128.3 grams of methane is equal to how many moles of methane?

1 Answer
Feb 8, 2017

Answer:

About #8.0*mol#

Explanation:

#"Number of moles"# #=# #"Mass"/"Molar mass"#.

And thus we get the quotient:

#(128.3*cancelg)/(16.04*cancelg*mol^-1)=8.0*"moles of methane".#

Note that the expression is dimensionally consistent, we wanted an answer in moles, and the quotients gives, #1/(mol^-1)=1/(1/(mol))=mol# as required.

Under standard conditions of pressure and temperature, what volume would this molar quantity of methane occupy?