I was wading in the creek and discovered what I thought to be a small meteorite. I took a small sample of it home, and determined it was 18.0% chromium by mass. How many grams of this meteorite would I need to be able to have 15.0g of chromium.
15.0 g x (100%/18%) = ? OR
0.18 x #g = 15.0 g
Solve for #g = ?