Question

4.0 grams of NaOH ( Molar mass = 40.0 g mol^-1 ) is dissolved in 500 cm³ of water. What is the molarity of NaOH solution? 

Options

• 1 M

• 0.8 M

• 0.5 M

• 0.2 M

Answer 1

0.2 M
Molarity = `4/(40 xx 0.5 ) = 1/5 = 0.2 "M"`