Pleas help I’m stuck on this problem What is the mole fraction of KCI in a
mixture of 0.564 g NaCl, 1.52 g KCI,
and 0.857 g LICI?

0.4

Explanation:

Given parameters:

Mass of NaCl  = 0.564g

Mass of KCl  = 1.52g

Mass of LiCl = 0.857g

Unknown:

Mole fraction of KCl = ?

Solution:

First, find the number of moles of the given species;

     Number of moles  =

Molar mass of KCl  = 39 + 35.5 = 74.5g/mol

Molar mass of NaCl  = 23 + 35.5 = 58.5g/mol

Molar mass of LiCl  =  7 + 35.5  = 42.5g/mol

  Number of moles of KCl  =   = 0.02mol

  Number of moles of NaCl  =   = 0.0096mol

  Number of moles of LiCl  =   = 0.02mol

Sum of moles  = 0.02mol + 0.0096mol + 0.02mol  = 0.0496mol  

Mole fraction of KCl  =   = 0.4

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