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Q. Total number of atoms represented by the compound $ CuS{{O}_{4}}.5{{H}_{2}}O $ is:

BHUBHU 2005

Solution:

Total number of atoms in
$ CuS{{O}_{4}}.5{{H}_{2}}O $ are $ 1+1+4+5(2+1)=6+5\times 3 $
$ =21 $
$ \therefore $ $ CuS{{O}_{4}}.5{{H}_{2}}O $ has 21 atoms.