Question

t 1 atm, one cup (225 grams) of water is heated from 298.15 K to the boilingtemperature (373.15 K), turns completely into steam, and finally reaches a temperature of 423.15 K.a. (6 Points) Compute the enthalpy change (∆H) for the entire processb. (6 Points) Compute the entropy change (∆S) for the entire processNote that i) the molecular weight of water is 18.015; ii) the heat capacity of liquid water has a roughlyconstant value of 75.3 J K−1mol−1; iii) the heat capacity of water steam has a roughly constant value of33.6 J K−1mol−1; and iv) the enthalpy of vaporization of water is 40.65 kJ mol−1.

Answer 1

Al 1 atm m = 225 g. (liquid) T = 298,15k slik mor T = 373, 15 k Pie 75.3 J Kamy Ps= 33.6 J sy q (phase change Kong 7 = 373,15 k ( Speam) vap = 40,65 kJ mo To = 423,15 K (steam). To find for 6 6 oH As entire process entire process for CS Scanned y He Q, + 8z + Q2

let n moles of water, na mauss morar mars 225g = 12.490 mon 18.015 /mon 9 = np. (T2-T, ) - 12.190 x 75,3 X (373,15_298,15) - 94046.63 T Q = nAvap = 12.490 X 40.65 507.70 KJ 507701.92 J = Az = nCpp (T3-T2) = 12.490 x 1423, 15-373.15) x 33,6 = 20982.515 Adding all a's BH= 622431.06J cs selayed witiro en tire preress, AH = 622.73 kJ Camſcanner

os = As, tas tas, Now ss = n ou la. (7.) + oHelene + nogos In (11) 40.65 xlo 373.15 As - 12.190 x (23.49 + 4.225) + 108.94 As = 455.0977 process in so the As fa entire Tos= 455.10 Slk Ay Ics Scanned with CamScanner

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