Answer to Question #156170 in General Chemistry for jaidyn

Question

A sample of silver as it occurs in nature is 52.0% of isotope 47Ag107 and 48.0% of isotope 47Ag108. What is the average molar mass of silver? (Compare your result with the value given in the periodic table).

Answer 1

isotope 47Ag107 present 52.0%

isotope 47Ag108 present 48.0%

So, avarage molar mass = (107×52.0% + 108×48.0%) g/mol

= 107.48 g/mol

Hence the average molar mass of silver = 107.48 g/mol

107.86 g/mol is the mass in periodic table

So, the average molar mass of silver is (107.48/107.86) = 0.9965 times lesser than the mass of silver in periodic table.