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8. A sample of 16.0g of a metal oxide, MO, is reduced to 12.8g of the metal, M.
What is the relative atomic mass, Ar, of M?

A 32 B 64 C 80 D 128

Sagot :

ukumarichaudhary

Answer:

B 64

Explanation:

i think b 64 is right answer.......

The relative atomic mass is 64g and the metal is copper(Cu).

What is relative atomic mass?

  • The weighted average of the masses of an element’s isotopes in comparison to the mass of a carbon-12 atom is known as relative atomic mass (Ar).
  • The ratio of the average mass of atoms of a chemical element in a given sample to the atomic mass constant is defined as relative atomic mass (Ar) or atomic weight.

The mole ratio for M and O in the compound MO is 1:1.

The mass of oxygen in the 16g compound is 16.0 - 12.8 = 3.2g.

The relative atomic mass of O is 16g. The number of moles of O in the 3.2g is 3.2/16 = 0.2.

Since the M and O gave the same number of moles in the MO, that is their mole ratio is 1:1, then the number of moles of the M in the MO is also 0.2.

Therefore, if 0.2 mole if M weighs 12.8g, then 1 mole of M will weigh 1 x 12.8/0.2 = 64g/mole.

The mole of an element is its relative atomic mass.

Therefore, the relative atomic mass of M is 64g.

Hence, option B is the correct answer.

To learn more about relative atomic mass here

https://brainly.com/question/22058365

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