We want the mass of NaOH, Given:
V = 27.0 mL = 0.0270 L
C = 2 M
Given the concentration and volume we can find the number of moles of NaOH, and then convert it to mass.
C = n/V (or Molarity = moles of solute/litres of the solution) where C is the concentration or molarity, n is the number of moles of the solute and V is the volume of the solution
n = Cv
n = 2 x 0.0270 L
n = 0.054 mol
Now that we have the number of moles, we can get the mass of NaOH. Molar mass of NaOH = 39,997 g/mol
n = m/M where m is the mass and M is the molar mass
m = nM
m = 0.054 mol x 39,997 g/mol
m = 2.16 g