The heat of reaction for A - 1-2 O2 - AO is -50 kcal-mol and AO - 1-2 O2 - AO2 is 100 kcal-mol-The heat of reaction in kcal-mol for A - O2 - AO2 will be-

The correct option is A +50 The thermochemical reactions are given below: A + 12 O_2 #160; → AO ; Δ H = 50 kcal/mol AO + 12 O_2 #160; → AO_2 ...

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

Byju's Answer

Standard XII

Chemistry

Hess' Law

The heat of r...

Question

The heat of reaction for $A + \frac{1}{2} O_{2} \to A O$ is $- 50$ kcal/mol and $A O + \frac{1}{2} O_{2} \to A O_{2}$ is $100$ kcal/mol.
The heat of reaction (in kcal/mol) for $A + O_{2} \to A O_{2}$ will be:

- 50

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

+ 50

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

+ 100

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

+ 150

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

Open in App

Solution

The correct option is A $+ 50$
The thermochemical reactions are given below:
$A + \frac{1}{2} O_{2} \to A O; Δ H = - 50$ kcal/mol
$A O + \frac{1}{2} O_{2} \to A O_{2}; Δ H = 100$ kcal/mol
The above two reactions are added to obtain the reaction as follows:

$A + O_{2} \to A O_{2}$
Therefore, the heat of the reaction is $- 50 + 100 = 50$ kcal/mol.

Suggest Corrections

Similar questions

Following are the thermochemical reactions:

H_{2} + \frac{1}{2} O_{2} \to H_{2} O; Δ H = - 68.39

kcal/mol

K + H_{2} O \to K O H (a q) + \frac{1}{2} H_{2}; Δ H = - 48.0

kcal/mol

K O H + H_{2} O \to K O H (a q); Δ H = - 14.0

kcal/mol

The heat of formation (in kcal/mol) of

K O H

is:

Q. In the reaction : S + 3/2

O_{2} \to S O_{3}

+ 2x kcal and

S O_{2} + 1 / 2 O_{2} \to S O_{3}

+ y kcal, heat of formation of

S O_{2}

is:

Q. The heat of formation of

C_{2} H_{5} O H (l)

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

. The heat of combustion of

C H_{3} O C H_{3} (g)

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

△ H_{f}

for

H_{2} O

and

C O_{2}

are

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

and

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

respectively.
Then, the

△ H

for the reaction

C_{2} H_{5} O H (l) \to C H_{3} O C H_{3} (g)

is:

Q. Given :

C (g r a p h i t e) + \frac{1}{2} O_{2} \to C O Δ H_{1} = - 110.5 k J / m o l

C O + \frac{1}{2} O_{2} \to C O_{2} Δ H = - 283.2 k J / m o l

The heat of reaction (in

k J / m o l

) for the following reaction is:

C (g r a p h i t e) + O_{2} \to C O_{2} Δ H = ?

Q. The heat of formation of

C_{2} H_{5} O H (l)

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

. The heat of combustion of

C H_{3} O C H_{3} (g)

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

△ H_{f}

for

H_{2} O

and

C O_{2}

are

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

and

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

respectively.
Then, the

△ H

for reaction

C_{2} H_{5} O H (l) \to C H_{3} O C H_{3} (g)

is :

Join BYJU'S Learning Program

The heat of reaction for A+12O2→AO is −50 kcal/mol and AO+12O2→AO2 is 100 kcal/mol.The heat of reaction (in kcal/mol) for A+O2→AO2 will be:

The correct option is A +50The thermochemical reactions are given below:A+12O2→AO ;ΔH=−50 kcal/molAO+12O2→AO2 ;ΔH=100 kcal/molThe above two reactions are added to obtain the reaction as follows:A+O2→AO2Therefore, the heat of the reaction is −50+100=50 kcal/mol.

The heat of reaction for $A + \frac{1}{2} O_{2} \to A O$ is $- 50$ kcal/mol and $A O + \frac{1}{2} O_{2} \to A O_{2}$ is $100$ kcal/mol.
The heat of reaction (in kcal/mol) for $A + O_{2} \to A O_{2}$ will be: