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If 4.12g of (NH4)2SO4 (all numbers are subscripts) is dissolved in enough water to form 220mL of solution, what is the molarity of the solution?
What is the maximum number of electrons in an atom whose highest-energy electrons have the principal quantum number n=5
For the reaction N2(g)+O2(g) >>> 2NO2(g), Kc=8.3X10^-10 AT 25*C. What is the concentration of N2 gas at equilibrium when the concentration of NO2 is five times the concentration of O2 gas
What two predominant effects govern most chemical reactions and properties? What are the two major types of computational approaches used to model chemicals
A system absorbs 198kJ of heat and the surroundings do 120kJ of work on the system. What is the change in internal energy of the system
How many liters of hydrogen gas are formed from the complete reaction of 1.06mol of C? Assume that the hydrogen gas is collected at a pressure of 1.0 atm and temperature of 325K? Using C(s)+H2O(g)=CO(g)+H2(g)
A mixture of NaCl and NaBr has a mass of 2.05 and is found to contain 0.72g of Na. What is the mass of NaBr in the mixture?
A 100g sample of water at 27oC is poured into a 76.2g sample of water at 89oC. What will be the final temperature.
For a chemical system at equilibrium, the forward and reverse rates of reaction are equal. 3. For an aqueous chemical system at equilibrium, the concentrations of products divided by the concentrations of reactants equals one.
Would using sulfuric acid instead of hydrochloric acid with zinc metal change the outcome of the reaction
A flask contains 400 ml of .5 M phosphate buffer that has a ph of 7.5 What volume of .1 M HCl should be added to drop the ph to 7.1
An evaluation of R was performed, following the procedure described in this module. The barometric pressure was 736 torr, the temperature was 295 K, and the volume of hydrogen gas collected was 35.6 mL. The calculated value of R was 82.1mL atm K-1..
If an unknown quantity of gas at a pressure of 1.2 atm, a volume of 31 liters, and a temperature of 87 C
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