Question

2 g of zinc metal is completely burnt in air to form zinc oxide. it was found that mass of zinc oxide is 2.5 g.find the mass of oxygen used to form zinc oxide .which law governs your answer​

Answer 1

Mass of zinc used = 2 g

Mass of zinc oxide = 2.5 g

Therefore, mass of oxygen used = 0.5 g ( mass of ZnO - mass of Zn)

This answer is governed by the law of conservation of mass which states that mass can neither be created nor destroyed in a chemical reaction. The total mass of the reactants is always equal to the total mass of the products.

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Answer 2

Answer:

mass of Oxygen used = mass of ZnO produced - mass of Zn taken

= 2.5 - 2

= 0.5 g