1. wine is approximately 12% ethanol c2h5oh by volume . ethanol has a molar mass of 46.06g/mol and a density 0.789g/ml. how many moles of ethanol are present in a 750ml bottle of wine ?

Hey there!:

Total volume of wine = 750ml

volume ℅ of ethanol = 12 %

volume of ethanol = (12ml/100ml)*750ml = 90ml

Density of Ethanol = 0.789 g/ml

Mass of Ethanol = 0.789 g/ml × 90ml = 71.01 g

Molar mass of ethanol = 46 g/mol  Nº of mole of ethanol = Mass/molar mass

=>  71.01 g /46(g/mol)= 1.5437 moles

Hope this helps!