From the following list of symbols, choose two elements that would likely form a molecular compound. Explain your choice.
Mg:
S:
K:
O:

Help plzz

O ( Oxygen )

because oxygen atom is a non metal and highly electronegative which reacts by itself to form a di-molecular compound of Oxygen

The balanced chemical equation is:

2H2 + O2 → 2H2O

Based on the reaction stoichiometry:

2 moles of water are formed.

Each water molecule has 2 O-H. Thus, a total of 4 O-H bonds are formed.

Energy released/O-H bond = 463 kJ/mol

For 4 O-H bonds this would be= 4 * 463 = 1852 kJ

Ans: Thus, -1852 kJ (negative sign indicates that energy is released) in the forming of O-H bonds.