In cars, ethylene glycol, C2H6O2, is used as a coolant and antifreeze. A mechanic fills a radiator with 7.1 kg of ethylene glycol and 1.2 kg of water.

What is the molar mass of ethylene glycol?

What is the molality of the water in the solution?

Based on the given molecular formula, the molar mass of ethylene glycol is 62 g/mol. We solve for the number of moles of the solute,

n = (7.1 kg) (1000 g / 1 kg) / 62g/mol = 114.52 mol

Then, we divide this value by the given mass of the water in kg

m = (114.52 mol) / 1.2 kg = 95.43 m

Thus, the molality of the substance is approximately equal to 95.43 m.