150.0 mL of 2.00 M Pb(NO3)2 solution is mixed with 300.0 mL of 2.00 M NaI solution in a coffee cup calorimeter of negligible heat capacity.

The initial temperature of the two solutions are both at 20.00 oC, the final temperature of the mixed solution is 36.09 oC.

c of H 2O = 4.184 J/g oC ; d of solution is 1.00g/mL. Refer to the following:
Pb(NO3)2(aq) + 2NaI (aq) --> PbI2(s) + 2NaNO3(aq)
What is q of the water? Please watch units. Answers have units of kJ. You have to convert J to kJ.

-1790 kJ/mol

42.9 kJ/mol

- 451 kJ/mol

30.3 kJ/mol

20.9 kJ/mol

91.7 kJ/mol

85.4 kJ/mol

2h2s + 3o2 2so2 + 2h2o which option gives the correct mole ratios? h2s: so2 = 2: 2 and o2: h2o = 3: 2 h2s: so2 = 2: 3 and o2: h2o = 3: 2 h2s: so2 = 4: 4 and o2: h2o = 5: 4 h2s: so2 = 4: 6 and o2: h2o = 4: 4

Iam in desperate need of with this !

Salicylic acid is a very important acid. it is used to synthesize the aspirin by treating with acetic anhydride. a 0.2015-g sample of salicylic acid was dissolved in a 100.00-ml volumetric flask, and the solution was diluted to the mark. a 10-ml aliquot of this solution was titrated with standard naoh (0.01130 + 0.2% n) to a phenolphthalein faint pink color end point at 19.81 ml. (a) (calculate the normality of the salicylic acid solution used in the titration. (b) assuming the salicylic acid is pure, what is the equivalent weight of the salicylic acid? practice problems for the final exam (continued) (c) (calculate the inherent error in the determination of the equivalent weight you calculated in part (b). use the following absolute errors in the equipment /glassware when calculating the inherent error. 5.00-ml pipet: + 0.02 ml 100-ml volumetric flask: + 0.08 ml analytical balance: + 0.2 mg 25-ml buret: + 0.03 ml