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A 3.12 g sample of solute is dissolved in 35.0 g of water. The freezing point of this solution is found to be -1.23°C. What is the molar mass of the solute? For water, Kf = 1.86 degkg/mol.
If 0.11 g of H2O2 decomposes in a 2.50 L flask at 25 degrees Celcius, what is the pressure of O2 and H2O?
A 0.100 molal solution of a non-electrolute in water raises the boiling point of the resulting solution by 0.052 degrees. What will be the boiling point of a 0.100 molal solution of Na3PO4?
What is the relationship between vapor pressure, atmospheric pressure, and the boiling point of a liquid?
What is the magnitude and sign of the molar heat of vaporization of butane? Explain using Hess's law. Is your sign for the heat of vaporization realistic? Explain.
A chemical reaction takes place in a container of cross-sectional area 100 cm^2. As a result of the reaction, a priston is pushed out through 10 cm against external pressure of 1.0 atm. Calculate t
The molar heat of fusion of aluminum metal is 10.79 kJ/mol, whereas its heat of vaporization is 293.4 kJ/mol. What quantity of heat would be required to vaporize 1.52 g of aluminum at its normal boili
Calculate the work done when the gas expands isothermically against a constant external pressure of 210 Torr until it's volume has increased by 3.5L, then calculate the work done if the expansion
What mass of P4(s) is required to completely consume 25L of H2(g) at 27 degrees Celcius and 0.976 atm in the presence of excess oxygen. Molar mass of P4 given at 123.88 g/mol. Molar mass of H2 given 2
What quantity of energy is required to break up exactly 6 mol of SO2(g) into its constituent elements?
For the reaction A → 2B, the reaction rate is equal to its rate constant of 0.447mol L-1min-1. Your value for [A]o= 0.50 M, what is the half-life of the reaction?
A 27.3 g sample of pure iron at 81 C is dropped into 56 g of water at 40 C. What is the final temperature of the water-iron mixture?
A sample consisting of 1.00 mol of perfect gas atoms, for which Cv,m = 5/2R, initially at P1 =1.00atm and T1= 300k, is heated reversibly to 400K at constant volume. Calculate the final pressure, de
A solution of alcohol, C2H6O in water has a molality of alcohol of 3.25 mol/kg. In this solution, what is the percent by mass of the alcohol?
A 455-g piece of copper tubing is heated to 89.5 Celcius and placed in an insulated vessel containing 159g of water at 22.8 degrees Celcius.
A simple cubic unit cell is composed of identical spherical particles with a diameter of 75 pm. What is the volume of the unit cell?
If 4.00 ml of 0.0250 M CuSO4 is diluted to 10.0 ml with pure water what is the molar concentration of the copper (II) sulfate in the diluted solution ?
If 1.0 volumes of 1.0 M solutions of sodium hydroxide and lead (II) nitrate are mized how many moles of product are produced?
Identify the compound(s) that act as acid(s) in the following equilibrium: NH4+ (aq) + CN- (aq) NH3 (aq) + HCN (aq)
When the object is pulled down and released, the band vibrates at a frequency of 2.08 s-1. Calculate the spring constant of this silicone band including units.
What will be the osmotic pressure of a solution when 4.5 x 10-5 mol of a solute is dissolved in 152.0 mL of solution at 300.0 K? R = 0.08206 Latm/molK
Question: You have a prepared buffer solution from benzoic acid, and its conjugate sodium benzoate. Ka = 6.3 x 10^-5 for B.A. If you have 750 mL of a .125M benzoic acid solution and add 19.5 G of so
A student removes the thermometer and stirring wire in part b of the experiment to add the naphthalene, and wipes them off, losing .50 mL of cyclohexane. What percent error will this introduce if th
Calculate the work w when 0.7 litre of an ideal gas at an initial pressure of 4.2 atm is expanded or compressed isothermally to a final volume of 4.2 litres into a vacuum. Give your answers in J.
At equilibrium, [A] = 0.420 M and [C] = 0.580 M. Calculate the value of the equilibrium constant, Kc.