I think its b or a
i hope i help
Answer:
look it up and it gives you the answer in one of the slides ;]
Explanation:
X, Y, and Z are elements.
An element is the smallest part of a substance that can exist on its own and can not be broken down into smaller unit.
From the question, W was broken down to give X, Y, Z. All three substances can not be broken down by chemical means.
The fact that X, Y and Z can not be broken down by chemical means implies that they are elements.
Learn more: brainly.com/question/13516179
Answer:
8.9x10¹⁷ atoms of Al are present
Explanation:
To find the number of atoms from the mass of an atom we must convert, as first, the mass to moles using the molar mass of the atom (26.98g/mol For Aluminium).
Then, we must convert the moles to atoms knowing that 1mol = 6.022x10²³ atoms.
<em>Moles Aluminium:</em>
4.0x10⁻⁵g * (1mol / 26.98g) = 1.483x10⁻⁶ moles Al
<em>atoms:</em>
1.483x10⁻⁶ moles Al * (6.022x10²³ atoms / mol) =
<h3>8.9x10¹⁷ atoms of Al are present</h3>
