Mixing and volume additivity a mixture of methanol (methyl alcohol) and water contains 60.00 % water by mass ideal specific gravity correct. the specific gravity of water at 20°c is about 0.9982; the specific gravity of methanol at 20°c is about 0.7917. 0.826 assuming volume additivity of the components, estimate the specific gravity of the mixture at 20°c. sg what volume of this mixture is required to provide 350.0 mol of methanol? 28.27liters