Question

Change in enthalpy in a closed system is equal to
heat transferred if the reversible process takes place
at constant
(a) pressure
(6) temperature
(c) volume
(d) internal energy
(e) entropy.
​

Answer 1

Answer:

(a) Pressure

Explanation:

Enthalpy is a Thermodynamics quantity.It means that how the Heat can be converted to other energies.

Answer 2

Answer:

The correct answer is (a) pressure.

Explanation:

• Enthalpy of a substance is defined as: h=u+ pV
• According to the First Law of Thermodynamics for a process

8Q = du + SW

8Q = du + p.dV (process involving just pdV work]

At constant pressure,

p.dV = d(pV)

(6Q)p = du + d(pV)

(8Q), = d(u + pV)

(8Q), = dh

i.e. The enthalpy of a system increases as heat is transmitted at a constant pressure.

• The change in a system's enthalpy is equal to the heat flow while the pressure is constant: ΔH=qp

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