A 5.0 L vessel containing salt water is cooled and the solution is transferred
into a holding tank. How many mL of
salt water are in the tank?

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.

they are all solids.

i think its 100.

hope this !