i. The dissolution of PbSO₄ in water entails its ionizing into its constituent ions:

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ii. Given the dissolution of some substance
,
the Ksp, or the solubility product constant, of the preceding equation takes the general form
.
The concentrations of pure solids (like substance A) and liquids are excluded from the equilibrium expression.
So, given our dissociation equation in question i., our Ksp expression would be written as:
.
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iii. Presumably, what we're being asked for here is the <em>molar </em>solubility of PbSO4 (at the standard 25 °C, as Ksp is temperature dependent). We have all the information needed to calculate the molar solubility. Since the Ksp tells us the ratio of equilibrium concentrations of PbSO4 in solution, we can consider either [Pb2+] or [SO4^2-] as equivalent to our molar solubility (since the concentration of either ion is the extent to which solid PbSO4 will dissociate or dissolve in water).
We know that Ksp = [Pb2+][SO4^2-], and we are given the value of the Ksp of for PbSO4 as 1.3 × 10⁻⁸. Since the molar ratio between the two ions are the same, we can use an equivalent variable to represent both:

So, the molar solubility of PbSO4 is 1.1 × 10⁻⁴ mol/L. The answer is given to two significant figures since the Ksp is given to two significant figures.
Explanation:
Reliability can be improved by completing each temperature more than once and calculating an average.
In the given <span>phase diagram, the line segment that describes the interface between solid and vapor is A-B. The rest of the choices do not answer teh question above</span>
Answer:
9.52g of N2
Explanation:
The equation of the reaction is given as;
2NO(g) + 2H2(g) → N2(g) + 2H2O(l)
From the stochiometry of the reaction;
2 mol : 2 mol : 1 mol : 2 mol
60g : 4g : 28g :
(
Mass = Number of moles * Molar mass)
Converting the masses given to moles;
Number of moles of NO = mass / molar mass = 20.4 / 30 = 0.68
Number of moles of H2 = mass / molar mass = 5.10 / 2 = 2.55
In this reaction, the limiting reactant is NO
60g of NO produces 28g of N2,
20.4g of NO would produce xg of N2
60 = 28
20.4 = X
X = (20.4 * 28) / 60
X = 9.52g
Answer:
Eu não falo português, usei o Google Translate. Desculpe se o texto está incorreto!
Explanation:
A corrente é um fluxo de carga. A corrente é medida através de um componente. Diferença potencial é a energia usada entre dois pontos em um circuito.