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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.
Calculate the number of moles of H2O that will be produced by the reaction of .530 moles of solid Al(OH)3 with excess aqueous HClO3.
Calculate the freezing point depression and osmotic pressure at 25 degrees C of an aqueous solution of 1.0 g/L of a protein (mol wt= 90,000) if the density of the solution is 1.0 g/mL.
Given the reaction 4Al(s) + 3O2(g) --> 2Al2O3(s), what is the minimum number of moles of oxygen gas required to produce 1.00 mole of aluminum oxide?
A gaseous mixture of and contains 32.8 nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 245 ?
The dipole measured for is 0.380D . The bond distance is 161pm . What is the percent ionic character of the bond?
If the mass of the tablet analyzed from the previous question was 1.247 grams, what is the mass effectiveness of the tablet?
A solution to replace potassium loss contains 38 M/EqL each of K+ and Cl-. How many moles of K+ are in 2.0 L of the solution?
The radius of a iron atom is 124 pm. How many iron atoms would have to be laid side by side to span a distance of 1.71 mm?
What is the pH of the solution created by combining 11.50 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? mwith 8.00 mL of the 0.10 M HC2H3O2(aq)?
what is the volume of the bubble when it reaches the ocean surface where the pressure is 1.00 atm and the temperature is 18 C?
Three solutions are mixed to form a single solution. One contains 0.2 mol Pb(C2H3O2)2, the second contains 0.1 mol Na2S, and the third contains 0.1 mol CaCl2. Write net ionic equations for precipita
What is the maximum amount of O2 in grams that can be obtained from 2.00 x 102 g of nitroglycerin? B) What is the % yield if you actually generate 6.55g. C) Is this an exothermic or endothermic reac