Question

Q. Calculate the value of boiling point constant (K) for water. Given that the latent heat of vapourisation of water is 504 calg-¹ and R= 1.987caldeg ¹mol-¹. What does the value of K, signify?​

Answer 1

K = 0.116 deg/mol

Step-by-step explanation:

The boiling point constant (K) for water can be calculated using the following formula:

K = (R × T^2) / ΔHvap

where R is the gas constant (1.987 cal/deg/mol), T is the boiling point temperature of water in Kelvin (373.15 K), and ΔHvap is the latent heat of vaporization of water (504 cal/g).

Plugging in the values, we get:

K = (1.987 cal/deg/mol × 373.15 K^2) / 504 cal/g

K = 0.116 deg/mol

The boiling point constant (K) is a proportionality constant that relates the elevation in boiling point of a solvent to the molal concentration of the solute. Specifically, K is defined as the change in boiling point per unit molality of solute. It is a measure of the colligative properties of a solution, which depend only on the number of solute particles present in the solution, not on their identity or chemical properties.