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If 15 grams of sodium sulfate were mixed with 7.5 grams of carbon, what maximum mass of sodium sulfide could be produced?
If the total mass of CO2 produced is 34.8 grams, what was the approximate mass of the methane in the original mixture?
Solid iron reacts with chlorine gas to produce iron(III) chloride. If 10.0 grams of iron reacts with excess chlorine gas and 18.5 grams of iron(III) chloride is produced, what is the percent yield
How many grams of CaCO3 are produced when you react 55.2 mL of 0.150 M Ca(NO3)2 with 0.655 grams of Na2Co3? How many grams of Na2CO3 remain unreacted? How many grams of Ca(NO3)2 remain unreacted?
When 1.150 grams of an unknown nonelectrolyte dissolves in 10.0 grams of water, the solution freezes at -2.16°C. What is the molecular weight of the unknown compound?
When 40.0g of ammonia and 50.0 g of oxygen are mixed and allowed to react, which is the limiting reagant? 4NH3 +5O2--> 4NO + 6H2O
Determine how you would make a 100ppb solution of riboflavin from a 50mg/L stock solution. Do the same for preparation of a 500ppb solution from a 50mg/L stock solution.
Nutritional tables give the potassium content of a standard apple as 159 mg. There are about 3 apples/lb. How many grams of potassium are in 45.75 kg of apples?
Thomas used equimolar amounts of diethylamine and alpha chloro-2,6-dimethylacetanilide in the preparation of Lidocaine. All the starting material reacted but failed to isolate any Lidocaine. Why?
It is valuable to know that 1 milliliter (mL) equals 1 cubic centimeter (cm^3 or cc). How many cubic centimeters are in an 8.00 oz bottle of cough medicine?
A solution is prepared by dissolving 2.86 grams of sodium chloride, 3.9 grams of ammonium sulfate, and 0.896 grams of potassium iodide in 246 grams of water. Calculate the total mass of the soluti
After heating, the remaining solid weighed 0.432 g. Assuming all the CaCO3 broke down to CaO and CO2, calculate the mass percent of CaCO3 in the original mixture.
Lidocaine is used as a drug during heart attacks to correct irregular heart rhythms called pvcs. The normal dosage is 1.5mg/kg/hour. How much lidocaine would a 264 lb man receive in 218 minutes?
Calculate the actual van't hoft factor for this mixture. About how much of the HNO2 is dissociated and explain how you know this, based on the calculated value of i.
How many grams of the tablet should be used to provide 75.0 mg of CaCO3? How many mg Ca are contained in the partial tablet?
A 0.5118 g sample of CaCO3 is dissolved in 6 M HCl, and the resulting solution is diluted to 250.0 ml in a volumetric flask. What is the molarity of the Ca2+ ion in the 250 ml of solution?
The order reads 12,000 units of heparin for your patient. The vial on hand is labeled 10,000 units per cc. How many cc should the patient receive?
It gives a negative test with Br2/CHCl3, but decolorizes KMnO4. (Both results are correct.) What can you infer about your unknown?
Nitrogen and oxygen form an extensive series of oxides with the general formula NxOy. What is the empirical formula for an oxide that contains 30.44% by mass nitrogen?
Calcium reacts with oxygen to make calcium oxide, CaO. What is the maximum mass of CaO(s) in grams that could be prepared from 9.12 g of Ca(s) and 2.03 g of O2(g)?
The experiment is performed with hexane. A final weight for the gas of 0.31 grams is obtained. What is the value for n to be used in the gas law calculation?
How many mmol of acetic acid (HC2H3O2) are required to react with the NaOH? If your titration solution is 0.424 M in NaOH, and the endpoint occurs at 13.50 mL of titrant.
In the northern states during winter, "salt" is sprinkled on roads to reduce the formation of ice. What chemical principles are involved in the process?
A titration is performed on 1.3245g of a sample of a diprotic acid that is dissolved in 50 ml of water. if 44.10 ml of .6124 M NaOH is required to reach the end-point, what is the molecular weight o
If the unit of measurement were changed to grams of cholesterol per milliliter of blood, what would a cholesterol reading of 185 kg/dl translate to?