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Click here👆to get an answer to your question ️ If NA is Avogadro's number, then number of valence electrons in 4.2 g of nitride ion ( N^3 - ) is. The number of carbon atoms in exactly 12 g is called Avogadro's number,.One mole is the amount of material which contains Avogradro's number of particle. These definitions emphasize that the mole refers to a fixed number of b Avogadro's number of atoms, electrons to refer to a mole of helium, a mole of electrons, or a mole of by Avogadro's number of atoms, electrons or ions respectively. Calculate an accurate value of Avogadro's number as the ratio of the electric charge on a mole of electrons (Faraday's constant) divided by the charge on a single electron. Faraday's constant = 96,485.3383 coulomb/mole Avogadro's number = 6.0221415 × 10(23) Charge of an electron = 1.60217646 × 10(-19) coulombs Now what do I do? 6.022 × 10 23 is known as the Avogadro Number or Avogadro Constant and is given the symbol N A (1) N = n × N A. N = number of particles in the substance n = amount of substance in moles (mol) N A = Avogardro Number = 6.022 × 10 23 particles mol-1. N = n × (6.022 × 10 23) To find the number of particles, N, in a substance: N = n × N A.

2.4 $N_A$

1.6$N_A$

Solution:

$14,g$ of $N^{3-}$ ions have valence electrons $=8N_{A}$
$4.2,g$ of $N^{3-}$ ions have valence electrons
$=frac{8N_{A}times 4.2}{14}=2.4,N_{A}$

1. A metal M (specific heat 0.16) forms a metal chloride with = 65% chlorine present in it. The formula of the metal chloride will be

2. Mass % of carbon in ethanol is

3. Which element has the highest first ionization potential?

4. Which statement(s) is (are) false for the periodic classification of elements?

5. The electronegativities of N, C, Si and P are in the order

6. The effective nuclear charge of an element with three valence electrons is 2.60. What is the atomic number of the element?

7. Identify the element that forms amphoteric oxide.

8. Which of the set of oxides are arranged in the proper order of basic, amphoteric, acidic ?

9. 5 moles of $AB^2$ weigh $125 times 10^{-3}; kg$ and 10 moles of $A_2B_2$ weigh $300 times 10^{-3} ; kg$. The molar mass of $A(M_A)$ and molar mass of $B(M_B) $ in kg mol$^{-1}$ are :

10. Which of the following is an example of Law of multiple proportion?

1. In Wolff‐Kishner reduction, the carbonyl group of aldehydes and ketones is converted into

2. Identify compound X in the following sequence of reactions:

3. Identify a molecule which does not exist.

4. Identify the incorrect match.

Name		IUPAC Official Name
A	Unnilunium	i	Mendelevium
B	Unniltrium	ii	Lawrencium
C	Unnilhexium	iii	Seaborgium
D	Unununnium	iv	Darmstadtium

5. Reaction between acetone and methyl magnesium chloride followed by hydrolysis will give :

6. Identify the correct statements from the following:
(a) $CO_2(g)$ is used as refrigerant for ice-cream and frozen food.
(b) The structure of $C_{60}$ contains twelve six carbon rings and twenty five carbon rings.
(c) $ZSM-5$, a type of zeolite, is used to convert alcohols into gasoline.
(d) $CO$ is colorless and odourless gas.

7. Which of the following set of molecules will have zero dipole moment ?

8. On electrolysis of dil.sulphuric acid using Platinum (Pt) electrode, the product obtained at anode will be:

9. An element has a body centered cubic (bcc) structure with a cell edge of 288 pm. The atomic radiusis:

If Avogadro Number Na Is Changed From 6.022

10. Find out the solubility of $Ni(OH)_2$ in 0.1 M NaOH. Given that the ionic product of $Ni(OH)_2$ is $2 times 10^{-15}$