Answer:
1.99 x 10²³ formula units
Explanation:
Given parameters:
Mass of AgF = 42.15g
Unknown:
The amount of formula units
Solution:
To solve this problem, we set out by find the number of moles in this compound from the given mass.
Number of moles = 
molar mass of AgF = 107.9 + 19 = 126.9g/mol
Number of moles =
= 0.33 moles
1 mole of a substance = 6.02 x 10²³ formula units
0.33 moles of AgF = 0.33 x 6.02 x 10²³ = 1.99 x 10²³ formula units
BaSO₄(s) ⇄ Ba²⁺(aq) + SO₄²⁻(aq)
Ksp=[Ba²⁺][SO₄²⁻]
[Ba²⁺]=[SO₄²⁻]
Ksp=[Ba²⁺]²
Ksp=(1.76*10⁻³)² =3.0976×10⁻⁶ ≈3.1×10⁻⁶
Answer:
Sound waves transfer energy by the motion of particles
Explanation: guessing lol
litmus paper
Because it will just tell if the solution is acidic or basic, it won't tell the pH