Question

Whereas molality is same at all temperature is not ? give reason?

Answer 1

Molarity is temperature dependent as it is defined as the number of the moles of the solute dissolved per liter of the solution. As volume is temperature dependent, its value changes with change in temperature. Accordingly molarity of the solution can also change.

Molality is not temperature dependent as it is defined as the number of the moles of the solute dissolved per kg of the solvent. As mass is not temperature dependent, its value does not change with change in temperature.