Enthalpy of vaporization of a liquid
The vapor pressure of a liquid in the temperature range 200 to 260K was found to fit the expression ln( P/torr) = 16.255 - (2501.8 / T/K) Calculate the enthalpy of vaporization of the liquid. Physical Chemistry IRa N. LEvine Chapter 8
Critical constants of a gas with van der Waals parameters
Estimate the critical constants of a gas with van der Waals parameters a= 1.32 atm L^2/mol^2 b = 0.0436 L/mol I believe the critical constants are Vm = 3b T = 8a/(27Rb) P = a/(27b^2) Van der Waals gas I know to convert 1.32 atm*L^2/mol^2 into something with cm^3 for a, and then plug into each equation. b wo ...continues
A saturated solution of Na2SO4 with excess of the solid is present in equilibrium with its vapor in a closed vessel. Calculate the number of degrees of freedom, f, of the system. Ignor the autoprotolysis of water and assume that the salt solvates without ionizing. F = c - p +2 or use f = c-p +2 -r -a c = chem species ...continues
Electromagnetic radiation and wave motion
In class my teacher explained how a pulsar in the crab nebula, NP 0532 emits both radio and optical pulses. A radio pulse is observed at 196.5 Mhz then she said calculate the corresponding wavelength, the energy of the photon, and the momentum? I didn't know how to do this.
The potassium spectrum has an intense doublet with lines at 766.494 nm and 769.901 nm. Calculate the frequency difference between the 2 lines?
Spring associated with force and velocity
a MASS OF 0.2 KG IS ATTACHED TO A SPRING HAS A PERIOD OF VIBRATION OF 3.0 SECONDS WHAT IS THE FORCE CONSTANT OF THE SPRING? AND IF THE AMPLITUDE OF VIBRATION IS 0.010M WHAT IS THE MAX VELOCITY?
Ian eats too many mars bars. To try to get rid of the excess kJ's he exercises in the gym by using a weights machine which works by compressing a cylinder of gas. If a standard mars bar is approximately 1000kJ. Calculate the number of times Ian has to push the piston in the cylinder up and down to 'burn off' a mars bar. Assume ...continues
A meteorological balloon of radius 1.0M at sea level and 20 degrees C. At it's maximum altitude the radius of the balloon is 3.0M and the temperature is -20 degrees C. Calculate the pressure inside the balloon.
How reliable is the perfect gas law in comparison with the van der Waals equation? Calculate the difference in pressure of 10.00g of CO2 confined to a volume of 100cm3 at 25 degrees Celsius between treating it as a perfect gas and a van der Waals gas. Parameters for CO2 a=3.61 atm dm6 mol-2 b= 4.29 10-2 dm3 mol-1
Theoretical Methods (Maths/Chemistry)
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