Chemistry, asked by laishramsweetychanu, 4 months ago

A pure sample of calcium oxide contain calcium and oxygen in the ratio 5:2 by mass.how many grams of calcium will be required to combined with 32g of oxygen to form calcium oxide?

Answers

Answered by rsagnik437
7

Answer:-

80g of Calcium is required

Explanation:-

The balanced chemical equation for the reaction is :-

2Ca + O₂ → 2CaO

Now, it is given that the mass ratio between Calcium and Oxygen in CaO is 5:2 [Law of definite proportions]. So, we can understand that in CaO, 5g of Calcium will always react with 2g of Oxygen gas.

Hence,

∵ 2g O₂ → 5g Ca

So, 32g O₂ :-

= (32×5/2)g Ca

= 80g Ca

32g O 80g Ca

Some Extra Information:-

Law of definite proportions :-

This law can be stated as 'In a chemical substance, the elements are always present in definite proportions by mass'.

In a compound such as water, the ratio of mass of Hydrogen and Oxygen is always 1 : 8. Similarly, like it in Carbon dioxide, the mass ratio of Carbon and Oxygen is always 3 : 8 .

Answered by sushilasagolshem7
0

Answer:

80g of calcium will be required to combined

Explanation:

Ca+O2→CaO

By the question, we have

Ca:O=5:2

and Ca:O=32g

Now,

let x g be the ‘g’ of CA required to form CaO

5/2=x/32

=2x=5*32

=2x=160

=x=160/2

=x=80

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