# Chemical Process Calculation Questions and Answers – Enthalpy – I

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This set of Chemical Process Calculation Multiple Choice Questions & Answers (MCQs) focuses on “Enthalpy – I”.

1. Enthalpy (H) is
a) H = U + PV
b) H = U – PV
c) H = U*PV
d) None of the mentioned
Where: U-Internal energy, P- Pressure, V- Volume

Explanation: H = U + PV.

2. Specific enthalpy is the function of
a) Temperature and Pressure
b) Temperature and Volume
c) Pressure and Volume
d) None of the mentioned

Explanation: H = f(T, P).

3. Cp is the change in enthalpy with respect to temperature at constant _____________
a) Pressure
b) Volume
c) Temperature
d) None of the mentioned

Explanation: Cp is the change in enthalpy with respect to temperature at constant Pressure.
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4. For ideal gases, Enthalpy and Internal energy is only the function of __________
a) Pressure
b) Volume
c) Temperature
d) None of the mentioned

Explanation: For ideal gases, Enthalpy and Internal energy is only the function of Temperature.

5. Enthalpy has no absolute value. Only changes can be calculated.
The given statement is
a) Correct
b) Incorrect
c) Always incorrect
d) None of the mentioned

Explanation: Enthalpy is calculated with respect to a reference, there is no absolute value.

6. For ideal gases, the heat capacity relation is
a) Cp = Cv – R
b) Cv = Cp + R
c) Cp – Cv = R
d) None of the mentioned

Explanation: Cp – Cv = R.

7-10. For the given figure 7. What is T1?
a) T, melting
b) T, freezing
c) T, vaporization
d) T, condensation

Explanation: T1 is the melting temperature.

8. What is T2?
a) T, melting
b) T, freezing
c) T, vaporization
d) T, condensation

Explanation: T2 is the vaporization temperature.

9. What is H1?
a) Heat of fusion
b) Heat of vaporization
c) Heat of sublimation
d) None of the mentioned

Explanation: H1 is the heat of fusion.

10. What is H2?
a) Heat of fusion
b) Heat of vaporization
c) Heat of sublimation
d) None of the mentioned

Explanation: H2 is the heat of vaporization.

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