Physical Chemistry Answers

To derive the equation of the corresponding states using the reduced quantities.

4.60 × 10⁻³ kg of sodium chloride was dissolved in 0.130 kg of water at 280 K. The osmotic pressure of the solution was found to be 2.66 × 10⁶ Pa. To calculate the van't Hoff factor and the degree of dissociation. The density of the solution is 1.02 × 10³ kg m⁻³ and the molar mass of NaCl is 58.5 × 10⁻³ kg mol⁻¹.

To calculate the number average molar mass of a polymer sample with the following distribution of molar masses :
Nᵢ (Mᵢ/kg mol⁻¹)
5 1.000
10 2.000
10 50.000
10 10.000
5 20.000

Using the following equilibria
CH₃COO⁻ + H₂O ⇔ CH₃COOH + OH⁻
and CH₃COOH ⇔ H⁺ + CH₃COO⁻
show that K_h = (K_w/K_a)

To estimate the standard enthalpy of formation of acetone vapour. Given the following information :
B (H - H) : 436 kJ mol⁻¹
B (O = O) : 497 kJ mol⁻¹
B (C - H) : 412 kJ mol⁻¹
B (C - C) : 348 kJ mol⁻¹
B (C = O) : 745 kJ mol⁻¹, ∆_atom H (graphite) = 717 kJ mol⁻¹.

The boiling point of chloroform was raised by 0.30K when 5×10⁻⁴ kg of an organic compound was dissolved in 3×10⁻² kg of chloroform. To calculate the molar mass of organic compound. Molal elevation constant for chloroform is 3.9K kg mol⁻¹.

The edge length of a cubic unit cell is 5.63×10⁻¹⁰m. To find the distance between (111)planes.

A vessel of 2×10⁻³m³ volume contains 0.036 kg of Argon at 300K. Calculate its pressure using ideal gas equation. ( Atomic mass of Ar = 39.9u).

To calculate the entropy of fusion of benzene solid if its melting point is 280K and its enthalpy of fusion is 11kJ mol⁻¹.

How's the melting point of alkynes? Is is Increasing or decreasing?