Answer:
0.075 is the mole fraction for HCl
Explanation:
Mole fraction = Moles of solute or solvent / Total moles
Total moles = moles of solute + moles of solvent
In this solution:
HCl is the solute
H₂O is the solvent
4.50 m means molal, 4.50 moles of HCl in 1kg of water.
Let's determine the moles of water
1000 g . 1mol/18 g = 55.5 moles
Total moles = 4.50 + 55.5 = 60.05 moles
Mole fraction of HCl = 4.50 / 60.05 → 0.075
The mole fraction for HCl is 0.075
We know that
Mole fraction = Moles of solute or solvent / Total moles
Also,
Total moles = moles of solute + moles of solvent
Now the mole of water should be
1000 g . 1mol/18 g = 55.5 moles
Now
Total moles = 4.50 + 55.5 = 60.05 moles
So,
Mole fraction of HCl = 4.50 / 60.05 = 0.075
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