posted by Kristi .
What is the mass percent of NaCl in a solution obtained by mixing 50g of this solution with 215g of H20?
What's the concn to begin with?
current% x (50/265) = ??
do you then multiply that answer by 100?
If you start with percent x (50/265) the answer is already in percent.
If you converted to a fraction first so the solution is
(%/100) x (50/265), yes, multiply that by 100.