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Dissolving 3.00 g of an impure sample of CaCO3 in an excess of HCl acid produced .656 L of CO2 (measured at 20 degrees C and 792 mmHg). calculate the percent by mass of calcium carbonate in the sample. State any assumptions.
A patient weighs 146 pounds and is to receive a drug at a dosage of 45.0 mg per kg of body weight. The drug is supplied as a solution that contains 25.0 mg of drug per mL of solution.
The temperature of a sample of water increases from 21.9°C to 45.3°C as it absorbs 5669 J of heat. What is the mass of the sample.
The absence of an alkene C=C IR stretch is definitive evidence that a compound lacks an alkene functional group.
A bicycle tire is filled with air to a pressure of 720 torr at a temperature of 19 degrees Celsius. Riding the bike on asphalt on a hot day increases the temperature of the tire to 58 degrees Celsius.
Pure metals are commonly recovered from sulfide ores by successive processes of roasting in air (oxidation), dissolution in sulfuric acid and electrolysis (reduction). Consider the starting ore mineral sphalerite (ZnS). Write balanced chemical rea..
What mass of this substance must evaporate in order to freeze 170 of water initially at 23? (The heat of fusion of water is 334 the specific heat of water is 4.18 .
Propose the structure of a conjugated diene (no more six carbons) for which 1,2-addition of HBr produces
calculate the number of moles of KOH in 5.50 mL of a 0.360 M KOH solution.What is the pOH of the solution?
A canister is filled with 390 of ice and 100 of liquid water, both at 0.0 . The canister is placed in an oven until all the has boiled off and the canister is empty. How much energy in calories was absorbed?
A 40.0 mg sample of a protein is dissolved in water to make 25.0 mL of solution. The osmotic pressure of the solution is 0.56 torr at 25°C. What is the molar mass of the protein?
What are the molecular weights of ether and dimethylether? Are they isomers of each other or is each an isomer of something else? Why are there significant differences in their chemical and physical properties?
What pH would you make the water layer in order to cause the acid to dissolve in the ether layer and the amine to dissolve in the water layer? d. How would you purify a mixture of benzoic acid, chlorobenzene, and cyclohexylamine?
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