mole fraction of potassium bromide = 0.23
Explanation:
We define mole fraction of a specific compound in a mixture as:
mole fraction of a compound = number of moles of the compound / total number of moles
in our case we have:
number of moles of potassium bromide = 3 moles
total number of moles = number of moles of potassium bromide + number of moles of water
total number of moles = 3 + 10 = 13 moles
mole fraction of potassium bromide = 3 / 13 = 0.23
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