The formula of a metallic oxide is MO. This oxide contains 60% by mass of the element M. The relative atomic mass of M is calculated to be: A. 8 B. 12 C. 24 D. 48 E. 84 Solution needed?

Question

Answer

Answer 12...M:O gives.. 60:40 gives...6:4...12:8.... equivalent weight of oxygen is 8 therefore equivalent mass of the metal is 12

Answer

Since it is objective question attempt it in this way take mass of M given and find the percentage of oxygen the option in which you will get 40% is correct option.

Answer

To find the relative atomic mass of element M in the metallic oxide MO, we need to consider the given information that the oxide contains 60% by mass of element M.

Let's assume the mass of the oxide MO is 100 grams.

1. Calculate the mass of element M in the oxide:
Since the oxide contains 60% by mass of element M, the mass of element M in the oxide is 60 grams (60% of 100 grams).

2. Determine the number of moles of element M:
To find the number of moles of element M, we need to divide the mass of element M by its molar mass.

3. Calculate the molar mass of element M:
The molar mass of element M can be determined by using the periodic table or other reliable sources. Let's assume the molar mass of element M is X grams/mol.

4. Calculate the number of moles of element M:
Number of moles = Mass of M / Molar mass of M
Number of moles = 60 grams / X grams/mol
Number of moles = 60 / X mol

5. Determine the molar mass of element M:
Since the oxide MO has the formula MO, it means it contains one atom of element M and one atom of oxygen.
The molar mass of MO is the sum of the molar masses of element M and oxygen (16 grams/mol).

6. Set up an equation using the molar mass of MO:
Molar mass of MO = Molar mass of M + Molar mass of oxygen
MO = X + 16
X = MO - 16

7. Substitute the calculated value of X into the equation for the number of moles:
Number of moles = 60 / X mol
Number of moles = 60 / (MO - 16) mol

8. Simplify the equation and solve for MO:
Since the oxide MO contains one atom of element M and one atom of oxygen, the molar mass of MO is equal to the sum of the molar masses of element M and oxygen.
MO = Molar mass of M + Molar mass of oxygen
MO = X + 16

9. Substitute the value of X in terms of MO into the equation for the number of moles:
Number of moles = 60 / (MO - 16) mol
Number of moles = 60 / (MO - 16) mol

10. Simplify the equation and solve for MO:
Number of moles = 60 / (MO - 16) mol
MO - 16 = 60 / Number of moles
MO = 60 / Number of moles + 16

Therefore, the relative atomic mass of element M, which is represented by MO, is calculated to be 60 / Number of moles + 16.

Since the options for the relative atomic mass are A. 8, B. 12, C. 24, D. 48, and E. 84, we cannot determine the exact value without knowing the number of moles.

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