A 50.0-g sample of ethyl alcohol (C₂H₅OH) is dissolved in 75.0 g of water. What is the mole fraction of ethyl alcohol? A) 0.342 B) 0.667 C) 0.414 D) 0.207 E) none of these

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Quizplus · Accepted Answer

To find the mole fraction of ethyl alcohol, first calculate the moles of ethyl alcohol and water. The molar mass of C2H5OH is approximately 46.07 g/mol, so moles of ethyl alcohol = 50.0 g / 46.07 g/mol ≈ 1.085 moles. The molar mass of water is approximately 18.02 g/mol, so moles of water = 75.0 g / 18.02 g/mol ≈ 4.162 moles. The mole fraction of ethyl alcohol = moles of ethyl alcohol / (moles of ethyl alcohol + moles of water) = 1.085 / (1.085 + 4.162) ≈ 0.207.

A 500-G Sample of Ethyl Alcohol (C2H5OH) Is Dissolved in 75

A 500-G Sample of Ethyl Alcohol (C₂H₅OH) Is Dissolved in 75