Question 11.5: USING DENSITY TO CONVERT FROM MOLALITY TO MOLARITY Ethylene ...

USING DENSITY TO CONVERT FROM MOLALITY TO MOLARITY

Ethylene glycol, $C_{2}H_{4}(OH)_{2}$ , is a colorless liquid used as automobile antifreeze. If the density at 20 °C of a 4.028 m solution of ethylene glycol in water is 1.0241 g/mL, what is the molarity of the solution? The molar mass of ethylene glycol is 62.07 g/mol.

STRATEGY
A 4.028 m solution of ethylene glycol in water contains 4.028 mol of ethylene glycol per kilogram of water. To find the solution’s molarity, we need to find the number of moles of solute per volume (liter) of solution. The volume, in turn, can be found from the mass of the solution by using density as a conversion factor.

ethylene

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