The number of moles of the solute present in 600 mL of 0.05 M solution is                   

Molarity formula is given below.

        $\text{Molarity , M}=\frac{\text{number}\text{of}\text{moles}\left(n\right)}{\text{Volume}\text{in}\text{liters}}$

Volume of solution ,V = 600 mL

 $1000\text{mL =1}\text{L}$

Then, convert 600 mL into liters as shown below.

  $\frac{1\text{L}}{1000\text{mL}}\times 600\text{mL}=0.60\text{L}$

$\text{Molarity of solution}=0.05\text{ M}$

  $\text{Number of moles, n}=\text{M}\times \text{V}$

 $\therefore n=0.05\text{mol}/\text{L}\times 0.6\text{L}=0.03\text{ mol}$