Question

A sample of carbon monoxide gas whose mass is 6.02 g is heated from 25 oC to 156 oC at a constant pressure of 4.86 bar.

Calculate q (in J) for this process.

Calculate w (in J) for this process.

Calculate ΔE (in J) for this process.

Answer 1

mass of CO = 6.02g

Molar mass of CO = 28.009g/mol

No of mole of CO, n= 6.02g/28.009g/mol = 0.21493

work done by system is w

at constant pressure

w= - (n R ∆T )

= - ((0.21493mol)×8.314(J/ K mol) × ( 429.15K - 298.15K))

= - 234.1J

∆E = nCv∆T

Heat capacity of CO, Cv= 20.89(J/ K mol)

∆E = 0.21493mol × 20.89(J/K mol)× (429.15K - 298.15K)

   = 588.2J

   According to first law of Thermodynamics

   ∆E = q + w

q = ∆E - w

   = 588.2J + 234.1J

= 822.3J