A solution was made from 4.77g NaCl and 27.90g H2O. Calculate the mole fraction of NaCl in the solution.
0.0551
0.0451
0.0501
0.146
0.131
0.161
2007-05-15 00:43:13 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
A mole of NaCl is 23 + 35.5 = 58.5 g/mol
A mole of H2O is 2 + 16 = 18 g/mol
There are 4.77/35.5 = 0.081 moles NaCl
There are 27.9/18 = 1.55 moles NaCl
The mole fraction of NaCl is 0.081/(1.55 + 0.081) = 0.0501
2007-05-15 00:55:54 · answer #1 · answered by gebobs 6 · 0⤊ 0⤋
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2016-05-17 12:48:28 · answer #2 · answered by Anonymous · 0⤊ 0⤋
moles of NaCl = 4.77/58.5 = 0.08154
moles of H2O = 27.9/18 = 1.55
Mole fraction of NaCl= moles of NaCl/Total no of moles
=0.08154/(1.55+0.08154)
=0.049977
So you may use the third value 0.0501.
2007-05-15 00:53:07 · answer #3 · answered by alien 4 · 0⤊ 0⤋