Answer:
I am going to solve the question you have given without the use of the chemical equation.
The chemical formula of sodium chloride is NaOH
Molar mass: 40.0 g/mol
Molar mass of sodium: 23 g/mol
The mass of NaOH we have is 400kg which would be 400000g
Recall n = m/M (where n is the number of moles, m is the given mass, M is the molar mass):
Explanation: