Calculate the mass of sodium hydroxide in 450 ml soluton whose molarity 0.2 M.

Answer 1

0.2 M so 0.2 moles per liter

450 ml = 450 / 1000 l = 0.45 l

So total 0.2 x 0.45 moles of sodium hydroxide

Find the molar mass of Na O H (add up the molar masses of Na, O, H)

Multiply by 0.2 x 0.45

This gives the required mass in g

Mike