In chemistry and physics, the atomic number<span> of a chemical </span>element<span> (also </span>known<span> as its </span>proton number<span>) is </span>the number of protons<span> found in the nucleus of an </span>atom<span> of that </span>element<span>, and therefore identical to the charge </span>number<span> of the nucleus. It is conventionally represented by the symbol Z.</span>
Answer:
3.011 × 10²³ atoms of Al
Explanation:
Given data:
Number of moles of Al₂(SO₄)₃ = 0.25 mol
Number of atoms of Al = ?
Solution:
In one mole of Al₂(SO₄)₃ there are 2 moles of Al.
In 0.25 mol × 2 = 0.5 mol
1 mole of any substance contain 6.022 × 10²³ atoms.
In 0.5 moles of Al:
1 mole contain 6.022 × 10²³ atoms.
0.5 mol × 6.022 × 10²³ atoms/ 1 mol
3.011 × 10²³ atoms
Answer:
the last one: all three are examples of Newton's laws
Explanation:
i guess
