Chemistry

Join BYJU'S Learning Program

CrossIcon