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Define entropy and enthalpy???

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Define entropy and enthalpy???

Posted by Tanya ?? 4 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 4 years, 1 month ago

Enthalpy is defined as the sum of internal energy of a system and the product of its pressure and volume. It is denoted by the symbol E. It is a state function. Units used to express are calorie, BTU, or joules. Below we have given the equation.

Enthalpy Equation:

E= U + PV where,

E is the enthalpy

U is the internal energy of a system

P is the pressure

V is the volume

Entropy is defined as the measure of the thermal energy of a system per unit temperature which is not available for doing useful work. It is denoted as S. The SI unit for Entropy is Joules per Kelvin. Entropy change at constant temperature is calculated as given below:

ΔS_system= q_rev/ T

ΔS represents the change in entropy,

q_rev represents the reverse of the heat, and

T is the temperature in the Kelvin scale.

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