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Combustion analysis of 45.62 mg of an unknown organic substance compound produces 35.67 mg of H2O and 152.5 mg of CO2. What is the empirical formula of the compound?
A 100 mL stock solution contains 4.1 M Na3PO4. When 31 mL of the stock solution is diluted to 73 mL, how many moles of Na+ ions will be contained in the dilute solution
What are the differences between physical and chemical reactions in chemistry and what are the characteristics that make elements different from compounds? Give two examples of each that exist in the human body and explain their function.
Phenol is an enol. in water it wil undergo an enol to a keto tautomerization. Will this reaction likely go by a base or acid catalyzed mechanism? Show the mechanism
Use Coulomb's law to calculate the ionization energy in kJ/mol of an atom composed of a proton and an electron separated by 80.0 pm
The cyanide ion, CN-, binds to the iron that red blood cells use to carry oxygen around the body, therefore interfering with the blood's ability to deliver oxygen to the tissues. It is this toxicity that has made the use of sodium cyanide in gold ..
A piece of dry ice, solid CO2, weighing 10.0 g is placed in an evacuated 0.800 L bottle at 550 degrees Celsius. The bottle is capped, and the dry ice changes to gas. What is the final pressure inside the bottle
PbCO3(s)+2H^+(aq)+2H^+(aq) yields Pb^2++H20(l)+CO2(g), how many grams will dissolve when exactly 4.5 L of 2.00 M H+ is added to 3.00 g of PbCO3
A tank is first evacuated, and then connected to a 75.0 L cylinder of compressed nitrogen gas. The gas pressure in the cylinder, originally at 15.8 atm, falls to 1.05 atm without a change in temperature. What is the volume of the tank?
How many liters of H2 would be produced if you started with 24.3 g of M
The density of a salt solution is 1.13 gm/cm3. The solution contains 17.0% sodium chloride by weight (there are 17 gm of NaCl for every 100 gm of solution) . What volume of solution will contain 35.0 gm of NaCl
A 50.0 gram sample of water is heated from 21.5oC to 26.21oC. Explain how many Joules of heat were added to this solution
What's a front and what are factors and conditions associated with a cold front?
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