1. Calculate the mass of sodium chloride (NaCl):

* Since the solution is 85.5% NaCl by mass, this means that 85.5 grams of NaCl are present in every 100 grams of solution.

* We can set up a proportion:

(85.5 g NaCl / 100 g solution) = (x g NaCl / 155 g solution)

* Solving for x:

x = (85.5 g NaCl * 155 g solution) / 100 g solution = 132.43 g NaCl

2. Calculate the moles of NaCl:

* The molar mass of NaCl is approximately 58.44 g/mol.

* Moles = mass / molar mass

* Moles of NaCl = 132.43 g / 58.44 g/mol = 2.27 moles

Therefore, there are approximately 2.27 moles of sodium chloride solute in the solution.