Other Chemistry Answers

An alloy from the National Bureau of Standards was analyzed for its chromium content and the following results were obtained: 2.61, 2.66, 2.61, 2.70, and 2.68% Cr. If the NBS certified value is 2.69% Cr, what is the absolute error? What is the percent error?

To deliver a certain volume from a baret requires two readings: initial and final. If each reading is made with an uncertainty of 10.02 ml, what is the relative uncertainty in dis pensing 30.00 ml. from a buret?

The chloride in a sample containing approximately 3.5 % NaCl is to be determined gravimetrically as AgCl. What weight of sample must be taken to obtain a precipitate that will weigh about 0.10 g?

For a particular CE experiment ueo = 1.3x10-8 m2 V-1 s-1. What will the migration time be for a neutral solute in a 52 cm capilllary under an applied field of 27 kV? In this experiment will you ever be able to detect an anion having uep = -1.6x10-8 m2V-1 s-1? Assuming the anion has a fixed charge, what could be altered so that the anion could be detected?

5.00 g of a nonvolatile compound was dissolved in 100 g of water at 30oC.The vapor pressure

of the solution was measured and found to be 31.20 Torr. The vapor pressure of pure water

at 30oC is 31.82 Torr. Calculate the molar mass of the unknown solute.

Use Raoult’s Law to determine the vapor pressure of an aqueous solution when 164 g of

glycerin (C3H8O3) is added to 338 mL of H2O at 39.8 °C. The normal vapor pressure of pure

H2O at 39.8 °C is 54.74 torr. Density of H2O at 39.8 °C is 0.992 g/mL