calculate the molecular weight of
1. C2H2O
2.H2O2
3.Al2(So4)3
4.CO

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Solution

1) C₂H₂O
The atomic weight of carbon is 12 u, of hydrogen is 1 u and that of oxygen is 16u. So the molecular weight of the compound would be the sum atomic weight of all the elements. Thus
molecular weight of C₂H₂O = 2 X atomic weight of carbon + 2 X atomic weight of hydrogen + atomic weight of oxygen
= [2 X (12) + 2 X (1) + 16] u
= 42 u
2) H₂O₂
The atomic weight of hydrogen is 1 u and that of oxygen is 12 u. So
molecular weight of H₂O₂ = 2 X atomic weight of hydrogen + 2 X atomic weight of oxygen
= [2 X (1) + 2 X (16)] u
= 34 u
3) Al₂(SO₄)₃
The atomic weight of aluminium is 27u, sulphur is 32u while that of oxygen is 16 u. So
molecular weight of Al₂(SO₄)₃ = 2 X atomic weight of aluminium + 3 X atomic weight of sulphur + 12 X atomic weight of oxygen
= [2 X (27) + 3 X (32) + 12 X (12)] u
= 294 u
4) CO
The atomic weight of carbon is 12 u while that of oxygen is 16 u. So
molecular weight of CO = atomic weight of carbon + atomic weight of oxygen
= 12 + 16) u

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