I have the compound C20H24O2N2, A quinine molecule
The Question:
Calculate the molarity of 100.7g of quinine in 275 mL of water.
http://www.chemspider.com/Chemical-Structure.84989.html
324.4 grams/mol
so
100.7/275 = x/1000
x is grams in a liter
divide x by 324.4 to get mols in a liter