Answer:
(i) \[\because \] 1 mole \[{{C}_{2}}{{H}_{6}}\]
contains 2 mole carbon atoms
\[\therefore \] 3
mole \[{{C}_{2}}{{H}_{6}}\] will contain 6 mole carbon atoms
(ii) \[\because
\]1 mole \[{{C}_{2}}{{H}_{6}}\]contains 6 moles of hydrogen atoms
\[\therefore
\] 3 mole \[{{C}_{2}}{{H}_{6}}\]will contain 18 moles of
hydrogen
atoms
(iii) 3 mole of \[{{C}_{2}}{{H}_{6}}\]
will contain \[3\text{ }\times \text{ }6.023\text{ }\times \text{ }{{10}^{23}}\]
molecules
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