Question

Calcium metal combines with oxygen to produce Calcium oxide. If 80.0gm of Calcium
yields 112gms of Calcium oxide, how many grams of oxygen will be needed? Which law of
chemical combination helped you to solve it?

Answer 1

Answer:

32 g of oxygen.

Explanation:

mass of reactant is equal to mass of product.

Answer 2

Answer :-

32 grams of Oxygen are required .

'Law of Conservation of mass' helped us to solve this problem.

Explanation :-

We have :-

→ Mass of Calcium = 80 g

→ Mass of Calcium Oxide = 112 g

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The balanced equation is :-

2Ca + O₂ → 2CaO

Here :-

• Ca [Calcium] and O₂ [Oxygen] are reactants.

• CaO [Calcium oxide] is product.

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According to 'Law of Conservation of mass', we know that :-

Mass of reactants = Mass of products

Let the required mass of oxygen be 'x' grams.

⇒ 80 + x = 112

⇒ x = 112 - 80

⇒ x = 32 g