What is the total mass of oxygen in 1.00 mole of #Al_2(CrO_4)_3#?

1 Answer
anor277
Feb 29, 2016

In #1# #mol# #Al_2(CrO_4)_3# there are #12# #"mol oxygen atoms"#, or #192# #g#.

Explanation:

Here, I speak of oxygen ATOMS (and not oxygen molecules). Clearly, there are 4 moles of oxygen atoms in one mole of chromate ion. We have a molar quantity of aluminum chromate, and thus there is 12-fold molar quantity of oxygen ATOMS: i.e. a mass of #12# #mol# #xx# #16.00*g*mol^-1# #=# #192.0# #g#.

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