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The percent composition by mass of a compound is 40.0% carbon, 53% oxygen and the rest is hydrogen. find the empirical formula of the compound
Water has seeped through the pore spaces in the glass cup. 4. The relative humidity of the air near the glass cup is approaching 0 percent. 5. The dew point temperature was not reached.
When 20 mL of a 120 mL stock solution containing 2 M BaF2 is diluted to 80 mL, what is the concentration of F- in the new solution.
How many moles of naoh do you have to add to the solution in part a so that the ph will increase by 0.2?
Calculate the amount of work done against an atmospheric pressure of 1.00 atm when 500.0 g of zinc dissolves in excess acid at 30.0°C.
How do you calculate the mass of KHC8H4O4 (molar mass=204.44 g/mol) that reacts with 15mL of NaOH solution
how much money would you spend on gas in one week if gas costs 1.10euros per liter and your car's gas mileage is 39.0mi/gal ? Assume that 1euro=$1.26 dollars.
what volume(in mL) of 0.0887 M MgF2 solution is needed to make 275.0mL of 0.0224 M MgF2 solution.
Caffeine is made up of 49.5% C, 5.2% H, 16.5%O, and 28.9% N. A solution made up of 8.25g of caffeine and 100.0 of benzene (d=0.887g/ml) freezes at 3.03C. Pure benzene (kf=5.10 degrees C/m) freezes at 5.50C.
How many grams of urea [(NH2)2CO] must be added to 345 g of water to give a solution with vapor pressure 2.45mmHg less than that of pure water at 30 degrees Celsius?
Draw the major product for each of the following reactions. Make sure that you draw a major product that could be isolated, not just an intermediate or something that would be present only in low equilibrium population.
calculate the molality of this solution (in mol solute/kg solvent).
Calcium phosphate, silicon dioxide, and coke may be heated together in an electric furnace to produce phosphorus, as shown in the following equation: 2Ca3(Po4)2+6SiO2+10C=6CaSiO3+10CO +P4
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