Question

Two metallic oxides contain 27.6% and 30% oxygen respectively.If the formula of the first oxide is X3O4,that of the second will be?

Answer 1

Answer:

Two metallic oxides contain 27.6% and 30% oxygen respectively. If the formula of first oxide is M

3

O

4

, that of second will be:

ANSWER

Given that, the formula of first oxide =M

3

O4

Let mass of the metal = x

% of metal in M

3

O

4

=(3x/3x+64)×100

But as given percentage = (100-27.6) = 72.4 %

so, (3x/3x+64)×100=72.4

or x = 56.

In 2nd oxide,

oxygen = 30%....so metal = 70%

so, the ratio is

M : O

70/56 : 30/16

1.25: 1.875

2 : 3

so, 2nd oxide is M

2

O

3