Hi,
Finding this difficult for some reason...
"You measure vitamin C in oranges by grinding up 10 grams of oranges and then extracting all the vitamin C into 100 mL of methanol (density = 0.79 g/mL). If the concentration of vitamin C in the methanol is 100 ppm, what was the mass of vitamin C in the 10 grams of oranges?"
I tried two ways:
100 ppm = ug/10 grams = 1000 ug vitamin C
Or 100 ppm= mg/.1 L = 10 mg.
The answers are different even with inter converting the masses so I'm obviously missing something. Any insight is appreciated.