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DIA [1.3K]
3 years ago
12

What is The charge of PbI2

Chemistry
2 answers:
4vir4ik [10]3 years ago
6 0

Answer:

Lead iodide (II) is an inorganic compound, lead salt and hydrogen acid, with the PbI2 formula.

stiv31 [10]3 years ago
6 0

Answer:

The charge of PbCl2 is 0.

This is the answer of your question.

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Hydroxylapatite, Ca10(PO4)6(OH)2, has a solubility constant of Ksp = 2.34 x 10^-59. Solid hydroxylapatite is dissolved in water
nadezda [96]

Answer:

The concentration of [Ca²⁺] is 8.47 x 10⁻³ M

Explanation:

We consider the solubility of hydroxyapatite,

Ca₁₀(PO₄)₆(OH)₂ ⇔ 10Ca²⁺ + 6PO₄³⁻ + 2 OH⁻

Assumed that there is <em>a</em> mol of hydoxyapatite disolved in water, yielding <em>10a</em> mol Ca²⁺ of  and <em>6a</em> mol of PO₄³⁻

We also have Ksp equation,

Ksp = [Ca²⁺]¹⁰ x [PO₄³⁻]⁶ x [OH⁻]² = 2.34 x 10⁻⁵⁹

     ⇔  10a¹⁰ x 6a⁶ x (5.30 x 10⁻⁶)² = 2.24 x 10⁻⁵⁹

     ⇔  60a¹⁶                                    = 2.24 x 10⁻⁵⁹ / 5.30 x 10⁻¹²

     ⇔  a¹⁶                                         = 0.007 x 10⁻⁴⁷ = 7 x 10⁻⁵⁰

     ⇔  a                                           = \sqrt[16]{7 . 10^{-50} } =  8.47 x 10⁻⁴

Hence,

[Ca²⁺] = 10<em>a</em> = 8.47 x 10⁻³ M

3 0
4 years ago
What is added to make solid ice change to liquid water and then to gaseous steam.
vekshin1

Answer: heat

Explanation: if solid ice is heated it becomes in liquid  and then to  gaseous steam.

8 0
3 years ago
The heat of vaporization of acetic acid is . Calculate the change in entropy when of acetic acid condenses at .
Umnica [9.8K]

The question is incomplete, the complete question is;

The heat of vaporization ΔHv of acetic acid HCH3CO2 is 41.0 /kJmol. Calculate the change in entropy ΔS when 954.g of acetic acid condenses at 118.1°C. Be sure your answer contains a unit symbol. Round your answer to 3 significant digits.

Answer:

-1.67 JK-1

Explanation:

Since Heat of vaporization of acetic acid = 41.0 kJ/mol

Therefore:

Heat of condensation of acetic acid = -41.0 kJ/mol

Mass of acetic acid = 954 g

Temperature of condensation = 118.1 °C or 391.1 K

Number of moles of acetic acid = 954 g/60g/mol = 15.9 moles

Heat evolved during condensation = 15.9 moles *  -41.0 kJ/mol = -651.9 KJ

Entropy change (ΔS) = Heat evolved/ Temperature = -651.9 KJ/391.1 K

Entropy change (ΔS) = -1.67 JK-1

8 0
3 years ago
¿cuántas partículas elementales hay en 20g de Ca?​
snow_lady [41]

Answer:

la esperanza ayuda

Explanation:

Cuando se utiliza el mol deben especificarse las entidades elementales de que se trata. ... ¿Cuántas partículas (moléculas) de oxígeno (O2) hay en una mol de dicho gas? ... 20 g de Fe; 20 g de S; 20 g de oxígeno; 20 g de Ca; 20 g de CaCO3.

5 0
3 years ago
How many atoms of iron (Fe) are in a sample of 7.38 mol Fe?
yaroslaw [1]
7.38mol Fe(6.022x10^23 over 1 mol)= 44.4x10^23 but now you need to move the decimal because 44 isn’t between 1 & 9.
4.44x10^24
5 0
4 years ago
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