Define the following modes of expressing the concentration of a solution: Mass percentage,Molarity,Molality,and Mole fraction. Which of these modes are independent of temperature and why?
(N/A) $1$. Mass percentage: The mass of the solute in grams present in $100 \ g$ of the solution.
$2$. Molarity $(M)$: The number of moles of solute dissolved in $1 \ L$ of solution.
$3$. Molality $(m)$: The number of moles of solute dissolved in $1 \ kg$ of solvent.
$4$. Mole fraction $(x)$: The ratio of the number of moles of one component to the total number of moles of all components in the solution.
Modes independent of temperature are Molality and Mole fraction.
Reason: These modes are defined in terms of mass (or moles),which do not change with temperature. In contrast,Molarity involves volume,which changes with temperature due to thermal expansion or contraction.
$2$. Molarity $(M)$: The number of moles of solute dissolved in $1 \ L$ of solution.
$3$. Molality $(m)$: The number of moles of solute dissolved in $1 \ kg$ of solvent.
$4$. Mole fraction $(x)$: The ratio of the number of moles of one component to the total number of moles of all components in the solution.
Modes independent of temperature are Molality and Mole fraction.
Reason: These modes are defined in terms of mass (or moles),which do not change with temperature. In contrast,Molarity involves volume,which changes with temperature due to thermal expansion or contraction.
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