When hno2 is dissolved in water it partially dissociates according to the equation hno2⇌h++no−2. a solution is prepared that contains 4.000 g of hno2 in 1.000 kg of water. its freezing point is found to be -0.1692 ∘c calculate the fraction of hno2 that has dissociated.

The degree of dissociation is 1

thus the fraction dissociated is one

Explanation:

The depression in freezing point is a colligative property and depends upon the number of solute particles present in the solution.

The relation between depression in freezing point and molality is:

For water

Kf=1.86 °C/m

Where

i= Van't Hoff factor

For electrolytes the i depends upon on the extent of dissociation

i = αn + (1 - α)

Where

α = is degree of dissociation

Let us put the values

Putting value:

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.