Q. 34.0( 5 Votes )

Calculate the molar mass of the following compounds:

(i) MgO (ii) Na2CO3

(iii) H3PO4 (iv) Ca(OH)2

(v) Al2(SO4)3

Answer :

i. MgO:


Molar mass of Mg + 2 × Molar mass of oxygen


24u + 2×16


24 + 32


56g/mol
Thus, the molar mass of MgO is 56g/mol.


ii. Na2CO3:


2 × Molar mass of Na + Molar mass of carbon + 3×molar mass of oxygen


2 × 23 + 12 + 3 × 16


46 + 12 + 48


106g/mol


Thus, the molar mass of Na2CO3 is 106g/mol.


iii. H3PO4:


3 × Molar mass of hydrogen + Molar mass of phosphorus + 4×molar mass of oxygen


3 × 1 + 31 + 4 × 16


3 + 31 + 64


98g/mol


Thus, the molar mass of H3PO4 is 98g/mol.


iv. Ca(OH)2


Molar mass of calcium + 2 × Molar mass of oxygen + 2×molar mass of hydrogen


40 + 2 × 16 + 2 × 1


40 + 32 + 2


74g/mol


Thus, the molar mass of Ca(OH)2 is 74g/mol.


v. Al2(SO4)3


2 × Molar mass of aluminium + 3 × Molar mass of sulphur + 12×molar mass of oxygen


2 × 27 + 3 × 32 + 12 × 16


54 + 96 + 192


342g/mol


Thus, the molar mass of Al2(SO4)is 342g/mol.


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