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  • A solution is prepared by dissolving 5 g of  in 500 mL of water. The molarity of the solution is:<div clas

A solution is prepared by dissolving 5 g of NaOH in 500 mL of water. The molarity of the solution is:

Option: 1

0.1 M


Option: 2

0.5 M


Option: 3

1 M


Option: 4

2 M


Answers (1)

best_answer

\\\textrm{Molarity (M)= Number of moles of solute/Volume of solution in litres} \\ \\\mathrm{\textup{Molecular weight of NaOH} = 23+16+1=40 \mathrm{~g} / \mathrm{mol}}

\\\textup{Number of moles of NaOH}=\frac{5 \mathrm{~g}}{ 40 \mathrm{~g} / \mathrm{mol}}=0.125 \mathrm{~mol} \\\\ \textup{Volume of solution in litres} =\frac{500 \mathrm{~mL}}{1000}=0.5 \mathrm{~L} \\\\\mathrm{ Molarity =\frac{0.125 \mathrm{~mol} }{ 0.5 \mathrm{~L}}=0.5\ \mathrm{M}}

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