What will be the molarity of a solution, which contains 5.85 g of nacl(s) per 500 ml?

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Solution

The correct option is D 0.2mol L−1
Calculating the number of moles of solute

Mass of solute (Nacl) = 5.85 g
Molar mass of solute (Nacl) = 58.5 g/mol

∴ Number of moles of solute (Nacl) =
Mass of soluteMolar mass of solute(Nacl)=5.8558.5=0.1 mol

Molarity

To find molarity, formula used is:
Volume of the solution = 500 mL = 0.5 L

Molarity = number of moles of soluteVolume of solution (in L)

=0.1 mol0.5L=0.2 molL−1

Thus, molarity of the given solution is 0.2mol L−1

Solution

Since, molarity (M) is calculated by following equation

Molarity=weight×1000molecular weight×volume(mL)

=5.85×100058.5×500=0.2mol L−1

Note Molarity of solution depends upon temperature because volume of a solution is temperature dependent.

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