Question

19. Assertion: Atomic mass of aluminium is 27.
Reason: An atom of aluminium is 27 times heavier than 1/12th of the mass of
carbon-12 atom.​

Answer 1

Answer:

Hey there!

Aluminium has 13 protons and 14 neutrons

And we know that Atomic mass of an element is the sum of its protons and neutrons

Thus Atomic mass of aluminium is 27

In mole concept, scientists have defined 1u= 1/12th the mass of carbon-12 atom, so aluminium is 27 times 1/12th the mass of carbon-12 atom.

So,

Both statements are correct and the Reason is the correct explanation of Assertion.

Hope you understood!

please mark as Brainliest :)

Answer 2

Answer:

both assestion and reason is true and reason is the correct explaination of assertion