Question

How many grans of lithium nitrate will be formed from 50.0 mL of 2 M lithium bromide? What is the molarity of a silver nitrate solution if the reaction of 200 mL of silver nitrate solution with an excess of lithium bromine produces 1.3 moles of silver bromide?

Answer 1

moles of LiBr2 = moles of Li(NO3)2

moles of LiBr = molarity x volume

                       = 2 x 50 / 1000

                      = 0.1

molar mass of LiNO3 = 68.9 g / mol

mass of LiNO3 = 0.1 x 68.9

                        = 6.89 g

AgNO3 ---------------------------> AgBr

moles of AgNO3 = moles of AgBr

moles of AgNO3 = 1.3

volume =200mL = 0.2 L

molarity = moles ./ volume

             = 1.3 / 0.2

           = 6.5 M

molarity of AgNO3 = 6.5 M