Question

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Heat Capacity of a Gas at Constant Pressure A system comprised of 1.900x100 g of C2H6(9) cools from 180.0°C to 45.0°C at a constant pressure of 2.5 atm. The molar heat capacity at constant pressure for C2H6(9) is 52.92 J K-1 mol-1. Calculate q. 1 pts Submit Answer Tries 0/5 Calculate w. 1 pts Submit Answer Tries 0/5 Calculate ΔΕ. 1pts Submit Answer Tries 0/5 Calculate ΔΗ. 1pts Submit Answer Tries 0/5

Answer 1

→ ~ AT - 45°C - 180°c = -135°C - - 135K q = MCAT m-moles, p = Molar heat . Capacity Molar mass 6 H6 =30.07 g/mol mass G HG = 1.900 x 10 g Moles = mass - 1.900 810' 9 O. 632 mol. - Molar mass 30.07 g/mol 9 = 0.632 mol X 52-92 J K imalo x (-135 K) a = - 4515.1 J = - 4.52 kJ At constant Pressure Wi-P AV = nROT - Moles 4 Gas constant W =-60.632 mol X 8 -314J Ky mol X (-135k) WE +709.35 J = 0.709 KJ As per first law of thermodynamics i E = q two AE = -4.52 KJ t 0.709 KJ = -3.81 kJ At constant pressure, - AH = q So AH = -4.52 kJ Also, per mole values & AE = -3.81 KJ = -6.03 kJ/mol 0.632 mol OH = -4052 KJ =-7015 kJ/mol. 0.632 mol