MyQuestionIcon

1

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

Difference between Internal Energy and Enthalpy

When a reacti...

Question

When a reaction is carried out in a closed vessel:

A

q_{P} < q_{V}

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

B

q_{P} > q_{V}

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

C

q_{P} = q_{V}

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

D

q_{V} = 0

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

Open in App

Solution

The correct option is C $q_{P} = q_{V}$
When a reaction is carried out in a closed vessel, volume change is zero so
$Δ H = Δ U + P Δ V = Δ U$
$q_{P} = q_{V}$

Suggest Corrections

thumbs-up

2

Similar questions

Q. For a particular reaction, heat of combustion at constant pressure

(q_{P})

is always greater than that at constant volume

(q_{V})

.
If true........1
else ...........0

Q. Assertion :For a particular reaction, heat of combustion at constant pressure

(q_{P})

is always greater than that at constant volume

(q_{V})

. Reason: Combustion reactions are invariably accomplished by increase in number of moles.

Chemical reaction is invariably associated with the transfer of energy either in the form of heat or light. In the laboratory, heat changes in physical and chemical processes are measured with an instrument called Calorimeter. Heat change in the process is calculated as :

q = m s Δ T

s = s p e c i f i c h e a t

= c Δ T

c = h e a t c a p a c i t y

Heat of reaction at constant volume is measured using bomb Calorimeter.

q_{V} = Δ U =

internal energy change
Heat of reaction at constant pressure is measured using bomb Calorimeter.

q_{P} = Δ H

q_{P} = q_{V} + P Δ V

Δ H = Δ U + Δ n R T

The heat capacity of a bomb calorimeter is

500 J K^{- 1}

0.1 g

of Methane was burnt in this calorimeter, the temperature rose by

2^{\circ} C

Δ U

per mole will be :

Q. Assertion :Two capacitors are connected in series with a battery. Energy stored across them is in inverse ratio of their capacity. Reason:

U = \frac{1}{2} q V

U \propto q V

.

Q. In the product

\to F = q (\to v \times \to B) = q \to v \times (B^i + B^j + B_{0}^k)

q = 1

\to v = 2^i + 4^j + 6^k

\to F = 4^i - 20^j + 12^k

What will be the complete expression for

\to B

?

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Enthalpy

CHEMISTRY

Watch in App

explore_more_icon

Explore more

Difference between Internal Energy and Enthalpy

Standard XII Chemistry

Join BYJU'S Learning Program

CrossIcon