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
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 O₂ → 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 .
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