Answer:
Mole fraction of hexane in your sample is 0,746
Explanation:
Based on the information you can write the following equations:
X + Y = 1 <em>(1)</em>
Where X is mole fraction of hecane and Y is mole fraction of toluene
Also, based on the assumption that the refractive index of the hexane + toluene mixture varies linearly with mole fraction you can write:
1,375X + 1497Y = 1406 <em>(2)</em>
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Replacing (1) in (2):
1,375X + 1,497(1-X) = 1,406
1,375X - 1,497X + 1,497 = 1,406
-0,122X = -0,091
X = -0,091/-0,122
X = 0,746
Thus, the <em>mole fraction of hexane in your sample is 0,746</em>
Also you can know the mole fraction of toluene replacing this value in (1):
0,746 - Y = 1
Y = 1-0,746
Y = 0,254
I hope it helps!
