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If the entropy of a collection of molecules in 50,000 boxes is 3.73E-20 J/K, how many molecules are there?
How many grams of propane must be burned to heat 180g of water from -15 degrees Celcius
To a second 25.00 mL part, 10.00 mg of lead was added and extracted into a second 10.00 mL portion of the same organic solvent. This solution gave A = 0.525. What was the concentration of lead, in mg/mL, in the original sample?
A voltaic cell is constructed by immersing a strip of silver in a 1.0M AgNO3 solution and a strip of cadmiun metal in a 1.0M Cd(NO3)2 solution. The circuit is completed by a wire and a salt bridge in the usual way. What is the cell potential for t..
ldentify whether or not the reaction would favor the reactants or produ€ts under the specified conditions, and identify whether K gets smaller or bigger
Calculating percent purity from a reaction, One of the reactions that occurs in a blast furnace, where iron ore is converted to cast iron is Fe2O3 + CO = Fe + CO2.
what is the mass in grams in 2.28 mol of each of the following: a) N2, b)SO3, c)C3H6O3, d)Mg(HCO3)2, e)SF6. Please use significant figures.
If the mass of water surrounding the calorimeter was exactly 1000 g and the heat capacity of the bomb calorimeter was 1.75 kJ/°C, calculate the molar heat of combustion of liquid methanol .
A 0.2527-g sample of a mixture of Mg(OH)2 and Al(OH)3 was treated with 50.00 mL of 0.225 mol L^-1 HCl(aq). The resulting solution required 13.73 mL of 0.176 mol L^-1 NaOH(aq) to neutralize the excess, unreacted HCl. What was the percentage by mass..
If 19.4 grams of an aqueous solution of sodium bromide, NaBr, contains 1.69 grams of sodium bromide, what is the percentage by mass of sodium bromide in the solution
The presence of the carbon-carbon double bond in eugenol can be tested using the bromine water test. write a balance equation for the reaction involved in this test?
Calculate the k value associated with the reaction at 25 degrees celcius given the Gibbs free energy of formation of N2H4 is -419.15Kj/mol
What is the change in pH after addition of 10.0 mL of 1.0 sodium hydroxide to 90.0 mL of a 1.0 M NH3/1.0 M NH4+ buffer? [ Kb for ammonia is 1.8 x 10^-5]?
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