What is the mass percent of a solution if 42.9 grams of aspirin is dissolved into 175 mL of ethanol? (Density of ethanol is 0.789 g/mL

Answer 1

You are calculating w/w%, which is

mass (A) x100%/(total mass A + M)

From the density we can find the mass of ethanol

M=0.789 g/ml x 175 ml

A=42.9 g