Calculate the molarity of the two solutions

Question

Calculate the molarity of the two solutions

The first solution contains 0.250 mol of NaOH in 2.05 L of solution. molarity:

The second solution contains 21.1g of NaCl in 885 mL of solution. molarity:

Answer 1

1.

Molarity=moles solute/Liter of solution

M=.250mol NaOH/2.05L=.122M NaOH

2.

Calculate molar mass of NaCl

Na=23.00amu

Cl=35.45amu

Molar Mass=58.45amu

Calculate moles of NaCl

21.1g NaCl x mol NaCl/58.45g NaCl = .361 mol NaCl

Calculate molarity

M=.361 mol NaCl/.885L = .408M NaCl