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I.
a).
\(1\) \(mole\) of gold and silver contain the same number of atoms.
  
b).
One \(H_2SO_4\) molecule is \(98\) times as heavy as \(1/12\)th of the mass of a carbon –\(12\).
 
II. 
Assertion (A)The Relative Molecular Mass of chlorine is \(35.5\) \(amu\).
Reason (R)
The natural abundance of chlorine isotopes are not equal.