How many moles of #CO_2# gas are contained in a flask holding 55.0 g of gas?

1 Answer
Jan 5, 2017

Answer:

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

Explanation:

#"Number of moles"# #=# #(55.0*cancelg)/(44.01*cancelg*mol^-1)=1.25*mol#

Note that our mathematical expression was consistent dimensionally, the #g# cancelled out, and #1/(mol^-1)=1/(1/(mol))=mol# as required.