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(a) A 159 mL sample of 0.029 M NaCH3CO2(aq) is diluted to 0.548 L. What is the concentration of acetic acid at equilibrium?
(b) What is the pH of a solution resulting from the dissolution of 2.09 g of NH4Br in water to form 0.371 L of solution?
A certain mass of oxygen was collected over water when potassium chlorate was decomposed by heating. The volume of the oxygen sample collected was 720. mL at 25.0 oC and a barometric pressure of 755 torr.
how many grams of chlorine are required to react completely with 5.00grams of sodium to produce sodium chlorde ?
Sodium chlorate,NaClO3, decomposes when heated to yield sodium chloride and oxygen, a reaction used to provide oxygen for the emergency breathing masks in many airliners
Liquid tetraethyllead reacts according to the balanced equation. When 419 g of CO2 is produced, calculate the sign and magnitude (kJ) of the heat produced.
Calculate the density and radius of the ball bearing (volume of a sphere of radius r is 4/3pi r^3).
Glycerol is a water-soluble liquid with a density of 1.2656 g/mL at 15°C. Calculate the molarity of a solution of glycerol made by dissolving 60.000 mL glycerol at 15°C in enough water to make 300.00 mL of solution.
An indicator has a pKa of 5.7 . It is colorless in acid solution and deep green in alkaline solution.
A 35 mL sample of 0.150 M KOH is titrated with 0.125 M HClO4 solution. Calculate the pH after 30 mL of acid have been added.
Given a free energy change for a reaction of -0.125 kcal/mol, what is the equilibrium constant at 18 degrees C (r=8.314 J/mol*K)
A gaseous mixture of O2 and Kr has a density of 1.192 g/L at 305 torr and 300. K. What is the mole percent O2 in the mixture
Determine the mass of carbon dioxide (in g) produced from the complete combustion of 1.40×10-2 g of C6H10 with excess oxygen.
How many grams of nitrogen dioxide (NO2) are required to produce 260 grams of nitrogen monoxide, NO?
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