Zinc metal reacts with oxygen to form solid zinc(ii) oxide, write a balance equation for this reaction

Zn + O2 ---› ZnO (Unbalanced)

2Zn + O2 ---› 2ZnO (Balanced)

The chemical equation needs to be balanced so that it follows the law of conservation of mass. 

★The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations.★

"A balanced chemical equation occurs when the number of the different atoms of elements in the reactants side is equal to that of the products side."

Butterfly wingspan is 7.7

Answer(28.02g/mol);