Question

Problem 5 (10 pts) A sealed balloon filled with helium, whose initial volume was 2.30 L is heated from -12 °C to 64 "C under a constant pressure of 1.016 atm. (a) How much energy is transferred through work? State your answer in calories. (3pts) (b) The specific heat capacity of helium is 5.19 J/g C. Determine the amount of thermal energy in joules transferred in this process. (3pts) (c) What is the total change in energy for the balloon in this problem? State your answer in literatm. (3pts) (d) Was this process endothermic or exothermic? (1 pts)

Answer 1

V = 2.30 L, T, = -12°c, Izz 64°C under constant Pressure P =) - 0 It const Pressure 2= 2.30 x (64 +273) (-12 +273) = 2.30 x 1.2911 = 2.9697 L Work = P ( ₂ - V) = 1.016 (2.9697 - 2-30) 20.680 L-atry cal I tatu = 24,2 680 atm = 24.2 x 0,680 cal 6.68 Aus calorie work =116.5 Scanned with CamScanner

- C = 8.19 9/goc for helium As p V = nRT 2016 X 2.300 0.082057x (273-12) hc o. 169 шля is GRENSE helium 4.00 26 morar mass helium = 0.10g x 4.0026 man mue = 0.44 g Now , = nCOT = 0.44x silox (64 = 172.3 J Thermal energy in (Joules) is [172.3 I © As per ist low of themody name AU 9 - W Scanned with CamScanner

where, 8 = 172. 3 5 CI Latin = 101.3255 Ja Latim) 107.025 8 = 1.7 L-atm Also, w= 0.680 L-ałm ou = 1-7 -0.680 Tau = 1.02 L-atmone o Endo there, As balloon was heated. Scanned with CamScanner

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