CameraIcon

SearchIcon

MyQuestionIcon

1

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

Enthalpy

For the combu...

Question

For the combustion of 1 mole of liquid benzene at $25^{\circ} C$ , the heat of the reaction at constant pressure is given by,
$C_{6} H_{6} (l) + 7 \frac{1}{2} O_{2} (g) ⟶ 6 C O_{2} (g) + 3 H_{2} O (l)$
$Δ H = - 780980 c a l$
What would be the heat of the reaction at constant volume?

A

781080 c a l

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

B

- 780900 c a l

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

C

780000 c a l

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

D

- 780086 c a l

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

Open in App

Solution

The correct option is D $- 780086 c a l$
We have, $Δ H = Δ U + Δ n_{g} R T$
Here, $Δ n_{g} = 6 - 7.5 = - 1.5$
Thus, $Δ U = Δ H - Δ n_{g} R T$
$Δ U = - 780980 - (- 1.5) \times 2 \times 298$
$Δ E = - 780086 c a l$

Suggest Corrections

thumbs-up

0

Similar questions

Q. For the combustion of 1 mol of liquid benzene at

25^{o} C

, the heat of reaction at constant pressure is given by,

C_{6} H_{6} (l) + \frac{15}{2} O_{2} (g) \to 6 C O_{2} (g) + 3 H_{2} O (l)

Δ H = - 780980 k c a l

.
What would be the heat of reaction at constant volume?

Q. For the combustion of 1 mole of liquid benzene at

25^{o} C,

the heat of reaction at constant pressure is given by

C_{6} H_{6} (l) + 7 \frac{1}{2} O_{2} (g) \to 6 C O_{2} (g) + 3 H_{2} O (l); △ U = - 780980 c a l

What would be the heat of reaction at constant volume?

Q. For the combustion of 1 mol of liquid benzene at

25^{o} C

, the heat of reaction at constant pressure is given by,

C_{6} H_{6} (l) + \frac{15}{2} O_{2} (g) \to 6 C O_{2} (g) + 3 H_{2} O (l)

Δ H_{p} = - 780980 c a l m o l^{- 1}

.
What would be the heat of reaction at constant volume?

Q. For combustion of 1 mole of benzene at

25^{0} C

, the heat of reaction at constant pressure is - 780.9 kcal. What will be the heat of reaction at constant volume?

C_{6} H_{6 (I)} + 7 \frac{1}{2} O_{2 (g)} \to 6 C O_{2 (g)} + 3 H_{2} O_{(l)}

Q. For the combustion of 1 mole of liquid benzene at

25^{\circ} C

, the heat of reaction at constant pressure is -780.9 kcal

C_{6} H_{6 (1)} + 7 \frac{1}{2} O_{2} (g) \to 6 C O_{2 (g)} + 3 H_{2} O_{(1)}

The heat of reaction at constant volume

View More

Join BYJU'S Learning Program

explore_more_icon

Explore more

Standard XII Chemistry

Join BYJU'S Learning Program

CrossIcon