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24 November, 19:53

A solution is made by mixing 36. g of heptane (C_7H_16) and 16. g of chloroform (CHCl_3). Calculate the mole fraction of heptane in this sol'. Be sure your answer has the correct number of significant digits.

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  1. 24 November, 22:16
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    Mole fraction of solute (heptane) → 0.73

    Explanation:

    Mole fraction = Moles of solute or solvent / Total moles

    Let's calculate the moles of everything:

    Moles of solute → Mass of solute / Molar mass

    36 g / 100 g/mol = 0.36 moles

    Moles of solvent → Mass of solvent / Molar mass

    16 g / 119.35 g/mol = 0.134 moles

    Total moles = 0.36 + 0.134 = 0.494 moles

    Mole fraction of solute = 0.36 / 0.494 → 0.73
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