Question

What mass of a 3.25 wt- % solution of AgNO3 contains 2.50 g of silver?

= ____ g

Answer 1

Mass of silver = 2.5 g

Molar mass of silver = 107.86 g/mol

Moles of silver = 2.5 g / 107.86 g/mol = 0.023178 Moles

Moles of silver nitrate =  0.023178 Moles

Molar mass of silver nitrate =  169.87 g/mol  

Mass of siver nitrate = 0.023178 Moles  x 169.87 g/mol = 3.937 g

Weight % of the solution = 3.25 %

Mass of the solution = 3.937 x 100 / 3.25 = 121.13 gm

3.25 Wt % solution of 121.13 gm of the solution contains 2.50 g of silver