How do we find the formula mass of #"chromic sulfite"#, #Cr_2(SO_3)_3#?

1 Answer
anor277
Feb 17, 2017

#"Of chromic sulfite................?"#

Explanation:

We add the atomic masses of the the given constituents......of #Cr_2(SO_3)_3#:

#=[2xx52.00(Cr)+3xx32.06(S)+9xx16.00(O)]*g*mol^-1#

#=344.18*g*mol^-1#.

All I have done is to take the atomic masses from the Periodic Table, and added them together appropriately. You are not expected to remember any of the atomic masses (tho' a few will stick).

What is the molar mass of #Cr_2(SO_4)_3*18H_2O#?

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