A silver ornament of mass ‘m’ gram is polished with gold equivalent to 1% of the mass of silver.

Monjur Alahi

A silver ornament of mass ‘m’ gram is polished with gold equivalent to 1% of the mass of silver. Compute the ratio of the number of atoms of gold and silver in the ornament.


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Salim Ahmed Kawsar

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Mass of silver = m g 

Mass of gold = m /100g 

Number of atoms of silver =  Mass/ Atomic mass X NA  

                                                   =  m /108NA  

Number of atoms of gold = m/ 100 X197  

Ratio of number of atoms of gold to silver = Au : Ag 

= m/ 100 X 197 X NA : m/ 108 NA

= 108 : 100×197 

= 108 : 19700 

= 1 : 182.41

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