Chemistry, asked by riyaa07, 11 months ago

An oxide of metal M has 40% by mass of oxygen. Metal M has atomic mass of 24. The empirical formula of the oxide is
1. M2O
2. M2O3
3. MO
4. M3O4

Answers

Answered by Priyanka3353

Answer: The answer is M2O

Explanation: suppose you have 100g of metal oxide, then the mass of Oxygen will be 40g and the mass of metal will be 60 g.

For Oxygen :-

Given mass/molar mass =40 /32

=1.25moles

For Metal :-

Given mass/molar mass=60/24

=2.5moles

Now take the simple ratio

Oxygen:Metal =1.25:2.5

= 1:2

Therefore M20

riyaa07: Thank you

riyaa07: But the correct ans is MO!!

riyaa07: Oh got it

riyaa07: Instead of molar mass we have to use atomic mass as the question says for finding empirical formula

riyaa07: So instead of dividing the given mass by 32 we have to divide it by 16 which is oxygen’s atomic mass

Priyanka3353: Sorry, my bad... I wrote 32 by mistake.. Thanks for correcting me on this.... I really appreciate it

riyaa07: It’s ok ur welcome! And also I appreciate u helping me. Thank ya!!!

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