How many moles of methane #CH_4# are there in 80 grams of methane?

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Answer 1 · 2016-12-29T08:48:06

#5*mol# of methane are present in this mass..........

To find the number of moles, all we have to do is use the following relationship:

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

And the molar mass of methane may be read straight off your Periodic Table:

#"Molar mass of methane, "CH_4=(12.011+4xx1.00794)*g*mol^-1#

#"Mass"/"Molar mass"# #=# #(80*cancelg)/(16.0*cancelg*mol^-1)=??mol#.

Note that this calculation is consistent dimensionally:

#1/(mol^-1)=1/(1/(mol))=mol#