A mixture of methanol (methyl alcohol) and water contains 50.00% water by mass. The specific gravity of water at 20C is about 0.9982 ; the specific gravity of methanol at 20C is about 0.7917. Assuming volume additivity of the components, estimate the specific gravity of the mixture at 20C.SG= What volume of this mixture is required to provide 250.0 mol of methanol? liters Repeat part (a) with the additional information that the specific gravity of the mixture at 20C is 0.9156 (making it unnecessary to assume volume additivity). What is the real volume of the mixture required to provide 250.0 mol methanol? liters What percentage error results from the volume-additivity assumption? %