Determine the specific volume of nitrogen at 100 atm/145K. Given for nitrogen

Pc = 3390 kPa, Tc = 126.2 K. Calculate P and compare it with the one

obtained by using the van der Waals equation.

Pc = 3390 kPa, Tc = 126.2 K. Calculate P

Determine the specific volume of nitrogen at 100 atm/145K. Given for nitrogen

Pc = 3390 kPa, Tc = 126.2 K. Calculate P and compare it with the one

obtained by using the van der Waals equation.

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Answer:Predict which of the substances,

NH3, N2, CH2Cl2, Cl2, CCl4 has

(i) the smallest van der Waals “a” constant

(ii) the largest “b” constant.

￼3

(i) Using Van der Waals equation, calculate the temperature of 20.0 mole of helium in a 10.0 litre cylinder at 120 atmosphere pressure.

[Data – Van der Waals constants for helium: a = 0.0341 L2 at mol-2; b = 0.0237 L mol-1]

(ii) Compare this value with the temperature calculated from the ideal gas equation.

￼4

A particular reaction in the gas phase has an activation energy of 8.000 kJ mol-1.

For 1.00 mole of gas, calculate the number of molecules which exceed this activation energy at

(a) 300 K

(b) 400 K

￼5

At 250 K, the activation energy for a gas phase reaction was determined to be 6.500 kJ mol-1.

What percentage of gaseous molecules would be expected to have less than this energy at 250 K?

￼6

For 1.00 mole of a particular gas, the average molecular energy is found to be 1.300 kJ mol-1 at 298 K. Approximately how many molecules have at least five times the average molecular kinetic energy.