What is an Independent Variable (IV)? *

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What is the mole fraction of a solution that contains 200 g of magnesium hydroxide in 225 g of water

0.215

Explanation:

Given parameters:

Mass of magnesium hydroxide = 200g

Mass of water = 225g

Unknown:

Mole fraction of solution = ?

Solution:

The mole fraction is a measurement of concentration that expresses the number of moles of solute to that of solution.

  Mole fraction =

A solution is made up of solute and solvent

Number of moles  =

Molar mass of Mg(OH)₂ = 24.3 + 2(16 + 1) = 58.3g/mol

Molar mass of H₂O = 2(1) + 16 = 18g/mol

Number of moles of Mg(OH)₂  =  = 3.43moles      solute

Number of moles of  H₂O  =   = 12.5moles              solvent

Mole fraction  =  = 0.215