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Bone was dissolved in hydrochloric acid, giving 50.0 mL of solution containing calcium chloride, CaCl2. To precipitate the calcium ion from the resulting solution, an excess of potassium oxalate was added. The precipitate of calcium oxalate, CaC2O4, weighed 1.437 g. What was the molarity of CaCl2 in the solution?
How many grams of glucose are needed to prepare 400 g of 2% m/m glucose solution 2) how many moles of cacl2 are in 250 ml of a 3 m of cacl2 solution
liquid octane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water. suppose 74 grams of octane is mixed with 148 grams of oxygen
What is the pH of the resulting solution if 15.0 ml of 0.450M NaH2PO4 is mixed with 20.0 ml of 0.350M Na2HPO4?
what is the molecular formula of a compound that contains 28.2% of potassium ,25.6% of chlorine and 46.2% of oxygen ? the molar mass is 138.5u.
A gas expands against a constant external pressure of 2.1 bar until its volume has increased from 4.8 L to 7.9 L. During this process it absorbs 590.0 J of heat from the surroundings. Calculate the energy change of the gas.
How many minutes will it take to electroplate 46.1 g of gold by running 5.00 A of current through a solution of Au+(aq)? Express your answer to three significant figures and include the appropriate units.
While making a methyl butanoate ester, and after we were done heating it up, we filtered it with water and NaHCO3. What gas escaped during the sodium bicarbonate washing?
A 13.7g sample of an unknown gas occupies 15.5L at a temperature of 17 CELSIUS and a pressure of 743 mmHg. What is the molar mass of the gas
want to synthesize 3-methyl-2-pentene from 2-chloro-3-methylpentane. Which reagent would you use
In an electrolysis experiment such as the one you will perform, 1.76 x 10^-3 moles of hydrogen gas were collected, and the metal electrode lost 0.1983 g. The equivalent mass of the metal is approximately what?
Calculate the frequency of the light emitted when an electron in a hydrogen atom
How many grams of CuSO4 5H2O are needed to prepare 100 ml of a .15 m solution CuSO4
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