Question

magnesium and oxygen combine in the ratio of 3 is to 2 by mass to form magnesium oxide what mass of Oxygen gas would be required to react completely with 24 grams of magnesium​

Answer 1

This problem can be solved according to Law of Chemical Combination -

As the amount of magnesium and oxygen are in ratio 3:2 .
So, amount of magnesium is 24 gm and let amount of oxygen be x.
=> 3:2
=> 24:x
3/2= 24/x
By cross multiplying ,we get
x= 16 gm

Answer 2

Answer:

16 g

Explanation:

The question can be solved through the Law of Conservation of mass.

As it is given in the question the mass of the Mg is in the ratio of 3:2 compared to the mass of $O_{2}$. So,

3x+2x = Mg + $0_{2}$

but 3x = 24g

=>    x = 8g

then, the mass of $O_{2\\}$ is 2x which is 2 multiplied by 8 = 16g

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