MyQuestionIcon

1

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

Heat of Formation

The enthalpy ...

Question

The enthalpy of combustion of $H_{2} (g)$ at 298 K to give $H_{2} O (g)$ is -249 kJ mol $^{- 1}$ and bond enthalpies of H-H and O-O are 433 kJ mol $^{- 1}$ and 492 kJ mol $^{- 1}$ respectively. The bond enthalpy of O-H is

A

464 k J m o l^{- 1}

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

B

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

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

C

232 k J m o l^{- 1}

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

D

- 232 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 A $464 k J m o l^{- 1}$
We have
Given - $ϵ_{H - H} = 433 k J m o l^{- 1}$ & $ϵ_{O = O} = 492 k J m o l^{- 1}$
Hence, $ϵ_{H - H} + \frac{1}{2} ϵ_{O = O} - 2 ϵ_{O - H} = (433 + \frac{1}{2} \times 492) k J m o l^{-} - 2 ϵ_{O - H} = - 249 k J m o l^{- 1}$
Hence , $ϵ_{O - H} = 464 k J m o l^{- 1}$

Suggest Corrections

thumbs-up

9

Similar questions

Q. The enthalpy of combustion of

H_{2} (g)

at 298 K to give

H_{2} O (g)

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

and bond enthalpies of H - H and O = O are

433 k J m o l^{- 1}

492 k J m o l^{- 1},

respectively. The bond enthalpy of O - H is

Q. Calculate the enthalpy of formation of water, given that the bond energies of

H - - H

O - - O

O - - H

433 k J m o l^{- 1}

492 k J m o l^{- 1}

464 k J m o l^{- 1}

, respectively.

Q. The enthalpy of combustion of

H_{2} (g)

at 298 K to give

H_{2} O (g)

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

and bond enthalpies of H - H and O = O are

433 k J m o l^{- 1}

492 k J m o l^{- 1},

respectively. The bond enthalpy of O - H is

Q. The enthalpy of combustion of

H_{2 (g)}

H_{2} O_{(g)}

- 249

^{- 1}

and bond enthalpies of

H - H

O = O

433

^{- 1}

492

^{- 1}

respectively. The bond enthalpy of

O - H

Q. The enthalpies of formation of

O H (g)

H (g)

O (g)

k J m o l^{- 1}

k J m o l^{- 1}

k J m o l^{- 1} .

The value of bond enthalpy

O - H

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Thermochemistry

CHEMISTRY

Watch in App

explore_more_icon

Explore more

Heat of Formation

Standard XII Chemistry

Join BYJU'S Learning Program

CrossIcon