a solution made from ethanol, and water is 1.75 molality in ethanol. how many grams of ethanol are contained per 250 g of water? .
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1.75 molal means 1.75 mol ethanol dissolved in 1.0kg water
This is equal to 1.75*250/1000 = 0.4375 mol ethanol dissolved in 250g water
Molar mass ethanol = 46.07 g/mol
Mass of 0.4375 mol = 0.4375*46.07 = 20.156 g ethanol
Answer: (2 significant figures) 20g ethanol.
This is equal to 1.75*250/1000 = 0.4375 mol ethanol dissolved in 250g water
Molar mass ethanol = 46.07 g/mol
Mass of 0.4375 mol = 0.4375*46.07 = 20.156 g ethanol
Answer: (2 significant figures) 20g ethanol.