How many moles of O2 in 40.0 grams of oxygen gas?

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Answer 1 · 2018-01-19T04:39:09

#1.25# moles of #O_2#

First, we need to calculate the molar mass of oxygen gas.

Oxygen gas is #O_2#.

#O_2# has a molar mass of #32g"/"mol#.

#:."Moles"_(O_2)=(40g)/(32g"/"mol)#

#:."Moles"_(O_2)=(40cancelg)/(32cancelg"/"mol)#

#"Moles"_(O_2)=1.25mol#

#:.# There are #1.25# moles of #O_2# in #40g# of oxygen gas.

Answer 2 · 2018-01-19T04:40:58

1.25

Molar mass of oxygen gas (#O_2#) = 32gm

So,

no of moles #= 40/32#

no of moles #= 1.25#