Question

A sample of 76 g of NaCl is dissolved to make 1 L of solution. What is the molarity of the solution? Show your work.

Answer 1

Answer:

1.3005 M

Explanation:

Given that,

Mass of NaCl = $76 \ g$

Molar mass of NaCl= $22.99+35.45=58.44\ g/mol$

The formula for calculation of moles,

Moles,

$n=\frac{given \ mass}{molar\ mass}\\n=\frac{76}{58.44} \ g/mol\\n=1.3005\ g/mol$

Given that volume $=1\ ltr$

Molarity,

$=\frac{moles\ of\ solute}{litre\ of\ solution} \\=\frac{1.3005}{1}\\ =1.3005\ M$

Therefore the molarity is 1.3005 M.