Q1. A student investigated the law of conservation of mass
The law of conservation of mass states that the mass of the products is equal to the
mass of the reactants.
This is the method used.
1. Pour lead nitrate solution into a beaker labelled A.
2. Pour potassium chromate solution into a beaker labelled B.
3. Measure the mass of both beakers and contents.
4. Pour the solution from beaker B into beaker A
5. Measure the mass of both beakers and contents again.
When lead nitrate solution and potassium chromate solution are mixed, a reaction takes
place.

This is the equation for the reaction:
Pb(NO₂)(aq) + K.CrO.(aq)
(a). -> PbCrO.(s) + 2KNO.(aq)

Beaker A and contents before mixing: 128.71g
Beaker B and contents before mixing: 128.97g
Beaker A and contents after mixing: 154.10g
Beaker B after mixing: 103.58g

Show that the law of conservation of mass is true.
Use the data from the table above.