28.5 expands p2.6 a 1.50 mole sample of an ideal gas at ℃ isothermally from an initial volume of 22.5 dm3 to a final vol ume of 75.5 dm3. calculate w for this process (a) for expan sion against a constant external pressure of 1.00 × 105 pa, and (b) for a reversible expansion. p2.7 calculate q, w, δ1, and δ h if 2.25 mol of an ideal gas with cv, m 3r/2 undergoes a reversible adiabatic expansio ume v, 25.0 m3. the initial temperature is 275 k. on from an initial volume vi = 5.50 m3 to a final vol p2.8 calculate w for the adiabatic expansion of 2.50 mol of a ideal gas at an initial pressure of 2.25 bar from an initial temper ature of 450. k to a final temperature of 300. k. write an expression for the work done in the isothermal reversible expan sion of the gas at 300. k from an initial pressure of 2.25 bar. what value of the final pressure would give the same value of w as the first part of this problem? assume that cpm 5r/2. 0.9970 g cm-3, and cpm 75.3 j k1 mol 1.the change in volume with temperature is given by av-vinitia1βδ t where β, the coefficient of thermal expansion, is 2.07 × 10-4 k-1 . if the temperature of 325 g of water is increased by 25.5 k, calculate w, q, ah, and δu. p2.10 a muscle fiber contracts by 3.5 cm and in doing so lifts a weight. calculate the work performed by the fiber assume the muscle fiber obeys hooke's law f-kx with a force constant k of 750. n m-1 p2.11 a cylindrical vessel with rigid adiabatic walls .