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The ions which constitute more than one atom are referred to as polyatomic ions
2×39+12+48= 138u
100g of Na
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Polyatomic ion
A charged chemical species composed of two or more atoms covalently bonded or of a metal complex that can be considered to be acting as a single unit. The prefix poly- means "many," in Greek, but even ions of two atoms are commonly referred to as polyatomic
Molecular mass of K2CO3 is 138
Molecular mass of Na2o is 62
100 grams of sodium contain 4.34 moles of atom whereas 100 grams of iron contain 1.78 moles of atoms. Since 100 grams of sodium has more moles, it contains more atoms than 100 grams of iron. As we know , the one - mole atoms contains 6.022 multiply 10 ^23 atoms
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