Question:

If active mass of a $6\%$ solution of a compound is $2$, its molecular weight will be

Updated On: Jul 28, 2022
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The Correct Option is A

Solution and Explanation

Given: Percentage of solution $= 6$ and active mass of the compound $=2=2 \,M$ solution or $2\, moles /$ litre. Since $100 \,ml$ solution contains $6 \,g$, therefore $1000\, ml$ solution contains $=\frac{6 \times 1000}{100}=60 \,g$, therefore molecular weight of the compound $=\frac{60}{2}=30$
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Concepts Used:

Concentration of Solutions

It is the amount of solute present in one liter of solution.

Concentration in Parts Per Million - The parts of a component per million parts (106) of the solution.

Mass Percentage - When the concentration is expressed as the percent of one component in the solution by mass it is called mass percentage (w/w).

Volume Percentage - Sometimes we express the concentration as a percent of one component in the solution by volume, it is then called as volume percentage

Mass by Volume Percentage - It is defined as the mass of a solute dissolved per 100mL of the solution.

Molarity - One of the most commonly used methods for expressing the concentrations is molarity. It is the number of moles of solute dissolved in one litre of a solution.

Molality - Molality represents the concentration regarding moles of solute and the mass of solvent.

Normality - It is the number of gram equivalents of solute present in one liter of the solution and it is denoted by N.

Formality - It is the number of gram formula present in one litre of solution.