Answer
The molar mass for $Au(OH)_3$ is equal to 247.99 g/mole
Work Step by Step
Molar Mass ($Au(OH)_3$):
$Au: 196.97g $
$O: 16.00g * 3= 48.00g $
$H: 1.008g * 3= 3.024g $
196.97g + 48.00g + 3.024g = 247.99 g
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