posted by Jake .
I have no idea what I'm doing wrong here...
Question: A solution is 0.3% by mass calcium chloride. Therefore, 145 g of the solution contains how many grams of calcium chloride?
145g x (0.3g / 100g) = 0.435g
or 0.44g CaCl2
What am I doing wrong? Thank you!
0.435 g CaCl2 looks ok to me. Are you keying the answer into an on-line data base? If so, I notice you have only 1 place in the 0.3% (unless you just omitted the 0 as in 0.300%) and that may be too many significant figures. I would go with 0.4 g CaCl2 as the answer. Let me know how this turns out.
You are absolutely right. It totally slipped my mind that 0.3 has ONE sigfig. Thank you.. your help is much appreciated!