it is desired to make a solution that is 3.0% by mass NaCl. if 160 g NaCl are available, what mass of solution can be prepared?

Question

answer must be in grams

Answer 1

3.0% by mass NaCl means 3 g NaCl in a total of 100 g solution. (note it is g of total solution)

So, if 3 grams will make 100 g of solution, how many g of solution can be made from 160 g?

Use proportions or use dimensional analysis:

• proportions:  3 g NaCl/160 g NaCl = 100 g solution/x g solution;  x = 5333 g solution
• dimensional analysis:  160 g NaCl x 100 g solution/3 g NaCl = 5333 g solution