Calculate the change in molar Gibbs energy of carbon dioxide (treated as a perfect gas) at 20 oc when its pressure is changed isothermally from 1.0 bar to (a) 3.0 bar. (b) 2.7 x 10-4 atm. its partial pressure in dry air at sea level.

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answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.