How many ml of 95% of ethyl alcohol should be added to sterile water for injection to make 1/2 liter of a 40% ethyl alcohol solution?

V = 210.5  mL

Explanation:

∴ C1 = 0.95

∴ C2 = 0.40

∴ V2 = 0.500 L

⇒ V1 = ((0.50)(0.40))/(0.95)

⇒ V1 = 0.2105 L

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.