Verified Answer :

moles =CaCo3=20g/100 gm/mol=0.2

The total number of moles in 20 grams of Calcium carbonate compound is 0.2 mole.

The number of moles can be calculated by the formula ,

\(\bold {n = \dfrac wm}\)

Where,

n- number of moles

w- given mass of the compound = 20 g

m - molar mass of compound = 100 g/mol

put the values in the formula

\(\bold {n = \dfrac {20\ g}{100\ gm/mol} }\\\\\bold {n =0.2}\)

Therefore, the total number of moles in 20 grams of Calcium carbonate compound is 0.2 mole.

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