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Which expression correctly gives the molarity of a solution?
A$\text{Molarity} = \dfrac{\text{mass of solute}}{\text{molecular weight} \times \text{volume in litre}}$ interpreted as moles per litre
B$\text{Molarity} = \dfrac{\text{equivalents of solute}}{\text{volume in litre}}$
C$\text{Molarity} = \text{Normality} \times \text{Eq. wt.}$
D$\text{Molarity} = \dfrac{\text{volume in litre}}{\text{moles of solute}}$
Answer & Solution
Correct answer: A. $\text{Molarity} = \dfrac{\text{mass of solute}}{\text{molecular weight} \times \text{volume in litre}}$ interpreted as moles per litre
Molarity is defined as moles of solute per litre of solution. Option A expresses that idea correctly. Option B is normality, C gives strength, and D is the inverse of molarity.
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