A solution is made by mixing of heptane and of benzene . Calculate the mole fraction of heptane in this solution. Round your answer to significant digits.

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0.3

Explanation:

Molar mass of benzene = 78 g/mol

Molar mass of heptane = 100 g/mol

number of moles of heptane = 59 g/100 g/mol = 0.59 moles

number of moles of benzene = 103 g/78 g/mol = 1.32 moles

Total number of moles = 0.59 + 1.32 = 1.91 moles

Mole fraction of heptane = 0.59/1.91 = 0.31