Answer:
The atomic number represents the number of protons
Explanation:
Answer:
Ni^2+
Explanation:
The following data were obtained from the question:
Proton = 28
Electron = 26
Neutron = 34
Next, we shall determine the atomic number of the element.
Atomic number of an element is simply defined as the number of protons in the atom of an element.
Thus,
Atomic number = proton number
Proton = 28
Atomic number = proton number = 28
Atomic number = 28
Therefore, the element is Nickel since no two elements have the same atomic number.
Finally, we shall determine the charge on the Nickel atom as follow:
Proton = 28
Electron = 26
Charge on atom =
Charge on atom = Proton – Electron
Charge on atom = 28 – 26
Charge on atom = +2
Therefore, we can represent the Particle as Ni^2+
The combination sounds like it'd be a powerful disinfectant, but the two should never be mixed. "Together, they produce chlorine gas, which even at low levels, can cause coughing, breathing problems, and burning, watery eyes," says Forte.
Answer:
14.1391 g
Explanation:
The pH of a solution is defined as the negative of the hydrogen ion's concentration.
Thus,
pH = - log [H⁺]
Given that:
pH = 2.85
2.85 = - log [H⁺]
So,
<u>[H⁺] = 0.0014125 M</u>
Also, benzoic acid exists in equilibrium in water as:
C₆H₅COOH ⇄ C₆H₅COO⁻ + H⁺ Ka = 6.3×10⁻⁵
The ICE table is:
C₆H₅COOH ⇄ C₆H₅COO⁻ + H⁺
At t = 0 a 0 0
At t = teq a-x x x
The expression for Ka is:
Ka = 6.3×10⁻⁵ = [C₆H₅COO⁻][H⁺] / [C₆H₅COOH]
Also,
6.3×10⁻⁵ = x.x / (a-x)
x = [H⁺] = 0.0014125 M
6.3×10⁻⁵ = (0.0014125)² / (a-0.0014125)
<u>Solving, a = 0.3308 M</u>
Given volume = 350.0 mL = 350.0×10⁻³ L
So, Moles of benzoic acid = Concentration×Volume
<u>Moles = 0.3308×350.0×10⁻³ = 0.11578 moles</u>
Mass = Molar mass × moles
Molar mass of benzoic acid = 122.12 g/mol
So,
<u>Mass = 122.12 g/mol × 0.11578 moles = 14.1391 g</u>