The mass of iron (III) oxide (Fe2O3) : 85.12 g
<h3>Further explanation</h3>Given
3.20x10²³ formula units
Required
The mass
Solution
1 mole = 6.02.10²³ particles
Can be formulated :
N = n x No
N = number of particles
n = mol
No = 6.02.10²³ = Avogadro's number
mol of Fe₂O₃ :
mass of Fe₂O₃ (MW=160 g/mol)
Answer:
1. C = 0.73 M.
2. pH = 0.14
Explanation:
The reaction is the following:
HCl + NH₃ ⇄ NH₄⁺Cl⁻
From the titration, we can find the number of moles of HCl that were neutralized by the ammonia.
Where "a" is for acid and "b" is for base.
The number of moles is:
Where "C" is for concentration and "V" for volume.
Hence the initial concentration of the acid is 0.73 M.
The original pH of the acid is given by:
Therefore, the original pH of the acid is 0.14.
I hope it helps you!
