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3 years ago

14

Why is the periodic table not arranged by atomic weight and instead arranged by atomic number?

2 answers:

Liula [17]3 years ago

4 0

Atomic weight doesn't increase in a constant manner with respect to elements increase in atomic number.
Where as while taking about atomic number it increases in a specific manner so it's easy to arrange a periodic table .

At before Duberinor,Mendeleev tried to use atomic weight but they failed .

PolarNik [594]3 years ago

3 0

The chemical properties are mainly dependent on the electrons, or in some cases the charge of the protons, which is independent of the number of neutrons.So,they are arranged by increasing atomic number…

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Refer to the Chemical Compounds table above. How many total elements are in<br> Ethanol?

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3 element i.e carbon (C), hydrogen (H) and oxygen.

Explanation:

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3 years ago

A sample containing 2.30 mol of Ne gas has an initial volume of 8.00 L. What is the final volume, in liters, when the following

marta [7]

Answer:

a. 4,00L

b. 16,00L

c. 12,31L

Explanation:

Avogadro's law says:

$\frac{V_1}{n_1} =\frac{V_2}{n_2}$

a. If initial conditions are 2,30mol and 8,00L and you lose one-half of atoms, that means you have 1,15mol:

$\frac{8,00L}{2,30mol} =\frac{V_2}{1,15mol}$

<em>V₂ = 4,00L</em>

b. If initial conditions are 2,30mol and 8,00L and you add 2,30mol, that means you have 4,60mol:

$\frac{8,00L}{2,30mol} =\frac{V_2}{4,60mol}$

<em>V₂ = 16,00L</em>

c. 25,0g of Ne are:

25,0g × (1mol / 20,1797g) = 1,24 moles of Ne. That means you have 2,30mol - 1,24mol = 3,54mol of Ne

$\frac{8,00L}{2,30mol} =\frac{V_2}{3,54mol}$

<em>V₂ = 12,31L</em>

I hope it helps!

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