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1) A non-volatile solute depresses the freezing point of cyclohexane by 4.0 degrees Celsius. If cyclohexane has the formula C6H12, calculate the mole fraction of solute and solvent present in the solution.
2) The vapor pressure of pure cyclohexane is 32.0 torr at itsfreezing point of 5.5 degrees Celsius. Calculate the vapor pressureof the solution using #1 at this temperature.
What range of pH is suitable for this kind of buffer? Calculate the ratio of phosphoric acid to phosphate to gice you pH .= 6.8
a solution is known to contain bi3 ion or cd2 ion or both. describe the tests that could be used to seperate and
What is the mole fraction of helium, XHe, in a gaseous mixture of He and Ar for which the average molar mass is found to be 8.75g/mol
used in high speed centrifuges to separate the parts of a biological cell. How many liters of 3.07 M sucrose contain 245 g of solute?
Calculate the pH of this solution. recall that ascorbic acid is a diprotic acid. the first and second acid dissociation constants are 7.9X10^-5 and 1.6X10^-12.
To prepare a fertilizer, an engineer dilutes a stock solution of sulfuric acid by adding 23.0 L of 4.75 M acid to enough water to make 500. L. What is the mass of sulfuric acid per milliliter of the diluted solution
At a pressure of 1 atmosphere and a temperature of 25 °C, 500 cm3 of the gas HX has a mass of 0.400 g. Calculate the value of the relative atomic mass of X and hence identify element X.
Calculate the lower heating value of the Brookeville Seam coal with the analysis given below with 10, 20, 30, 40, and 50% moisture contents . Comment on the percentage of the heat loss based on the gross or high heating value of the fuel in using ..
Consider the titration of a 25.0 mL sample of 0.100 M HC2H3O using 0.100 M NaOH as the titrant. Ka=1.8 x 10^ -5. Calculate the pH of the analyte after 10.00 mL of 0.100 M NaOH has been added. Use the Henderson-Hasselbalch equation.
Using the following equation for the combustion of octane (C8H18) , calculate the heat of reaction (enthalpy change) when 100.0 g of octane C8H18 reacts with oxygen in a combustion reaction. The molar mass of octane is 114.33 g/mole.
determine the partial pressures of each gases at equilibrium. b.determine the equilibrium constant at 350.15 K
The equilibrium constant at 427°C for the reaction N2(g) + 3H2(g) 2NH3(g) is Kp = 9.4 × 10-5. Calculate the value of ΔG° for the reaction under these conditions.
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