What mass of iron is present in a #100*g# mass of #"ferric oxide"#?

1 Answer
anor277
Sep 26, 2016

Approx. #70*g#.

Explanation:

The molecular mass of #"ferric oxide, "Fe_2O_3# is #159.69*g*mol^-1#.

#"Moles of ferric oxide"# #=# #"Mass"/"Molar mass"# #=# #(100*g)/(159.69*g*mol^-1)# #=# #0.626*mol#

And thus in a #100*g# sample there are #2xx0.626*molxx55.85*g*mol^-1# of iron metal.

And thus iron content #=# #0.626*molxx2xx55.85*g*mol^-1#

#=# #??g#.

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