Hey there!
CaCOH
Ca: 1 x 40.078 = 40.078
C: 1 x 12.01 = 12.01
O: 1 x 16 = 16
H: 1 x 1.008 = 1.008
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69.096 g/mol
The molar mass of CaCOH is 69.096 g/mol.
Hope this helps!