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A 2.48 L sample of He at 739 torr is mixed with 6.08 L of Ar at 325 torr both at 25 degrees C is placed in a 4.80 L container at 25 degrees C. What is the partial pressure in atm of He?
The weight of the purified caffeine is often much lower than the weight of the crude caffeine. Explain the reason why.
Calculat the freezing point of a solution containing 50.0 grams of kcl and 5500.0 grams of water the molal freezing point depression (kf) for water is 1.86 c/m
What concentration of sodium formate, NaHCO2, is needed for a buffer solution at a pH of 3.62, if it contains formic acid, HCO2H, with a concentration of 0.150 M.
if 69.5kj of heat is applied to a 1012g block of metal the temperature of the metal increases by 11.4 degrees celcius.
the solubility of znoh2 is 2.0 x 10-6 m at a certain temperature. determine the value of the ksp at this same
Strawberries contain about 15 wt% solids and 85 wt% water.To make strawberry jam, crushed strawberries and sugar are mixed in a 45:55 mass ratio, and the mixture is heated to evaporate water until the residue contains one-third water by mass.
What is the specific heat of lead if it takes 97.5J to raise the temperature of a 75.0g block by 10.1 degress celcius?
An isotonic solution contains 0.95% by mass per volume. Calculate the percent mass per volume for isotonic solutions containing each of the following solutes at 50 degree Celsius . Assume a van't Hoff factor of 1.9 for all ionic solutes.
Write the simplest balanced equations, and find the actual relative masses of the elements. Explain your reasoning.
Sketch a qualitative MO diagram for [Ni(NH3)6]2+ and identify the portion of the diagram considered by crystal-field theory. Imagine the ammonia ligands were all exchanged with a pi-donor ligand
8.0 moles of CO2 and 9.0 moles of H2O are places in a 5.0L vessel. When equilibrium is established, [C2H4]=0.45 M. Calculate Keq
The half-life of a chemical rxn is 8.00 minutes. Starting with a 0.500 M soln, APPROXIMATELY how much unreacted material would be remaining after 46 minutes
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