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?

Molecular mass of ethylene glycol is 62 g/mol and molality of solution will be 9.39 mol/kg.

Explanation:

Mass of oxygen atom = 16 g/mol

Mass of hydrogen atom = 1 g/mol

Mass of carbon atom = 12 g/mol

Mass of ethylene glycol =

Mathematically,

Water is the solute and ethylene glycol is the solvent in this case.

We are given:

Mass of solute (water) = 1.2 kg = 1200 g      (Conversion factor: 1 kg = 1000 g)

Molar mass of solute (water) = 18 g/mol

Mass of solvent (ethylene glycol) = 7.1 kg

Putting values in above equation, we get:

Hence, molecular mass of ethylene glycol is 62 g/mol and molality of solution will be 9.39 mol/kg.

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !

b is the correct answer

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