Question

What is the molarity of a solution of 10 gram NaCl dissolved in water to make the volume of 500 ml

Answer 1

Answer:

0.34 M

Explanation:

The mass of NaCl is 10 grams. The molar mass of NaCl is 58.5 u. The moles are,

$= \frac{10}{58.5} = 0.17 \ mol$

The volume is 500 ml or 0.5 litres.

The molarity is,

$= \frac{0.17}{0.5} = 0.34 \ M$

Answer 2

Explanation:

since

$Molarity = no. of moles/volume of solution in (l)$

$number of moles = given mass/molar mass$

therefore number of moles in NaCl =$10g/23(molar mass of (NaCl)+35(molar mass of H_2O$

then,

$number of moles=10/58=0.17$

now, $Molarity = no. of moles/volume of solution in (l)$

       500ml=1/2(l)

        [tex]Molarity = 0.17/1/2=0.34mol