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A50 ml lead nitrate solution, Pb(NO3)2 is mixed with a 50 ml solution of potassium chromate, K2CrO4 , and a yellow precipitate forms with a mass of 16.160 g. Since most potassium salts and nitrates are soluble in water, PbCrO4 must be the precipitate. The equation for this reaction is: Pb2+ + CrO4 2- -> PbCrO4.
Calculate the theoretical yield using the starting quantities of both reactants.
a. If a mint leaf is 12% methanol how much should be distilled? b. What temperature should the distillation take place-approximately?
potassium hydroxide to a 250 mL volumetric flask. What is the concentration of potassium hydroxide in moles per liter?
what mass of water must be removed from the air each time the volume of air in the room is cycled through the air conditioner? The vapor pressure from water at 30 C is 31.8 torr.
the net change in entropy of the system and surroundings considered together must be a positive quantity; (e) the entropy of the universe must remain constant.
the electron configuration [Kr]4d10 5s2? How many unpaired electrons are there in the ground state of this ion?
A compound contain 60.87% carbon, 4.38% hydrogen, and 34.75% oxygen then determine its empirical formula?
Suppose that a sample of gas occupies 162 mL of volume at 25C and a pressure of 291 torr. What would be the volume if the pressure were changed to 503 torr at 25C? Answer in units of mL.
Calculate the pH of a solution prepared by dissolving 0.15 of sodium benzoate and 0.3 of benzoic acid in water sufficient to yield 1L of solution.
What mass in kg of NH3 must be used to produce 1.8 106 kg HNO3 by the Ostwald process, assuming 100% yield in each reaction?
The total pressure of the container after the water condenses (5C) is .857 atm. What are the partial pressures of the 4 gases at 5C. e)What was the temperature of the container in Kelvin before it was cooled to 5C?
Consider a small lake, 0.4 mile across and 11 ft deep, that contains a total of 50 tons of dissolved oxygen. Calculate the BOD (i.e. calculate the amount of oxygen required to degrade the amount of organic waste given)
For which substances would you predict the highest boiling point? Answer with explanations as to why?
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