Question

Q.22) Calculate the molar mass of the following substance and identify the polyatomic ions present in
each of them:
a)Al2(SO4)3
b) CaCO3
c) Na3PO4
(Atomic masses -- Al=27u, S=32u, O=16u, Ca=40u, C=12u, Na=23u, P=31u)​

Answer 1

Answer:

Molar mass is the mass of 1 mole of a substance

a)MgSO₄

Molar mass = 1 ×24 + 1 × 32 + 4 × 16

= 120 g

Groups of atoms carrying charges are called polyatomic ions.

SO₄ is the Poly atomic ion.

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b)Na₂CO₃

Molar mass = 2 × 23 + 1 × 12 + 3 × 16

= 106 g

Here , CO₃ is the polyatomic ion.

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This is your answer

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Explanation: