Physical Chemistry Answers

Q1) N2 (9) + 3H2(9) - 2NH3 (9)

Assume K=6, for initial concentration of hydrogen and ammonia at 4 and 0.2 moles,

respectively. Calculate for what initial value of nitrogen concentration, the extent of reaction

will be the highest.

The reaction 2Al(s)+3Cl₂(g)→2AlCl₃(s) has Δ_rH°<0 and Δ_rS°<0. Is this

Always spontaneous

Spontaneous at low temperatures

Spontaneous at high temperatures

Never spontaneous

How many grams of Ag2S will form when 3.94g of AgNO3 And an excess of Na2S are reacted together?  

The volume of an aqueous solution of NaCl at 25 °C was measured at a series of molalities b, and it was found that the volume fitted the expression v = 1003 + 16.62x + 1.77x3/2 + 0.12x2 where v = V/cm3 , V is the volume of a solution formed from 1.000 kg of water and x = b/bº. Calculate the partial molar volume of the components in a solution of molality 0.100 mol kg–1 

• Compute the difference between molar specific heat capacities for ideal gases                      
• Ratio  (γ ) for the two principal specific heats of monatomic and diatomic gases respectively

 A diesel engine does not use spark plugs to ignite the fuel and air in the cylinders. Instead, the temperature required to ignite the fuel occurs because the pistons compress the air in the cylinders. Suppose that air at an initial temperature of 21 ^oC is compressed adiabatically to a temperature of 688 ^oC. Assume the air to be an ideal gas for which = 7/5

 Find the compression ratio, which is the ratio of the initial volume to the final volume. 

One Faraday of electricity is equal to

Why there was a need for introducing the term activity?

An ideal gas with a volume of 0,1 m³ expands isobarically at a pressure of 1,5 x10⁵ Pa

          to a treble volume .

(a)    Draw a labelled sketch for a PV diagram for this thermal process                                

(b)   Which quantity is represented by the area under the PV diagram                               

(c)  Calculate the work done by the gas in kilojoules

a 10.00 gram sample of the hydrated salt cacl2. x.h2o was thermally decomposed by anhydrous calcium chloride and water vapours find the no. of water molecules in the salt