What is the molarity of this solution ?

Question

11.00 g of solid NaOH are dissolved in water to give a final solution of 29.8 mL .
What is the molarity of this solution ?

Answer 1

molarity is mole per dm^3
so the no. of moles is:
11/(23+16+1)=0.275 moles
next we need to convert 29.8 mL into dm^3
29.8mL=29.8cm^3
29.8cm^3=0.0298dm^3

so the molarity is 0.275/0.0298
=9.23M