calculate mole fraction of CH3OH in a solution containing 18g of H20
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Add up the atomic weights of all the atoms in each molecule to get the molecular weight.
Take the given weights of methanol and water and convert them into moles. (think of moles as measuring by number of pieces).
Methanol (MW = 32) = 14.8 g x 1mole/32grams = 0.46 moles
Water (MW = 18) = 186 g x 1 mole/18grams = 10.33 moles
The molar fraction of methanol is the moles of methanol/all the moles in the solution.
0.46 moles methanol/(0.46 moles methanol + 10.33 moles water) = 0.042
Take the given weights of methanol and water and convert them into moles. (think of moles as measuring by number of pieces).
Methanol (MW = 32) = 14.8 g x 1mole/32grams = 0.46 moles
Water (MW = 18) = 186 g x 1 mole/18grams = 10.33 moles
The molar fraction of methanol is the moles of methanol/all the moles in the solution.
0.46 moles methanol/(0.46 moles methanol + 10.33 moles water) = 0.042
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