Answer:
5
Explanation:
According to the Law of Conservation of Matter, the mass of the products in a chemical reaction must equal the mass of the reactants.
5O2 = 10 Oxygen atoms
In 2POx there must be 10 Oxygen atoms too. => x = 5
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Hope it can help you.
The net force is the vector sum of the two forces, since they’re acting in opposite directions one is negative (left) so
-5 + 7 = 2 to the right
Magnitude is 2
Direction is right
Answer:
pH = 4.27. Porcentaje de disociación: 0.03%
Explanation:
El pH de un ácido débil, HX, se obtiene haciendo uso de su equilibrio:
HX(aq) ⇄ H⁺(aq) + X⁻(aq)
Donde la constante de equilibrio, Ka, es
Ka = 1.65x10⁻⁸ = [H⁺] [X⁻] / [HX]
Como los iones H⁺ y X⁻ vienen del mismo equilibrio podemos decir:
[H⁺] = [X⁻]
[HX] es:
20g * (1mol/55g) = 0.3636moles / 2.100L = 0.1732M
Reemplazando es Ka:
1.65x10⁻⁸ = [H⁺] [H⁺] / [0.1732M]
2.858x10⁻⁹ = [H⁺]²
5.35x10⁻⁵M = [H⁺]
pH = -log[H⁺]
<h3>pH = 4.27</h3>
El porcentaje de disociacion es [X⁻] / [HX] inicial * 100
Reemplazando
5.35x10⁻⁵M / 0.1732M * 100
<h3>0.03%</h3>
Answer:
Stirring the salt and water
Crushing the salt so the grains are smaller
Explanation:
Another way that is not in the choices that would increase the rate of dissolving of a solute in the solvent is heating the solvent. This increases the kinetic energy of the particles hence increasing collision rates. This helps increase the dissolution of the solute.
Stirring helps break down the solute to smaller particles. Smaller particles have a larger surface area to volume ration on which collision with solvent molecule can occur hence faster dissolution.
