Read the following question and answer:
 
In a chemical reaction, 15 g of ammonium nitrate decomposes to form 6 g of nitrogen dioxide, 4 g of oxygen, and 5 g of water vapour. Show that these observations are in agreement with the law of conservation of mass.
 
Ammonium nitrate + Oxygen + water
15 g
 
Therefore, LHS = RHS

g = g

This shows that during a chemical reaction, 
 
\(=\) Mass of product