500 mL of a 1M solution of common salt is taken.

How many grams of common salt are dissolved in this?

Given: Volume of solution of NaCl (common salt) = 500mL

= 0.5L

Molarity of solution = 1M

We can write,

Number of moles = Molarity × volume in litres

Number of moles = 1M × 0.5L

Number of moles = 0.5

Now, to find the mass in grams, apply the formula given:

Gram molecular mass of NaCl = GMM of Na + GMM of Cl

= 23g + 35.5g

= 58.5g

Therefore,

Mass of NaCl in grams = 0.5 × 58.5g

Mass of NaCl in grams = 29.25g

Thus, 29.25 grams of common salt are dissolved.

Note: If one litre of the solution contains 1mol of solute, it is called 1M (molar) solution.