Chemistry 101 Thermochem Workshop 2 Name Two solutions, initially at 24.60°C, ar
ID: 696219 • Letter: C
Question
Chemistry 101 Thermochem Workshop 2 Name Two solutions, initially at 24.60°C, are mixed in a coffee cup calorimeter (Ccals 15.51/"C, volume of 0.100 M AgNO3 solution is mixed with a 100.0 mL sample of 0.200 M NaCI solution, the temperature in the calorimeter rises to 25.30°C. Determine the Hmn for the reaction as written below. Assume that the density and heat capacity of the solutions is the same as that of water. What absorbed most of the heat? (ans:-60L) 1) when a 1000 mt NaCI(aq) + AgNO3(aa) AgCl(s) Na NO 3(aq) t"rxn-? + 4.v., 9cG 2) Use the information provided to determine Hrxn for the following reaction. (ans:-47 kJ) compound "f (kJ/mol) Fe203(s) 824 3 824 C-)Explanation / Answer
Q= mC*(Tf-Ti) + CCal(Tf-Ti)
mass = 100+100 = 200 g
C = 4.18
Q = (200*4.184)(25.30-24.60) + 15.5*(25.30-24.60) = 596.61 J
Qreaction = -q = -596.61
HRXN = Qrxn/n
mol = MV = 100*0.1 = 10 mmol
HRXN = -596.61/10 = -59.661 kJ/mol
nearest vlaue is -60 kJ/mol