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Standard IX

Physics

Heat Transfer

Heat change i...

Question

Heat change in a chemical reaction, at constant temperature and pressure is called:

entropy

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enthalpy

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internal energy

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free energy

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Solution

The correct option is C enthalpy
Ethalpy is the heat change in a chemical reaction at constant temperature and pressure.

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Similar questions

Q. Select the correct statements.
a. There is asymmetry between converting work to heat and converting heat to work.
b. No process is possible in which the sole result is the absorption of heat from a reservoir and its complete conversion into work.
c. For every chemical reaction at equilibrium, standard change in Gibbs free energy is zero.
d. At constant temperature and pressure, chemical reactions are spontaneous in the direction of decreasing Gibbs energy.

Q. Assertion: For every chemical reaction at equilibrium, the standard Gibbs energy of reaction is zero.
Reason: At constant temperature and pressure, chemical reactions are spontaneous in the direction of decreasing Gibbs energy.

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 :

ASSERTION(A): For every chemical reaction at equilibrium, standard Gibbs energy of the reaction is zero.
REASON(R): At constant temperature and pressure, chemical reactions are spontaneous in the direction of the decreasing Gibbs energy.

Q. The heat energy required during the change of state from solid to liquid at constant temperature is called latent heat of .

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Heat change in a chemical reaction, at constant temperature and pressure is called:

The correct option is C enthalpyEthalpy is the heat change in a chemical reaction at constant temperature and pressure.

The correct option is C enthalpy
Ethalpy is the heat change in a chemical reaction at constant temperature and pressure.