How many grams of ethylene glycol (C2H6O2) per kilogram of water are needed to give protection up to 120 °C in a car radiator?

Do you mean to keep the car radiator water from boiling?

delta T = 20 = Kb*molality
Solve for m.

m = mols/kg solvent
m = mols/kg water. You must know the volume of the radiator.

mol = grams/molar mass. You know mols an molar mass ethylene glycol; solve for grams ethylene glycol.

I feel I wasn't given enough information to answer the question originally, but I will try to do my best with what I was given.

Hi,

First, you need the boiling constant of water which is 0.512 oC/m.

molality= Delta T / Kb

molality= 120 oC / 0.512 oC/m = 234 m

To determine the amount of ethylene glycol (C2H6O2) needed per kilogram of water to provide freeze and boil protection in a car radiator up to 120 °C, we need to refer to the ethylene glycol-water mixture's freeze and boil protection chart.

The chart provides the required percentage of ethylene glycol by weight for different temperature ranges. Typically, for car radiators, a mixture that protects between -35 °C and 120 °C is recommended.

Here's how you can determine the amount of ethylene glycol per kilogram of water:

1. Look for a freeze and boil protection chart specific to the ethylene glycol concentration you are using. Different charts exist for various ethylene glycol concentrations, such as 50%, 60%, or 70% ethylene glycol by weight.

2. Identify the temperature range you desire protection for. In this case, from -35 °C to 120 °C.

3. According to the chart, determine the recommended ethylene glycol concentration for the given temperature range. The recommended concentration could vary depending on different manufacturers' suggestions or specific formulations.

4. Convert the recommended ethylene glycol concentration to grams per kilogram (g/kg) since ethylene glycol's weight is usually measured in grams.

For example, if the recommended concentration is 50% ethylene glycol, it means that you need 50 grams of ethylene glycol for every 100 grams of the mixture (ethylene glycol + water). Converting this to grams per kilogram, it becomes 500 grams of ethylene glycol per kilogram of water.

Remember to check the freeze and boil protection chart for the exact concentration recommended by the manufacturer to protect your car radiator up to the desired temperature.

It's crucial to note that the specific recommendations may vary based on your vehicle's make and model, regional climate conditions, and the ethylene glycol formulation you choose. Consulting the vehicle's manual or seeking professional advice from a mechanic may provide more accurate information for your particular situation.