If 50.00mL of propylene glycol has a mass of 51.80g, what is its density. b) To obtain the same antifreeze protection requires 76 g of propylene glycol to replace 62 g of ethylene glycol. What is the mass of propylene glycol required to replace 1.00 gallon of ethylene glycol? c) What is the volume of propylene glycol, in gallons, needed to achieve the same antifreeze protection as 1.00 gallon of ethylene glycol.