how would you make a 200mL solution of 25 mM dihydroxyphenyl

how would you make a 200mL solution of 25 mM dihydroxyphenylalaine (DOPA)?

Please show your work!

Answer:

Molar mass of DOPA=: 197.1879 g/mol

Volume required = 200 mL = 0.2 L

desired molarity =25 mM = 0.025 M

Grams to weigh = desired volume x desired molarity x Molar mass

Grams to weigh = 0.2 L x 0.025 M x 197.18

Grams to weigh =0.98 g

Weight 0.98 g of DOPA and dissolved in 200 mL of solvent