1. Solid ammonium chloride reacts with aqueous calcium hydroxide to yield aqueous calcium chloride, gaseous ammonia (NH), and liquid water.

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.

a

c) should be the answer.