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Molal Solution/Mass of Water and Mole Fraction

What mass of water must be used to dissolve 20.0 g of C2H5OH to prepare a 0.0500 molal solution of ethanol? 8.70Kg how?

Calculate the mole fraction of ethyl alcohol C2H5OH in a solution that contains 230 grams of C2H5OH and 312 grams of benzene C6H6? 0.56 How?

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Molecular weight of ethanol = 46
Moles of ethanol in 20 grams = 20/46 = 0.4348
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