Question

How many moles of sodium chloride (NaCl) solute are in 205 grams of a 92.5 percent by mass solution?

1.92 mol NaCl

2.63 mol NaCl

3.24 mol NaCl

7.71 mol NaCl

Answer 1

Find the mass of NaCl in 92.5% mass solution as:

205*0.925 = ___g

then divide the above mass you found with the molar mass of NaCl which is (22.99g/mol + 35.45g/mol)

The answer is: 3.24 mol NaCl