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Sauron [17]
3 years ago
8

1. Which out of the following elements has the lowest electronegativity: Lithium, Beryllium, Magnesium, Sodium

Chemistry
1 answer:
lidiya [134]3 years ago
6 0
  1. The element Sodium (Na) has a low electronegativity of the following elements.
  2. The element Beryllium (Be) has the least metallic character.
  3. The element Sodium (Na) has the largest atom.

<u>Explanation:</u>

  • Sodium (Na) which is a delicate, shimmering white, profoundly responsive soluble base metal loses an electron to a chlorine iota since it has seven electrons in its valence shell.
  • It needs one more electron to turn into a steady molecule. It has the most reduced electronegativity of the given components.
  • Beryllium (Be) is a light, silver-gray, relatively soft metal that is strong but brittle has the least metallic character of the given elements.
  • Since from left to right in a period, Metallic character decreases while nonmetallic character increases from top to bottom.
  • Sodium(Na) is the largest atom among the given elements since Atomic size decreases across a period from left to right and increases from top to bottom.
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A generic salt, AB 2 , has a molar mass of 345 g/mol and a solubility of 8.70 g/L at 25 °C. AB 2 (s) − ⇀ ↽ − A 2 + (aq) + 2B − (
Brrunno [24]

Answer : The value of K_{sp} of the generic salt is, 1.60\times 10^{-5}

Explanation :

As we are given that, a solubility of salt  is, 8.70 g/L that means 8.70 grams of salt present in 1 L of solution.

First we have to calculate the moles of salt (AB_2)

\text{Moles of }AB_2=\frac{\text{Mass of }AB_2}{\text{Molar mass of }AB_2}

Molar mass of AB_2 = 345 g/mol

\text{Moles of }AB_2=\frac{8.70g}{345g/mol}=0.0252mol

Now we have to calculate the concentration of A^{2+}\text{ and }B^-

The equilibrium chemical reaction will be:

AB_2(s)\rightleftharpoons A^{2+}(aq)+2B^-(aq)

Concentration of A^{2+} = \frac{0.0252mol}{1L}=0.0252M

Concentration of B^- = \frac{0.0252mol}{1L}=0.0252M

The solubility constant expression for this reaction is:

K_{sp}=[A^{2+}][B^-]^2

Now put all the given values in this expression, we get:

K_{sp}=(0.0252M)\times (0.0252M)^2

K_{sp}=1.60\times 10^{-5}

Thus, the value of K_{sp} of the generic salt is, 1.60\times 10^{-5}

8 0
3 years ago
The molar heat capacity of a compound with the formula C2H6SO is 88.0 J/mol-K. The specific heat of this substance is __________
lisabon 2012 [21]

Answer : The specific heat of this substance is, 1.13 J/g.K

Explanation :

Molar heat capacity : It is defined as the amount of heat absorbed by one mole of a substance to raise its temperature by one degree Celsius.

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Now we have to calculate the specific heat of this substance.

Specific heat of this substance = \frac{\text{Molar heat capacity of a compound}}{\text{Molar mass of }C_2H_6SO}

Specific heat of this substance = \frac{88.0J/mol.K}{78g/mol}

Specific heat of this substance = 1.13 J/g.K

Thus, the specific heat of this substance is, 1.13 J/g.K

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