Physical Chemistry Answers

At 2.00K the vapour pressure of liquid helium is 3173 PA and the heat of vaporisation is 92.048J/mol. Calculate the Lowest temperature which can be obtained by pumping on a a Dewar flask of liquid helium with a pumping system which will achieve an ultimate steady-state pressure of 133.32 PA. You may assume that the molar volume of the liquid is negligible and the vapour behaves like an ideal gas.

b) If the heat into the Dewar is 4.184J per minute, estimate the pumping speed in m^3 per minute at 133.32 PA and 309K ( temperature of gas at the pump).

Draw and explain the vapour pressure curve of a solution showing positive deviation from Raoult's law

A standard hard water contains 15 gm of CaCO3 per lite. 20 ml of this required 25 ml of EDTA solution. 100ml of sample water required 18 ml EDTA solution. The same sample after boiling required 12 ml EDTA solution. Calculate the temporary hardness of the given sample of water, in terms of ppm

At STP a certain mass of gas occupies a volume of 800cm3.find the temperature at which the gas occupies 940cm3 and has a pressure of 675mmHg

50 ml of water sample requires 18 ml of 0.05M EDTA, during titration whereas 50 ml of

boiled water sample requires 12.5 ml of same EDTA in the titration. Calculate total,

permanent and temporary hardness of water

A certain mass of H2 gas is collected over water at 23 degree Celsius and 765mmHg pressure calculate the p of the dry gas

7.23 × 1024 Al atoms =  [   ] grams Al

A galvanic cellis applied by the combination of fe rodimmersed in feso4 solution of concentration 0.25M

Assume that the area that a pheromone can be sensed is a cylindrical air space. Calculate the volume of this air space assuming a radius of 0.500 mi and a height of 40.0 ft.

A galvanic cell is constructed by immersely of cu rod in cuno3 solution of 0.01M and ag rod in agno3 solution of 0.1M