Answer
The molar mass for $MgCO_3$ is equal to 84.32 g/mole
Work Step by Step
Molar Mass ($MgCO_3$):
Molar mass :
$Mg: 24.31g $
$C: 12.01g $
$O: 16.00g * 3= 48.00g $
24.31g + 12.01g + 48.00g = 84.32g
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