Question:
The unit of ebullioscopic constant is ______.
The unit of ebullioscopic constant is ______.
Updated On: Jun 7, 2022
- $K \,kg\, mol^{-1}\,$ or $\, K \,(\text{molality})^{-1}$
- $mol\, kg\, K^{-1}\, $ or $\, K^{-1}\, (\text{molality})$
- $ kg \,mol^{-1} \, K^{-1} \,$ or $\, K^{-1}\, (\text{molality})^{-1}$
- $K \, mol\, kg^{-1} \,$ or $\, K\, \text{(molality)}$
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The Correct Option is A
Solution and Explanation
As we know from elevation in boiling point that $U$
$\Delta T_b = K_b m$
Unit of $K_b = \frac{\text{Unit of } \Delta T_b}{\text{Unit of} \,m}$
$= \frac{K}{mol\,kg^{-1}} = K\,mol^{-1} kg$
$\Delta T_b = K_b m$
Unit of $K_b = \frac{\text{Unit of } \Delta T_b}{\text{Unit of} \,m}$
$= \frac{K}{mol\,kg^{-1}} = K\,mol^{-1} kg$
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Concepts Used:
Rate of a Chemical Reaction
The rate of a chemical reaction is defined as the change in concentration of any one of the reactants or products per unit time.
Consider the reaction A → B,
Rate of the reaction is given by,
Rate = −d[A]/ dt=+d[B]/ dt
Where, [A] → concentration of reactant A
[B] → concentration of product B
(-) A negative sign indicates a decrease in the concentration of A with time.
(+) A positive sign indicates an increase in the concentration of B with time.
Factors Determining the Rate of a Reaction:
There are certain factors that determine the rate of a reaction:
- Temperature
- Catalyst
- Reactant Concentration
- Chemical nature of Reactant
- Reactant Subdivision rate