How many moles of h are there in 1 dm3 of 0.5m solution

Moles of H = 0.5 moles

Explanation:

Molarity = It is defined as the moles of the solute present in one litre of the solution. It is used to measure the concentration of the solution. Molarity is represented by "M".

0.5 M means = 0.5 moles are present in one litre of the solution

Volume = 1 dm3 =1 litre

1 litre = 1 dm 3 ( both are equal )

Calculation:

Moles = 0.5 mole

Hence ,

0.5 ,moles of H are present in 0.5M of the solution.

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.

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.