1.

Calculate the gram molar mass of the following. (i) H_(2)O (ii) CO_(2) (iii) Ca_(3)(PO_(4))_(2)

Answer»

Solution :(i) `H_(2)O`
`"Atomic MASSES of H"=1, O=16`
`"Gram molar MASS of "H_(2)O=(1xx2)+(16xx1)`
`=2+16`
`"Gram molar mass of "H_(2)O=18g`
(ii) `CO_(2)`
`"Atomic masses of C"=12, O=16`
`"Gram molar mass of "CO_(2)=(12xx1)+(16xx2)`
`=12+32`
`"Gram molar mass of "CO_(2)=44g`
(iii) `Ca_(3)(PO_(4))_(2)`
`"Atomic masses of CA"=40, P=30, O=16`.
`"Gram molar mass of "Ca_(3)(PO_(4))_(2)=(40xx3)+[30+(16xx4)]xx2`
`=120+(94xx2)`
`=120+188`
`"Gram molar mass of "Ca_(3)(PO_(4))_(2)=308g`


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