1. The problem statement, all variables and given/known data What is the specific gravity of a mixture 40% ethyl alcohol and 60% water? The specific gravity of ethyl alcohol is 0.79. 2. Relevant equations 3. The attempt at a solution He showed us a way to do it for another type of problem but I approached it a bit differently and I wanted to make sure my answer was logical/correct before submitting it. So what I did was this: Assume 100 mL of mixture. Then you have 40 mL alcohol, 60 mL water. Density of water = 1 = mass/60 mL; mass of water therefore = 60 g 0.79 = density of alcohol/density of water (1), so density of alcohol = 0.79 I set up a cross multiplication: 0.79 g/1 mL = x g/40 mL I got 31.6 g of ethyl alcohol. So the total mass of the mixture is 91.6 g. Thus the density of the mixture is 91.6 g/100 mL = 0.916 Thus specific gravity of the mixture = 0.916/1 = 0.916. Does this seem accurate?