Question

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ING ISDN HIV382 100 14.8= 35.2 2500424 2074 Page 3 of 9 solution containing 14.8 of Balonin 1000s of water is combined with a sation containing 42.6 g of HCL 2500 of water in a calorimeter at 22.3 "C, a reaction occurs, Born Portue HCl(aq) + Ba(OH)3(aq) -- BaC1:(aq) + 2H:01 and the temperature of the mixture increases to 27.9 "C. The heat capacity of the calorimeter 15 17.2 J/"C. Assuming that the specific heat of the aqueous mixture is 4.184 J/g °C, calculate Hún kJ. q : Smin Mais Alive = (4.1895/gil 11292.69) 1279-92.30) + 172(23.9.265/ DHEG 5.6855.75 SH=-6855.15 les 1-6.963 . Use the kinetic-molecular theory to explain why a decrease in gas temperature would lead to Charless

Answer 1

Heat absorbed by the aquous mixture(q₁)

q₁ = m × ∆T × C

m = mass of quous mixture, 407.4g

∆T = Temperature difference of aquous mixture , 5.6℃

C = specific heat capacity of aquous mixture , 4.184J/g℃

q₁ = 407.4g × 5.6℃ × 4.184J/g℃

q₁ = 9545.5J

Heat absorbed by the caloriemeter(q₂)

q₂ = ∆T × C

∆T = temperature difference of caloriemeter, 5.6℃

C = heat capacity of calorimeter, 17.2J/℃

q₂ = 5.6℃ × 17.2J/℃

q₂ = 96.32J

∆H = - (q₁ + q₂)

∆H = - ( 9545.5J + 96.32J)

∆H = -9641.8J

∆H = - 9.64 kJ