What is molarity?

  • A
    Number of moles of solute dissolved in $1 \ L$ of solution.
  • B
    Number of moles of solute dissolved in $1 \ kg$ of solvent.
  • C
    Number of gram equivalents of solute dissolved in $1 \ L$ of solution.
  • D
    Number of moles of solute dissolved in $1 \ kg$ of solution.

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The hardness of a water sample is due to $50 \, ppm$ of $MgSO_4$. Calculate the amount of $MgSO_4$ in $mg$ present per $kg$ of water.

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The molarity of $20\% \,(W/W)$ solution of sulphuric acid is $2.55 \, M$. The density of the solution is $........... \, g \, cm^{-3}$.

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Two solutions of a substance are mixed as follows: $480 \ mL$ of $1.5 \ M$ first solution + $520 \ mL$ of $1.2 \ M$ second solution. The molarity of the final solution will be ............. $M$.

$50 \ g$ of a substance is dissolved in $1 \ kg$ of water at $90^{\circ} C$. The temperature is reduced to $10^{\circ} C$. The density is increased from $1.1 \ g \ cm^{-3}$ to $1.15 \ g \ cm^{-3}$. What is the $\%$ change of molarity of the solution?

If $2.0 \ g$ of $NaOH$ is dissolved in $500 \ cm^{3}$ of water, what is the molarity of the solution?

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