Question

In cars, ethylene glycol, C2H6O2, is used as a coolant and antifreeze. A mechanic fills a radiator with 12.5 kg

of ethylene glycol and 1500 g of water. What is the molality of water in the solution? (need to convert grams to
moles)​

Answer 1

The molality of water in the solution is 6.66 molal

Step-by-step explanation:

Step 1: Data given

mass of ethylene glycol = 12.5 kg

Mass of water = 1500 grams

Molar mass of H2O = 18.02 g/mol

Step 2: Calculate moles H2O

Moles H2O = mass H2O / molar mass H2O

Moles H2O = 1500 grams / 18.02 g/mol

Moles H2O = 83.24 moles

Step 3: Calculate molality

molality = moles H2O / mass solvent

Molality = 83.24 moles / 12.5 kg

Molality = 6.66 mol/kg = 6.66 molal

The molality of water in the solution is 6.66 molal