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3 years ago

Explain why NOBLE gases do not for ions

Chemistry

1 answer:

Svetradugi [14.3K]3 years ago

5 0

Answer/Explanation:

They have very high ionization energies so they don't form ions. The noble gases are the least reactive of all the elements but the heavier ones do form some molecules. Helium and neon never form molecules. They have completely filled electron shells with no have-filled orbitals available for making covalent bonds

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Suppose "Element X" has a molar mass of 38.5 g/mol. How many atoms of Element X would be present in 2.78 mol?

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Answer:

16.74×10²³ atoms

Explanation:

Given data:

Number of moles of X = 2.78 mol

Number of atoms = ?

Solution:

According to Avogadro number.

1 mole of any substance contain 6.022×10²³ atoms. Thus,

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The number 6.022 × 10²³ is called Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

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3) (Solid magnesium carbonate mixed in a solution of dilute hydrochloric acid. Assume the

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Answer: The mass of magnesium carbonate that will be dissolved in the reaction is 6.99 g.

Explanation:

We are given:

Amount of heat released = 1950 J = 1.950 kJ (Conversion factor: 1 kJ = 1000 J)

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So, when 1.950 kJ of heat is released, then = $\frac{1mol}{23.4kJ}\times 1.950kJ=0.083mol$ of magnesium carbonate is dissolved

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