MyQuestionIcon

1

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

Heat of Formation

AB,A2 and B2...

Question

$A B, A_{2}$ and $B_{2}$ are in the ratio $1 : 1 : 0.5$ and the enthalpy of formation of $A B$ from $A_{2}$ and $B_{2}$ is $200 k J {m o l}^{- 1}$ . What is the bond enthalpy of $A_{2}$ ?

A

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

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

B

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

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

C

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

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

D

300 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 $800 k J {m o l}^{- 1}$
Let energy of formation of $A_{2}$ be $E$
then reaction is,
$\frac{1}{2} A_{2} + \frac{1}{2} B_{2} ⟶ A B$
Energy of 0.5 mol $A_{2}$ bond $= 0.5 E$
Energy of 0.5 mol $B_{2}$ bond $= \frac{0.5 E}{2}$ (As ratio is 0.5)
Energy of 1 mol $A B = E$ (As ratio is 1)
Total energy $= E - 0.75 E = 0.25 E = 200$
$E = 800 k J / m o l$

Suggest Corrections

thumbs-up

0

Similar questions

A B, A_{2}

B_{2}

are diatomic molecules. If the bond enthalpies of

A_{2}, A B & B_{2}

are in the ratio 1 : 1 : 0.5 and enthalpy of formation of AB from

A_{2}

B_{2}

is - 100 kJ/mol

^{- 1}

. What is the bond enthalpy of

A_{2}

.

A B, A_{2}

B_{2}

are diatomic molecules. If the bond enthalpies of

A_{2}, A B

B_{2}

are in the ratio

1 : 1 : 0.5

and enthalpy of formation of

A B

A_{2}

B_{2}

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

. What is the bond energy of

A_{2}

?

Q. Bond energy of

A B

A_{2}

B_{2}

are in the ratio

1 : 1 : 0.5

and the enthalpy of formation of

A B

A_{2}

B_{2}

- 100

^{- 1}

. Then the bond enthalpy of

A_{2}

A B

A_{2}

B_{2}

are diatomic molecules. If the bond enthalpies of

A_{2}, A B

B_{2}

are in the ratio 1 : 1 : 0.5 respectively and enthalpy of formation of

A B

A_{2}

B_{2}

- 100 {kJ/mol}^{- 1}

. What is the bond enthalpy of

A_{2}

A B, A_{2}

B_{2}

are diatomic molecules. If the bond enthalpies of

A_{2}, A B

B_{2}

are in the ratio

2 : 2 : 1

and ethalpy of formation

A B

A_{2}

B_{2}

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

. What is the bond energy of

A_{2}

?

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