A toluene solution is blended with 25% mass of benzene. The vapor pressure of benzene and toluene at 25'C are 94.2 torr and 28.4 torr respectively. (a) Calculate the vapor pressure of each component, (b) total pressure of the above solution, and (c) the composition of the vapor in mass percent.
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32. Calculate the [H+]of the ammonium hydroxide solution from a pH of 10.63.
mol/L= ?
33. Display the ICE table used to calculate your experimental Kb for ammonium hydroxide based on your values.
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Natural gas consists of 60.0 mole% ethane and 40.0 mole% butane. The gas is stored in a 300 ft^3 tank at a pressure of 1500 psig, and a temperature of 220 F and sold at a cost of $0.15/lb.
a) Determine whether the ideal gas equation of state is a good approximation for the given conditions.
b) Estimate the cost to fill the tank using the compressibility-factor equation of state.
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compare the hardness of some metals with polymers
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1) Compare the solubility in water of similar size compounds like pentane, 1-propanol, and propanone. Which functional group(s) allow the compound to be soluble in water: alcohols, alkanes, and/or ketones? What do the functional groups of the more soluble compounds have in common? (What IMFs do they have with water that the insoluble function group doesn’t have)
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Propose a reason for why 2,4-DNP or semicarbazone derivatives usually precipitate out of their ethanolic solutions.
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At 1 bar, how much energy is required to heat 37.0 g of H2O(s) at −18.0 ∘C to H2O(g) at 119.0 ∘C?
q=
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If a solution containing 39.142 g39.142 g of mercury(II) nitrate is allowed to react completely with a solution containing 10.872 g10.872 g of sodium dichromate, how many grams of solid precipitate will form?
precipitate:
How many grams of the reactant in excess will remain after the reaction?
excess reactant:
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You add 7.25 g of ice at 0.00 C to 100 g of water at 80.0 C. What is the final temperature of the mixture at thermal equilibrium assuming no heat loss to the surroundings?
The specific heat capacity of liquid water is 4.184 J/gC and the enthalpy of fusion for water is 6.02 kJ/mol at 0.00C.
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| Hydrogen peroxide, H2O2H2O2, is used to disinfect contact
lenses.
2H2O2(aq)→2H2O(l)+O2(g)2H2O2(aq)→2H2O(l)+O2(g) You may want to reference (Page) Section 6.1 while completing this problem. |
Part A How many milliliters of O2(g)O2(g) at 27 ∘C∘C and 5.00 barrbarr can be liberated from 18.95 mLmL of an aqueous solution containing 3.00%% H2O2H2O2 by mass? The density of the aqueous solution of H2O2H2O2 is 1.01g/mLg/mL. |
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A reaction: A (aq) + B (aq) <-----> C (aq) has a standard free energy change of -3.05 kJ/mol at 25 C. What are the concentrations of A, B, and C at equilibrium if, at the beginning of the reaction, their concentrations are 0.30 M, 0.40 M, and 0 M, respectively?
A = ? M
B= ? M
C= ? M
How would your answer above change if the reaction had a standard free energy change of +3.05 kJ/mol?
A.) There would be no change to the answers.
B.) All concentrations would be higher.
C.) All concentrations would be lower.
D.) There would be more A and B, but less C.
E.) There would be less A and B, but more C.
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Classify these bonds as ionic, polar covalent, or nonpolar covalent.
K-Cl, H-Br, H-H
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A certain substance X has a normal boiling point of 101.5°C and a molar boiling point elevation constant Kb = 1.49 °C/m. A solution is prepared by dissolving some urea (NH2)2CO in 200 g of X. This solution boils at 104.4°C. What is the mass of urea that was dissolved in the solution?
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The normal freezing point of a certain liquid Y is -8.70°C, but when 24.17g of urea (NH2)2CO are dissolved in 550 g of Y, it is found that the solution freezes at -13.7°C instead. Use this information to calculate the molal freezing point depression constant Kf of substance Y.
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A 25.00 mL aliquot of solution has a concentration of 3.813 x 10-5 M, what is the concentration of the 50.0 mL solution the aliquot was taken from?
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1. In reviewing the Ontario Drinking Water Standards, how does your unknown compare with the standard? How much calcium chloride or distilled water would be needed to be added to make your sample compliant?
2.explain the process by which a water softener works, please include the regeneration process.
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