4.2032355g are there in 21.3 moles of \(BaCO_3\).
What are moles?
A mole is defined as 6.02214076 × \(10^{23}\) of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
Mass of \(CaCO_3\) = mole x molar mass
= 21.3 mol x 197.335 g/mol
=4.2032355g
Hence, 4.2032355g are there in 21.3 moles of \(BaCO_3\).
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