A solution was prepared by dissolving 150.0 g of kcl in 295 g of water. calculate the mole fraction of kcl. (the formula weight of kcl is 74.6 g/mol. the formula weight of water is 18.0 g/mol.) express the mole fraction of kcl to two decimal places.

Question

Lucia Valentine

Chemistry

25 July, 11:49

A solution was prepared by dissolving 150.0 g of kcl in 295 g of water. calculate the mole fraction of kcl. (the formula weight of kcl is 74.6 g/mol. the formula weight of water is 18.0 g/mol.) express the mole fraction of kcl to two decimal places.

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Bridger Lam · Answer 1

Calculate the mole of KCl and water

moles of KCl = 150g/74.6g/mol = 2.01 moles

moles of water = 295g/18g/mol=16.39 moles

calculate the total number of moles

2.01 + 16.39 = 18.4 moles

moles fraction of KCl is therefore=2.01/18.4 = 0.11mole