In the decomposition of water, how many liters of hydrogen gas are produced from 33.9 g of H2O?
2 H2O → 2 H2 + O2

For the reaction of C2H4(g) with O2(g) to form CO2(g) and H2O(g), what number of moles of CO2 can be produced by the reaction of 5.00 mol C2H4 and 13.6 mol O2? 9.07 mol Consider the reaction of magnesium metal with hydrochloric acid to produce magnesium chloride and hydrogen gas.

Explanation:

the electronic configuration of an atom with eight electrons is 1s²2s²2p⁴. the orbital diagrams are shown in the figure.

as per the hunds rule:

1. electrons tend to avoid being in the same orbital as per as practicable.

2. electrons in different orbitals of the same energy will have their spin parallel.

this can be illustrated from the multiplicity of the orbitals of the atom. as there are four electrons in the p orbital and p orbital has 3 sub-shells. the electrons can be fed in different ways as shown in the figure but the correct orbital diagram will be as per the hunds rule.