The difference between the heats of a reaction at constant pressure and volume for the reaction 2 C 6 H 6 l -15 O 2 g - 12 CO 2 g -6 H 2 O l at25- C in kJ is-A- -7-43 kJB- -4-43 kJC- -1-43 kJD- None of the above

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

Enthalpy

The differenc...

Question

The difference between the heats of a reaction at constant pressure and volume for the reaction $2 C_{6} H_{6} (l) + 15 O_{2} (g) \to 12 C O_{2} (g) + 6 H_{2} O (l)$ at 25°C in kJ is:

- 7.43 k J

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

- 4.43 k J

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

- 1.43 k J

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

None of the above

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

Open in App

Solution

The correct option is A $- 7.43 k J$
$△ H - △ U$ = $△ n$ RT
$△ n$ = Number of moles of gaseous products $-$ number of moles of gaseous reactants.
$△ n$ = $12 - 15$ = $- 3$
$△ H$ is change in enthalpy
$△ U$ is change in internal energy
Substituting the respective values,
$△ H - △ U = - 3 \times 8.314 \times 298 = - 7.43 k J$

Suggest Corrections

Similar questions

The difference between heat of reaction at constant pressure and constant volume for the reaction given below at 25 $^{0}$ C in kJ is: $2 C_{6} H_{6 (l)} + 15 O_{2 (g)} \to 12 C O_{2 (g)} + 6 H_{2} O_{(l)}$

Q. The difference between heats of reaction at constant pressure and at constant volume for the reaction

2 C_{6} H_{6} (l) + 15 O_{2} (g) \to 12 C O_{2} (g) + 6 H_{2} O (l) a t 25^{\circ} C

at in kJ is

Q. The difference between heats of reaction at constant pressure and constant volume for the reaction;

2 C_{6} H_{6} (l) + 15 O_{2 (g)} \to 12 C O_{2} (g) + 6 H_{2} O (l)

25^{o} C

k J

is:

Q. The difference between the heats of a reaction at constant pressure and volume for the reaction

2 C_{6} H_{6} (l) + 15 O_{2} (g) \to 12 C O_{2} (g) + 6 H_{2} O (l)

at 25°C in kJ is:

Q. The difference between the heat of reaction at constant pressure and constant volume for the reaction

2 C_{6} H_{6} (l) + 15 O_{2} (g) \to 12 C O_{2} (g) + 6 H_{2} O (l)

25^{\circ} C

k J

is:

Join BYJU'S Learning Program

Explore more

Enthalpy

Standard XII Chemistry

Join BYJU'S Learning Program

The difference between the heats of a reaction at constant pressure and volume for the reaction 2C6H6(l)+15O2(g)→12CO2(g)+6H2O(l) at 25°C in kJ is:

The difference between the heats of a reaction at constant pressure and volume for the reaction $2 C_{6} H_{6} (l) + 15 O_{2} (g) \to 12 C O_{2} (g) + 6 H_{2} O (l)$ at 25°C in kJ is: