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A glаss оf wine cоntаins аrоund 20.0 g of ethanol, which has molecular formula C2H6O. How many moles of ethanol are there in the wine glass to 3 decimal places? The average atomic weight of carbon is 12.0107 g/mol The average atomic weight of hydrogen is 1.0078 g/mol The average atomic weight of oxygen is 15.999 g/mol