Ethylene glycol (C2H6O2), a nonelectrolyte, is used as antifreeze in car radiato

Question

Ethylene glycol (C2H6O2), a nonelectrolyte, is used as antifreeze in car radiators. A solution containing 86.0 g of ethylene glycol dissolved in 465 g of water has a density of 1.35 g/mL at 25 degrees Celsius. What is the %m/m of ethylene glycol in this solution and what is the molarity of it? Ethylene glycol (C2H6O2), a nonelectrolyte, is used as antifreeze in car radiators. A solution containing 86.0 g of ethylene glycol dissolved in 465 g of water has a density of 1.35 g/mL at 25 degrees Celsius. What is the %m/m of ethylene glycol in this solution and what is the molarity of it?

Explanation / Answer

first find volume of water V = mass / density

V = (465 g / 1.35 g/ml) = 344.44 ml water

%m/m = (86.0 g / 465 g) x 100 = 18.49 %

then find molarity of  A solution containing 86.0 g of ethylene glycol dissolved in 344.44 ml of water

molar mass of ethylene glycol = 62.0 g/mol

number of moles of ethylene glycol = (86.0 g / 62.0 g/mol ) = 1.387 moles

molarity of solution = ( 1.387 moles/ 0.34444 L) = 4.027 M ~ 4 M

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