When work is done hy a system and no heat is added, the temperature of the syste

Question

When work is done hy a system and no heat is added, the temperature of the systerm A) decreases 8) semains unchanged C) increases 12) Two solutions, 250.0 ml of 1,00 M Caping and 250.0 ml. of 1.00 M, are added to a calorimeter with a total heat capacity after the solutions are added, of 125 kC and the temperature decreased by 2.40 C. Determine qrn per mole of CasO4(s) formed in the reaction as follows CaCl2(aq) + K2504(ag) Casols) * 2Kaag) A) +6.00 kJ/mol B)-600 C)-12.0 kJ/mol D) +12.0 kJ/mol addresses the direction of heat flow? 13) Which law of thermodynamics B) second law C) first law D) all of the above A) third law 14) A system absorbs 623 J of heat while doing 457 J of work. What is the value of AE? E) -1080 J B)+166J C)+1080J D) +623J A) -166J n inc h diameter ball of pure cobalt metal at 225 C was placed in 100 gal. of water at 15.0°C. What is the final

Explanation / Answer

CaCl2(aq)+ K2SO4(aq)---->CaSO4(s)+2KCl(aq)

No of mol of CaCl2 = 0.25*1 = 0.25 mol

amount of energy absorbed = 2.4*1.25 = 3 kj

amount of energy absorbed per mol = 3/0.25 = 12 kj/mol

q rxn = +12 kj/mol

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