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Dmitrij [34]
3 years ago
12

What is the mass of 2.23 × 10^23 atoms of aluminum?​

Chemistry
1 answer:
rjkz [21]3 years ago
7 0

Answer:

10

Explanation:

In image

Take atomic mass or molar mass

of Al =27

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I think what '13C' means is the isotope of carbon with mass number of 13. Its mass is 13 amu. The unit amu is equivalent to g/mol. The average atomic mass of Carbon is actually 12. But since we are solving for this particular isotope, we use a molar mass of 13 g/mol.

2 g C-13 * 1 mol/13 g = 0.154 moles of C-13
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4 years ago
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Which of the following are ionic, and which are molecular? (a) Sc2O3 ionic molecular (b) NaI ionic molecular (c) SCl2 ionic mole
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Answer :

Ionic compound : (a), (b), (d), (e), (f), (g) and (h)

Molecular compound : (c)

Explanation :

Ionic compound : It is defined as the compound which is formed when electron gets transferred from one atom to another atom.

Ionic compound are usually formed when a metal reacts with a non-metal.

Covalent compound : It is defined as the compound which is formed by the sharing of electrons between the atoms forming a compound.

The covalent compound are usually formed when two non-metals react.

All the polyatomic ions always form an ionic compound.

Polyatomic ions : It is a charged species that composed of two or more atoms and these charged species are bonded by the covalent bond.

As we know that the molecular compounds are the covalent compounds.

(a) Sc₂O₃

This is an ionic compound because it is made up of scandium metal and oxygen non-metal elements.

(b) NaI

This is an ionic compound because it is made up of sodium metal and iodine non-metal elements.

(c) SCl₂

This is an molecular compound because it is made up of sulfur and chlorine non-metal elements.

(d) Ca(NO₃)₂

This is an ionic compound because it is made up of calcium metal and polyatomic ion (NO_3^-) non-metal elements.

(e) FeCl₃

This is an ionic compound because it is made up of iron metal and chlorine non-metal elements.

(f) LaP

This is an ionic compound because it is made up of lanthanum metal and phosphorous non-metal elements.

(g) CoCO₃

This is an ionic compound because it is made up of cobalt metal and polyatomic ion (CO_3^{2-}) non-metal elements.

(h) (NH₄)₂SO₄

This is an ionic compound because it is made up of ammonium ion and sulfate ion.

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Answer:

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Explanation:

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An Exothermic reaction releases energy into the surroundings and so the products have more potential energy then the reactants. The enthalpy change is a negative value. Whereas, an endothermic reaction involves the absorption of energy into the system and so the reactants have more potential energy than the products. The enthalpy change is a positive value. This is clearly represented in energy profile diagrams.
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