What is the mole fraction of NaCl if 5 moles of NaCl is dissolved in 1 L of water?
Volume of water is 1 L = 1000 mL
Since density of water is 1 g/mL,
Mass of water = 1000 g
Molar mass of H2O,
MM = 2*MM(H) + 1*MM(O)
= 2*1.008 + 1*16.0
= 18.016 g/mol
mass(H2O)= 1000 g
use:
number of mol of H2O,
n = mass of H2O/molar mass of H2O
=(1*10^3 g)/(18.02 g/mol)
= 55.51 mol
Now use:
Mole fraction of NaCl = mol of NaCl / Total number of mol
= 5 / (55.51 + 5)
= 0.0826
Answer: 0.0826
What is the mole fraction of NaCl if 5 moles of NaCl is dissolved in 1...
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