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# when 5 g of calcium is burnt in 2 g of oxygen, then 7 g of calcium oxide is produced. what mass of calcium oxide will be produced when 5 g of calcium is burnt in 20 g of oxygen?

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get when 5 g of calcium is burnt in 2 g of oxygen, then 7 g of calcium oxide is produced. what mass of calcium oxide will be produced when 5 g of calcium is burnt in 20 g of oxygen? from screen.

## When 5g of Calcium is burnt in 2g of Oxygen then 7g of Calcium oxi

When 5g of Calcium is burnt in 2g of Oxygen then 7g of Calcium oxide is produced. What mass of calcium oxide will be produced when 5g of calcium reacts with 20g of oxygen? A 7g B 2g C 25g D 4g

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## A  correct answer is 7gExplanation:When 5g of calcium is burnt in 2g of oxygen we get 7g of calcium oxide  From this we understand that calcium  and oxygen combine in the ratio 5:2.   Hence when 5g of calcium is burnt in 20g of oxygen it will produce only 7g of calcium oxide.  This is in accordance with law of constant proportions.

When 5g of calcium is burnt in 2g of oxygen, then 7 g of calcium oxide of produced. What mass of calcium oxide will be produced when 5g of calcium is burnt in 20 g of oxygen ? Which law of chemical combination will govern your answer ?

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## When 5 g of calcium is burnt in 2 g of oxygen then 7 g of calcium oxide is produced. What mass of calcium oxide will be produced when 5 g of calcium is burnt in 20 g of oxygen? Which law of chemical combination will govern your answer?

When 5 g of calcium is burnt in 2 g of oxygen then 7 g of calcium oxide is produced. What mass of calcium oxide will be produced when 5 g of calcium is burnt in 20 g of oxygen? Which law of chemical combination will govern your answer?

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When 5 g of calcium is burnt in 2 g of oxygen then 7 g of calcium oxide is produced. What mass of calcium oxide will be produced when 5 g of calcium is burnt in 20 g of oxygen? Which law of chemical combination will govern your answer?

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When 5g of calcium is burnt in 2g of oxygen then 7g of calcium oxide is produced. What mass of calcium oxide will be produced when 5g of calcium is burnt in 20g of oxygen? Which law of chemical combination will govern your answer?

Open in App Solution

According to law of conservation of mass; the total mass of is constant during a chemical reaction, i.e, total mass of reactant = total mass of products.

Thus, any reaction can occur only when the mass of reactant used and product formed are equal.

Using the law of constant proportions, calcium and oxygen react in a fixed ratio.

When 5g of calcium is burnt in 2g of oxygen then 7g of calcium oxide is produced.

2 C a + O 2 ⟶ 2 C a O 5g 2g 7g

For the formation of CaO

7g of calcium oxide will be formed when 5g of calcium will react with 20g of oxygen. The remaining oxygen will remain unreacted.

As Ca and O 2

will react in the fixed ratio, hence follows the law of constant proportion.

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SIMILAR QUESTIONS

Q. When

3.0 g

of carbon is burnt in

8.00 g oxygen, 11.00 g

of carbon dioxide is produced? What mass of carbon dioxide will be formed when

3.00 g

of carbon is burnt in

50.00 g

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## When 5 G of Calcium is Burnt in 2 G of Oxygen, Then 7 G of Calcium Oxide is Produced. What Mass of Calcium Oxide Will Be Produced When 5 G of Calcium is Burnt in 20 G of Oxygen ? Which Law of

When 5 G of Calcium is Burnt in 2 G of Oxygen, Then 7 G of Calcium Oxide is Produced. What Mass of Calcium Oxide Will Be Produced When 5 G of Calcium is Burnt in 20 G of Oxygen ? Which Law of

When 5 g of calcium is burnt in 2 g of oxygen, then 7 g of calcium oxide is produced. What mass of calcium oxide will be produced when 5 g of calcium is burnt in 20 g of oxygen ? Which law of chemical combination will govern your answer ?

### SOLUTION

5g of calcium react with 2g of oxygen to form 7g of calcium oxide.

This problem can be solved using the law of constant proportions.

We know that calcium and oxygen react in a fixed ratio of 5:2, by mass, to produce 7g of calcium oxide. When 5g of calcium react with 20g of oxygen, the same amount of calcium oxide will be formed.

Therefore, 7g of calcium oxide will be formed when 5g of calcium will react with 20g of oxygen. Calcium and oxygen will react in a ratio of 5:2. The remaining oxygen will remain unreacted.

The law of constant proportions governs our answer.

Concept: Laws of Chemical Combination - Law of Constant Proportions or Law of Definite Proportions

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Chapter 3: Atoms and Molecules - Very Short Answers [Page 132]

Q 79 Q 78 Q 80

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Lakhmir Singh Class 9 Chemistry - Science Part 2

Chapter 3 Atoms and Molecules

Very Short Answers | Q 79 | Page 132

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