determine the molecular formulas for compounds having the following empir-ical formulas and molar masses: a. c2 h4 s; experimental molar mass 179 b. c2 h4 o; experimental molar mass 176 c. c2 h3 o2 ; experimental molar mass 119 d. c2 h2 o, experimental molar mass 254

What is avogadro’s number, and why is it useful

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

Calculate the mass of carbon in 97.0 g of sucrose c12h22o11