Physical Chemistry Answers

"A four phase equilibrium is not possible in a one component system." Justify the statement.

Write the values of four quantum numbers for the electrons present in the following orbitals.

(i) 2p

(ii) 3d

(iii) 4f

when o.210gm of a compound containing only hydrogen and oxygen was burned,0.66ogm of co2 was recoverd.what is the emperical formula of the compound.the determination of the density of this hydrocarbon gave value of1.87gm/liter at 237k and 1atm.what is the molecular formula of the compound

A Laboratory assistant prepares 5 litres of 0.1N hydrochloric acid stock solution

using commercial HCl available in laboratory which has percentage purity of 35%

(w/w) and specific gravity of 1.18 g/ml. Then he fills five 100ml standard flasks with

50.0ml of 0.1N HCl solution and dilutes it with distilled water upto the mark. Then he

takes 10ml of diluted HCl solution from each flask into a conical flask, mixes it and

adds 50ml of 0.025M Sodium hydroxide solution to it. Finally, he adds few drops of

phenolphthalein to the resulting solution in the conical flask.

i) What was the concentration of HCl solution prepared in 100ml standard

flasks?

ii) What do you think will be the colour of the resulting solution after addition of

indicator?

iii) Calculate the pH of the resulting solution.

How many grams of the two products are formed if 10.0 moles of H2S04 is reacted with enough calcium phosphate [Ca₃(P0₄₎₂]?

Sulfuric acid (H₂S0₄₎ is used in the production of phosphate fertilizers.The reaction involved is

A Laboratory assistant prepares 5 litres of 0.1N hydrochloric acid stock solution using commercial HCl available in laboratory which has percentage purity of 35% (w/w) and specific gravity of 1.18 g/ml. Then he fills five 100ml standard flasks with 50.0ml of 0.1N HCl solution and dilutes it with distilled water upto the mark. Then he takes 10ml of diluted HCl solution from each flask into a conical flask, mixes it and adds 50ml of 0.025M Sodium hydroxide solution to it. Finally, he adds few drops of phenolphthalein to the resulting solution in the conical flask.

What was the concentration of HCl solution prepared in 100ml standard flasks?

What do you think will be the colour of the resulting solution after addition of indicator?

Calculate the pH of the resulting solution.

H2+O2=H2O

Create a Lewis Dot Symbols out of the given elements in each item. Take note of the electron charges of the elements .

1.) B2+

2.) Au+

3.) Ne3-

4.) Cu3-

Draw the energy diagram of the reaction: Na(s) + ½Cl2 → NaCl.

Enthalpy (kJ/mol)

     Na(s) → Na(g)                       +108

     Na_(g) → Na⁺_(g) + e                   +496

     ½ Cl₂ →Cl_(g)                            +121

     Cl_(g) + e → Cl^-_(g)                      -349