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A 0.100L sample of a solution containing an unknown concentration of sodium hydroxide requires 22.7 ml of 1.00 M sulfuric acid to completely neutralize. What is the concentration of the sodium hydr
The solubility of Zn(OH)2 is 2.0 x 10-6 M at a certain temperature. Determine the value of the Ksp at this same temperature.
Bone was dissolved in hydrochloric acid, giving 45.0 mL of solution containing calcium chloride, CaCl2. To precipitate the calcium ion from the resulting solution, an excess of potassium oxalate was
Starting with 50.0 g of CaCO3(s) and 100 mL of 1 M HF, how many moles of CO2 can be produced?
A 25.0 mL sample of river water was titrated with 0.00100 M Na2Cr2O7 and required11.5 mL to reach the end point. What is the COD, in mg O2 per litre of the sample?
particular sample of pure iron requires 0.595 kJ of energy to raise its temperature from 25oC to 45oC. The specific heat of iron is 0.45 J/g oC. What must be the mass of the sample?
When separated from a water solution, CuSO4 forms a hydrate with 5 water molecules per formula unit. If 38 g of anhydrous CuSO4 are dissolved in water, what mass of the hydrate could be recovered f
A sample of gas is collected over water at a temperature of 35.0?C when the barometric pressure reading is 625 torr. What is the partial pressure of the dry gas, given PH2O = 42.2 torr?
A solution is made by dissolving 31.0 g of NaOH in approximately 450 mL of water in a volumetric flask. The solution becomes quite warm, but after it is allowed to return to room temperature, water
Calculate the quantity of heat in calories release when 241.62 g of water is cooled from 80.6°C to 28.0°C.
If a 100.0 g sample of water at 60.0 degreesC is added to a 100.0 g sample of water at 10.0 degrees C, determine the final temperature of the water.
A gas is placed in a storage tank at a pressure of 20.0 atm at 20.3 DEGREES CELSIUS. As a safety device, there is a small metal plug in the tank made of a metal alloy that melts at 125 DEGREES CELS
A 62g piece of ice at 0 degree celsius is added to a sample of water at 9 degree celsius. All of the ice melts and the temperature of the water decreases to 0degree celsius. How many grams of water
A gas is compressed in a cylinder from a volume of 20 L to 2.0 L by a constant pressure of 10 atm. Calculate the amount of work done on the system.
What mass of sodium chloride would need to be added to the blood to bring the sodium ion concentration up to 0.140m, assuming no change in blood volume?
At 25.0°C, a sample of Xe gas occupies 509 mL in a piston-cylider apparatus when the external pressure is 356 torr. At what pressure (torr) will its volume become 770 mL if the temperature does
What volume of oxygen at STP will be needed to react 3500 L of CO measured at 20 degrees C and a pressure of 0.953 atm?
An experiment requires 42.0 of ethylene glycol, a liquid whose density is 1.114 . Rather than weigh the sample on a balance, a chemist chooses to dispense the liquid using a graduated cylinder. What
Determine the molar amounts of NO, O2 and NO2 after a complete reaction. NO=? O2=? NO2=?
If the two flasks are connected through a stopcock and the stopcock is opened, what is the partial pressure of helium?
6NO2+2H2O=4(HNO3)+2NO. For this equation, how many grams of nitrogen dioxide are needed to react with 3.70mol of H2O? How many grams of nitrogen monoxide are produced when 2.18mol of H2O react? If 6
A solution containing Pt4+ is electrolyzed with a current of 3.50 A. How long will it take to plate out 80.% of the platinum in 0.50 L of a 0.010 M solution of Pt4+?
What volume of 0.240 M CaCl2 must be added to 335 mL of 0.189 M KCl to produce a solution with a concentration of 0.245 M Cl-? Assume that the solution volumes are additive.
Assume you prepare the sample corresponding to line 1 in the first table of the Calculations section. If the measured concentration of I3- turns out to be 1.30x10-5 M, what is the equilibrium coeffi