Answer:
1.2 M.
Explanation:
Molarity is the no. of moles of solute in a 1.0 L of the solution.
M = n/V.
M = (mass/molar mass)solute x (1000/V of the solution).
mass of NaOH = 120.0 g.
molar mass of NaOH = 40.0 g/mol.
V of the solution = 2.5 L = 2500.0 mL.
∴ M = (mass/molar mass)solute x (1000/V of the solution) = (120.0 g / 40.0 g/mol) x (1000 / 2500.0 mL) = 1.2 M.
