How many moles are there in 1.5 g of ethanol, #CH_3CH_2OH#?

1 Answer
Nov 10, 2015

Answer:

#3.242459724759267mol #

Explanation:

Use the formula
#n = m/M#
where #n# is the amount in moles (#mol#), #m# is the mass in grams (#g#), and #M# is the molar mass in grams per mole (#gmol^-1#).


To find the molar mass of ethanol:
There are 2 #C# atoms (molar mass #12.011gmol^-1#),
6 #H# atoms (molar mass #1.008gmol^-1#),
and 1 #O# atom (molar mass #15.999gmol^-1#)

#(2 xx 12.011) + (6 xx 1.008) + (1 xx 15.999) = 46.261176gmol^-1#


To find the amount of ethanol:

#n(CH_3CH_2OH) = (1.5g)/(46.261176gmol^-1) #

#= 3.242459724759267mol #