Answer:
semen
Explanation: truss this the answer
Actually Welcome to the concept of Atomic Structure.
Since, We all know that, To draw any Electron-Dot Structure, we always have to know the exact Number of valence or free electrons of any atom or molecule, hence
The Correct Answer is :-
D. Number of valence electrons.
Answer:
3.08 moles of CaF₂ and 3.08 mol of H₂SO₄
Explanation:
In order to produce HF we can assume this chemical reaction:
CaF₂ + H₂SO₄ → CaSO₄ + 2HF
1 mol of calcium fluoride can react to 1 mol of sulfuric acid in order to produce 1 mol of calcium sulfate and 2 moles of HF
In this case, ratio is 2:1 with both reactants. Let's make a rule of three:
2 moles of HF were produced by 1 mol of CaF₂ and 1 mol of H₂SO₄
Then, 6.16 moles of HF must be produced by:
(6.16 . 1) / 2 = 3.08 moles of CaF₂ and 3.08 mol of H₂SO₄
Molar mass Na = 23 g/mol
23 g ------------- 6.02 x 10²³ atoms
4.56 x 10⁻² g ----- ? atoms
atoms = 4.56 x 10⁻² x ( 6.02 x 10²³ ) / 23
atoms = 2.74 x 10²² / 23
= 1.19 x 10²¹ atoms
hope this helps!