How many moles of sodium chloride (nacl) solute are in 155 grams of an 85.5 percent by mass solution?

85.5 percent by mass = 85.5 / 100 = 0.855

155 g x 0.855 => 132.525 g ( mass of solute )

Molar mass NaCl = 58.44 g/mol

number of moles:

n = mass of solute / molar mass

n = 132.525 / 58.44

n = 2.27 moles of NaCl

hope this helps!

Ithink the answer is 56.