1.

(a) Define polyatomic ions. Write an example. (b) Calculate the formula unit mass of CaCO_(3) (Atomic mass of C=12u, Ca=40u, O=16u) (c) Calculate the molecular mass of the following (i) HNO_(3) (ii)CH_(3)COOH Atomic mass of H=14N, N=14u, O=16u, C=12u

Answer»

Solution :(a) Polytomicionsare the IONS represting a group of atoms whichcarry eitherpostivite or negative charge.
For example, `(SO_(4))^(2-)` ions .
(b)Formula units mass of `CaCO_(3) = ( 1xx"Atomicmass of Ca") + ( 1 xx "Atomic mass ofC")+ ( 3 xx "Atomic mass of O")`
` = 4 (1xx 40 u) + (1xx12 u) + (3 xx 16U) = 100u`
(c) Molecularmass of `CH_(3)COOH = (2xx "Atomic mass of C")+( 4 xx "Atomic mass of H") +(2 xx "Atomic mass of O")`
`=(2 xx 12 u) + (4 xx 1 u) + (2 xx 16 u) = 60u`


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