1. Resolver: a) Se tiene 2 moles de CO2. Hallar la masa.
b) Se tiene 200g de NaOH. Hallar sus moles.
c) Se tiene 3 moles de NH3. Hallar su masa.
d) Se tiene 80g de CH4. Hallar sus moles.
2. Determine el número de Mol-g en 800 g de CaCO3.
(Ca = 40, C = 12, O = 16) PORFAVOR, ayúdenme con estas 2 preguntas.

The first element on the periodic table of elements is carbon. a. true b. false

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

Asample of hydrated tin (ii) chloride (sncl2) has a mass of 4.90 g. when it is dehydrated, it has a mass of 4.10 g. which is the correct chemical formula for the hydrate? sncl2•2h2o          sncl2•4h2o          sncl2•6h2o