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23-10-2020
Chemistry

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How many moles of ethanol (C2H5OH) are present in 145 mL of ethanol, if the density of ethanol is 0.789 g/mL

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23-10-2020

Answer:

2.5 moles of ethanol

Explanation:

Density of ethanol= 0.789 g/mL

Volume of ethanol = 145 ml

Mass of ethanol = ?

Mass of ethanol = density × volume

= 114.41 g of ethanol

But number of moles = mass/ molar mass

Molar mass of ethanol = 46 g/ moles

Number of moles = 114.41g/46g/moles = 2.5 moles of ethanol

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