How many moles are in a sample of #CO_2# that contains #8.12*10^22# of #O# atoms?

1 Answer
Feb 3, 2016

Answer:

0.067mols

Explanation:

#CO_2#

From the formula we can see that,

#2xx6.02xx10^(23)#atoms of #O# are in #6.02xx10^(23)# molecules of #CO_2#
#:. 1# atom of #O# is in #(6.02xx10^(23))/(2xx6.02xx10^(23))# molecules of #CO_2#
#:.8.12xx10^(22)# atoms of #O# are in #(6.02xx10^(23)xx8.12xx10^(22))/(2xx6.02xx10^(23))# molecules of #CO_2#

#=4.06xx10^(22)# molecules

we know,

#n=N/N_A#

#=(4.06xx10^(22))/(6.02xx10^(23))#

#=0.067mol s#