The molar mass of sulphate ion is 96 g mol ^-1. What is the meaning of this statement?

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Solution

Molar Mass - The molar mass of the compound is the mass of 1 mole of that substance. The unit of molar mass is grams/mole.
1 mole of compound = 6.022 x 10 ²³is called Avogadro's number.
The molar mass of sulphate ion (SO₄ )^-2is 96 g mol ^-1.
The number of Sulphur atoms in sulphate ion (SO₄ )^-2 = 1 and mass number = 32.
Number of Oxygen atoms in sulphate ion (SO₄ )^-2 = 4 and mass number of 4 oxygen atoms = 4 x 16 = 64.
Hence molar mass = 32 + 64 = 96 g / mole ^-1.
Therefore Molar mass of sulphate ion is 96 g mol ^-1.

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