Calculate the formula mass of ethanol, c2h5oh. express your answer to three significant figures and include the appropriate units.

To answer this question, you need to understand how to calculate a compound molecular mass. In ethanol, there are 2 carbon, 6 hydrogen, and 1 oxygen atoms. The molecular weight of carbon is 12, hydrogen is 1, and oxygen is 16. Then, the calculation would be:

ethanol mass = 2*12 + 6*1 + 1*16 = 46g/moles