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Standard XII

Physics

Calorimetry

The heat meas...

Question

The heat measured for a reaction in bomb calorimeter is :

Δ G

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Δ H

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Δ U

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P Δ V

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Solution

The correct option is C $Δ U$
A bomb calorimeter is a type of constant-volume calorimeter used in measuring the heat of combustion of a particular reaction.

Hence, the heat measured for a reaction in bomb calorimeter is $Δ U$ .

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Similar questions

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}

. When

0.1 g

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

2^{\circ} C

. The value of

Δ U

per mole will be :

Q. Chemical reactions are 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 = i n t e r n a l e n e r g y c h a n g e

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 enthalpy of fusion of ice is

6.02 k J m o l^{- 1}

. The heat capacity of water is

4.18 J g^{- 1} C^{- 1}

What is the smallest number of ice cubes at

0^{\circ} C

, each containing one mole of water, that is needed to cool

500 g

of liquid water from

20^{\circ} C

0^{\circ} C

Q. A bomb calorimeter is used to measure the value of heat of reaction at a constant

Q. For the reaction of one-mole zinc dust with one more sulphuric acid in a bomb calorimeter,

Δ U

and

w

correspond to:
[Hint: In bomb calorimeter,

w = 0, Δ U = q

(

- v e

)]

Q. The heat of combustion of ethanal determined in a bomb calorimeter is

- 670.48 K

Cals

{m o l e}^{- 1}

25^{o} C

.What is

Δ H

25^{o} C

for the reaction:

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The heat measured for a reaction in bomb calorimeter is :

The correct option is C ΔUA bomb calorimeter is a type of constant-volume calorimeter used in measuring the heat of combustion of a particular reaction.Hence, the heat measured for a reaction in bomb calorimeter is ΔU.

The correct option is C $Δ U$
A bomb calorimeter is a type of constant-volume calorimeter used in measuring the heat of combustion of a particular reaction.

Hence, the heat measured for a reaction in bomb calorimeter is $Δ U$ .