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A sample of an oxide of lead (oxide A) weighing 4.7840 g is heated to drive off oxygen to form oxide B weighing 4.5704g.Further heating at high temperature removes more oxygen to give oxide C weighing 4.4639g and containing 92.8% of lead.
What is the empirical formula of oxide A,B, and C?
Two electrons that are found in the same atom have different quantum number sets. One of the electrons has the quantum number set (2, 1, -1, + 1/2), and the other has the quantum number set (2, 1, -1, -1/2). They share which one of the following?
What is the mass loss during the reaction? Assume 1 mol of 235U decays. Enter a positive number._________g
you have an unknown which may or may not be a hydrocarbon. it gives a negative test with br2chcl3 but decolorizes
Problem- The vapor pressure of toluene is 8 kPa at 40.3 C and 2.67 kPa at 18.4 C. Calculate (a) the heat of vaporization and (b) the vapor pressure at 25 C.
On the basis of this data, draw the structures of compounds A to E. Show your work for full credit.
A sample of neon is collected at 2.7 atm and 12.0 C. it has a volume of 2.25L.What would be the volume of this gas at STP?
How many milliliters of 1.00 M KOH should be added to 100 mL of solution containing 10.0 g of histidine hydrochloride
Calculate the molecular weight of gas if 3.85 grams of it occupies 175 milliliters at 695 mmHg and 115 degree centigrade
A solution of potassium chromate is prepared at pH 7.72. Calculate the fraction of the total chromate in this solution that is present as the chromate ion CrO42-.
Write a blance equation with Cu, NaI, I2, and a drop of acetic acid to form CuO and CuCO3.Cu(OH)2.
A cup of brewed coffee is made with 9.0 grams of ground coffee beans. If a student drinks four cups of gourmet coffee a day, how much does the student spend on a year's supply of gourmet coffee that sells for $8.99 a pound
how much current is produced by the dissolution of .525 g of chromium per hour to produce chromium (III)?
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