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One way to recrystallize a solute from a solution is to change the temperature. Another way is to evaporate solvent from the solution. A 340 g sample of a saturated solution of KNO3 in water is prepared at 25.0.
If 60 g H2O is evaporated from the solution at the same time as the temperature is reduced from 25.0 to 0.0, what mass of KNO3 will recrystallize?
Calculate the energy of an electron in the hydrogen atom when n = 2 and calculate the energy of an electron in the hydrogen atom when n = 6.
How many grams of KNO3 are needed to make 450 mL of a solution that is to contain 5.50 mg/mL of potassium ion? Calculate the molarity of the solution.
For the p-block elements, why are the d-orbitals not involved in the bonding process? But why are the d-orbitals involved in the bonding
Why is it uncenessary to include an aluminum trihalide in the electrophilic aromatic bromination reaction of acetanilide with molecular bromine?
Would a solution that has a molarity of 0.990 M KNO3 and a density of 0.988 g/mL be considered unsaturated, saturated, or supersaturated?
What is the molecular weight of the compound? (bpt ccl4 = 76.5 C, Kb = 5.03 C/m)
Consider the titration of a 24.0 ml sample of 0.120 M HC2H3O2 with 0.105 M NaOH. Determine the initial pH.
A sample of a refrigeration gas in a volume of 410 mL, at a pressure of 1.26 atm, and at a temperature of 11.0 °C, was compressed into a volume of 172 mL with a pressure
A thyroid condition called Goiter can be treated by increasing Iodine in the diet. Iodized salt contains Calcium Iodate, Ca(IO3)2, which is added to table salt.
The solubility of N2 in blood can be a serious problem (the "bends") for divers breathing compressed air (78% N2 by volume) at depths greater than 50 ft.
Atmospheric pressure decreases as altitude increases. In other words, there is more air pushing down on you at sea level, and less air pressure pushing down on you when you are on a mountain.
At an altitude of 30 km, the temperature in the stratosphere is approx. -45.3 degrees F. What is the average kinetic energy of a single CF2Cl2 molecule at this temperature?
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