(a) Interpretation: Calculate the required heat input. Concept introduction: The open-system energy balance equation is, Q − W S = Δ H + Δ E K + Δ E P Where, Q = heat absorbed by the system, W S = Shaft work done by the system on the surroundings, Δ H , Δ E K and Δ E P are internal energy, kinetic energy and potential energy respectively.

Question

Three moles of nitrogen at 30°C are contained in a container of a certain volume. If we ignore the heat capacity of this container, how much heat should we apply to the system to raise the temperature of nitrogen to 250°C? If the mass of the container is 100 kg and the heat capacity is 0.5 kJ/(kg°C), what is the required heat? At this time, nitrogen is Cv=20.8 and Cp=29.1 J/(mol°C).

Answer 1

Question

Chapter 7, Problem 7.27P

Interpretation Introduction

(a)

Interpretation:

Calculate the required heat input.

Concept introduction:

The open-system energy balance equation is,

Q−WS=ΔH+ΔEK+ΔEP

Where, Q = heat absorbed by the system, WS = Shaft work done by the system on the surroundings, ΔH, ΔEK and ΔEP are internal energy, kinetic energy and potential energy respectively.

Interpretation Introduction

(b)

Interpretation:

Calculate the required heat input and explain the physical significance of the calculated values.

Concept introduction:

The open-system energy balance equation is,

Q−WS=ΔH+ΔEK+ΔEP

Where, Q = heat absorbed by the system, WS = Shaft work done by the system on the surroundings, ΔH, ΔEK and ΔEP are internal energy, kinetic energy and potential energy respectively.

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