Answer
The molar mass for $Ca(IO_3)_2$ is equal to 389.9 g/mole
Work Step by Step
Molar Mass ($Ca(IO_3)_2$):
$Ca: 40.08g $
$I: 126.9g * 2 = 253.8$
$O: 16.00g * 3 * 2= 96.00g $
40.08g + 253.8g + 96.00g = 389.9g
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