Calculate the mass of sodium hydroxide in 5.00 dm³ of a 0.125 mol dm‾³ solution [NaOH = 40 g mol]

A. 0.0156 g
B. 0.625 g
C. 1.00 g
D. 25. 0 g

Correct Answer: Option D

D. 25. 0 g

Explanation

1 mole of NaOH per dm³ has a mass of 40g mass of NaOH in 0.125 mole = 0.125 x 40 = 5g mass in 5.00 dm³ of the solution = 5 x 5 = 25.0g