Five kilograms of liquid carbon tetrachloride undergo a mechanically reversible, isobaric change of state at 1 bar during which the temperature changes from 0∘C to 20∘C0 ∘ C to 20 ∘ C Determine ΔVt, W,Q,ΔHt, and ΔUt.ΔV t ,W, Q,ΔH t , and ΔU t . The properties for liquid carbon tetrachloride at 1 bar and 0∘C0 ∘ C may be assumed independent of temperature: β=1.2×10−3K−1,CP=0.84kJ⋅kg−1⋅K−1, and rho=1590kg⋅m−3β=1.2×10 −3 K −1 ,C P =0.84kJ⋅kg −1 ⋅K −1 , and rho=1590kg⋅m −3

Explanation:

From the information given:

Mass of carbon tetrachloride = 5 kg

Pressure = 1 bar

The given density for carbon tetrachloride = 1590 kg/m³

The specific heat of carbon tetrachloride =  0.84 kJ/kg K

From the composition, the initial volume of carbon tetrachloride will be:

= 0.0031 m³

Suppose is independent of temperature while pressure is constant;

Then:

The change in volume can be expressed as:

However; the workdone = -PdV

W = - 7.6 J

The heat energy Q = Δ h

Q = 84 kJ

The internal energy is calculated by using the 1st law of thermodynamics; which can be expressed as;

ΔU = ΔQ + W

ΔU = 84 kJ + ( -7.6 × 10⁻³ kJ)

ΔU = 83.992 kJ

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