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A 5.00 g sample of aluminum pellets (specific heat capacity = 0.89 J/C g) and a 10.00 g sample of iron pellets (specific heat capacity= .45J/C g) are heated to 100.0 C.
Describe the process that will result in the greatest amount of work done by the system with a constant external pressure and calculate w. What is the least amount of work done with no restrictions
How is the solubility of manganese(II) sulfide affected by the addition of aqueous potassium hydroxide to the system?
The pH of the resulting solution is 8.0. Then you add 40 mL of 1.0 M hydrochloric acid (HCl) to the solution. What is the new pH?
What is the molarity of a solution made by dissolving 0.0815 grams of Na2SO4 in enough water to form exactly 750. mL of solution?
The absorbance of the new solution was 0.500. What is the concentration of Cu2+ in the sample? State any assumptions you might make and pay attention to significant figures.
Caffeine is a stimulant found in coffee and tea . A solution of caffeine in chloroform as a solvent has a concentration of 7.90×10-2 . Calculate the percent caffeine by mass.
A dead alkaline battery is found to contain a compund of Mn and O. Its analysis gives 69.6% Mn and 30.4% O.
In a controlled greenhouse at 30.0ºC and 1.0 atm, a crop of seedling tomato plants was found to consume 380 L of carbon dioxide gas during photosynthesis.
At room temperature (20), milk turns sour in about 65 hours. In a refrigerator at 3, milk can be stored three times as long before it sours. What is the activation energy of the reaction tht causes
Calculate the energy of the lowest energy photon that B4+ could absorb, if it is in its ground state. In no more than a couple of sentences, explain the circumstances in which some hydrogen-
What is the pressure in millimeters of mercury of 0.0110 of helium gas with a volume of 214 at a temperature of 50
A mixture of Ar and N2 gases has a density of 1.592 g/L at STP. What is the mole fraction of each gas?
A balloon filled with helium gas has a volume of 361 mL at a pressure of 1atm. The balloon is released and reaches an altitude of 6.5km, where the pressure is 0.5atm. Assuming that the temperature h
What are possible sources of error that might lead to an erroneous determination of the concentration of the acetic acid during quantitative titration?
what is the freezing point of a solution made by dissolving 42.392g of anthracene (C14H10) in 150.0mL of toluene?
What is the approximate concentration of the solutionapproximate concentration of the solution in {rm mol}/{rm kg}, if 1 {rm mol} of solute particles raises the boiling point of 1 {rm kg} of solvent b
The rate constant for a certain reaction is = 8.60×10-3 . If the initial reactant concentration was 0.850 , what will the concentration be after 13.0 minutes?
Someone investigating the properties of solutions containing carbonate ions prepared a solution containing 5.639g Na2CO3 in a flask of volume 250m
Calculate the pH of a solution formed by mixing 250.0 mL of 0.15 M NH4Cl with 100.0 mL of 0.20 M NH3. The Kb for NH3 is 1.8 x 10-5.
Calculate the formal concentration of a sodium acetate solution prepared by diluting 45.0 mL of a solution containing 25.0 ppm sodium acetate (NaC2H3O2) to a total of 0.500 liters of solution.
Hydrogen bromide can be produced by a reaction among bromine, sulfer dioxide, and water as follows.S02 + Br2 +H2O (arrow) 2HBr + H2SO4 If 250 grams of SO2 and 650 grams of Br2 react in the presen
The rate of effusion of a particular gas was measured and found to be 24.0 mL/min. Under the same conditions, the rate of effusion of pure methane (CH4) gas is 47.4 mL/min. What is the molar mass of
A layer of iron(III) oxide forms on the nail, increasing the nail's mass. How much oxygen has reacted with the iron if the mass of the nail has increased to 5.89 g?
Did the acids and bases exactly neutralize each other? if not, calculate the concentration of excess H+ or OH- ions left in the solution.