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A compound contains only carbon, hydrogen, and oxygen. Combustion of 10.68 mg of the compound yields 15.48 mg CO2 and 7.39 mg H2O. The molar mass of the compound is 182.2 g/mol. What are the empirical and molecular formulas of the compound?
If the concentration of fluoride in fluoridated drinking water is 1 x 10 ^-5 M and the calcium ion concentration in blood is 2.5 x 10^ -3 M, why is there no danger of CaF2 precipitating in the blood stream, after drinking the water?
if 4.00 ml of 0.0250 m cuso4 is diluted to 10.0 ml with pure water what is the molar concentration of the copper ii
Ziram and fuberidazole are 2 weak bases, estimate what pH the water would need to be to drop their vapor pressure to 50% that of a solution of a free base
a fixed quantity of gas at 21 exhibits a pressure of 730 and occupies a volume of 4.40. use boyles law to calculate the
1.) What is the purpose of making derivatives of unknowns? 2.) Give three reasons why acetone might interfere with your results.
A solution was made by dissolved 2.0 g of an unknown non-electrolyte in 25 g of acetic acid. The solution boiled at 119.6 degrees C. Calculate the molar mass of the non-electrolyte.
What is the maximum mass in grams of NH3 that can be produced by the reaction of 1.0g of N2 with 3.0g of H2
if 18.6 of 0.800 solution are needed to neutralize 5.00 of a household ammonia solution what is the molar concentration
5 m3 open tank is used to mix two streams of liquid water. stream a enters at 90oc at a rate of 3 kgs. stream b enters
Why do oils and fats melt over a range of temperatures? How could you use this information to make a reduced-fat chicken stock or beef stock
Diethylamine, (C2H5)2NH, is a weak base (pKb=3.16 at 25oC). What is the pH of 0.155 mol/L (C2H5)2NH(aq) at 25oC
the density of phosphorus vapour at 310 degrees celcius and 75 mmHg is 2.64 g/L. What is the molecular formula of the phosphorous under these conditions?
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