Thermodynamics and Thermochemistry 1 Question 18

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21. ΔU is equal to

======= ####21. ΔU is equal to

3e0f7ab6f6a50373c3f2dbda6ca2533482a77bed (a) isochoric work

(b) isobaric work

(c) adiabatic work

(d) isothermal work

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Solution:

  1. According to first law of thermodynamics,

ΔU=q+W=qpΔV

In isochoric process (ΔV=0),ΔU=q

In isobaric process (Δp=0),ΔU=q

In adiabatic process (q=0),ΔU=W

In isothermal process (ΔT=0) and ΔU=0

ΔU is equal to adiabatic work.