Answer
The molar mass for $Mn_2(SO_4)_3$ is equal to 398.09g/mol.
Work Step by Step
$Mn:$ 54.94* 2 +
$S{O_4}:$ 3 * ( 32.07($S$)* 1 + 16.00($O$)* 4 )
Adding these molar masses together gives:
398.09g/mol
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