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A 300. mg sample of caffeine was dissolved in 10.0 g of camphor (Kf = 39.7 °C/m), decreasing the freezing point of camphor by 3.07 °C. What is the molar mass of caffeine?
If 38.7 g of a nonelectrolyte is dissolved into 218 g of water. The freezing point of the solution is measured to be -5.53 °C. Calculate the molar mass of the solute.
A mass glucose (C6H12O6) is 43.8g is dissolved into 359.9g of water. If the molal boiling point elevation of water is 0.51° C/m, what will be the change in the boiling point of water?
Camphor has a molal freezing point depression constant of 5.95°C/m. If you dissolved 10.0g of dimethyl ether ( C2H6O) into 3.00kg camphor, what will be the change in the freezing point of camphor?
Assume you have a 3.60 m solution that depressed the freezing point of the solution by 0.851°C. What is the molal freezing point depression constant (Kf) of the solution?
If you use 5.76mol of sodium fluoride (NaF) and dissolved this into 3.62 kg of water, what will be the change in the boiling point of your solution. Assume the Kb of water is 0.51°C/m.
1. A mole of N2 has a pressure of 2.30 atm inside a 20.0 L vessel. What is the volume that the gas occupies if it is compressed to a pressure of 8.45 atm at constant temperature?
2.A sample of air in a container was analyzed to contain 0.390 mol N2, 0.102 mol O2 and 0.0085 mol other gases. What are the partial pressures of these gases in the container if the total pressure is 754 mm Hg?
3.What is the mass of ethanol that must be combusted to generate 20.4 L of CO2 at STP?
4.F2(g) (M=38.00 g/mol) effuses through a pinhole at a rate of 0.01287 mol/s. At what rate does N2O4(g) (M=92.02 g/mol) effuse at the same pinhole?
Calculate the equilibrium concentration of the nonionized acids and all ions in a solution is 0.25 m in HCO2H and 0.10m in HCIO.
A scientist measures the standard enthalpy change for the following reaction to be -558.9 kJ :
H2CO(g) + O2(g)CO2(g) + H2O(l)
Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of H2CO(g) is
Calculate the solubility of Mg(OH)2 in 0.10 M NaOH. Calculate the solubility in grams/liter.
