Question

An undergraduate weighed out 20grams of sodium hydroxide pellets. If Na =23, O = 16 andH = 1, What is the mole of this sodium hydroxide.

Answer 1

m(NaOH)=20 g

M(NaOH) = 23+16+1=40 g/mol

20 g*1 mol/40 g= 0.50 mol

0.05 mol NaOH