Chemistry, 21.01.2021 22:30 kdcupcake8004
Determine the mass fraction of O2 and N2 in air, assuming the molar composition is 21 percent O2 and 79 percent N2.
Answers: 3
Chemistry, 21.06.2019 21:00
Write two balanced equations 1. dissolving of solid sodium hydroxide in water 2. the reaction of sodium hydroxide solution with hydrochloric acid
Answers: 1
Chemistry, 22.06.2019 05:40
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
Answers: 2
Chemistry, 22.06.2019 06:00
When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change?
Answers: 3
Chemistry, 22.06.2019 22:30
Rank the four gases (air, exhaled air, gas produced from from decomposition of h2o2, gas from decomposition of nahco3) in order of increasing concentration of co2
Answers: 1
Determine the mass fraction of O2 and N2 in air, assuming the molar composition is 21 percent O2 and...
Mathematics, 28.04.2021 20:40
Mathematics, 28.04.2021 20:40
Mathematics, 28.04.2021 20:40
Mathematics, 28.04.2021 20:40
Mathematics, 28.04.2021 20:40