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Ostrovityanka [42]
3 years ago
7

What is the second most abundant element in stars? A. helium B. iron C. hydrogen D. oxygen

Chemistry
1 answer:
devlian [24]3 years ago
8 0
<span>The </span>abundance of a chemical element<span> is a measure of the </span>occurrence<span> of the </span>element<span> relative to all other elements in a given environment. Abundance is measured in one of three ways: by the </span>mass-fraction<span> (the same as weight fraction); by the </span>mole-fraction<span> (fraction of atoms by numerical count, or sometimes fraction of molecules in gases); or by the </span>volume-fraction<span>. Volume-fraction is a common abundance measure in mixed gases such as planetary atmospheres, and is similar in value to molecular mole-fraction for gas mixtures at relatively low densities and pressures, and </span>ideal gas<span> mixtures. Most abundance values in this article are given as mass-fractions.

</span>
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How many moles are in 0.456 g of chlorine
Mila [183]

Answer:

0.013 moles Cl

Explanation:

Grams --> Moles       Divide by Molar Mass

Molar Mass of Chlorine (Cl) is 35.5. This can be found on the Periodic Table.

Set Up:     (0.456 g Cl) (1 Cl / 35.5 g)

                0.456 g * 1 = 0.456

                0.456 / 35.5 = 0.01284507

                Round to 0.013

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Alisiya [41]
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3 years ago
An aluminum ion has a charge of +3, and an oxide has a charge of -2. What would be the product of a reaction between these two e
kozerog [31]

The product of a reaction between these two elements is Al_{2} O_{3}.

Explanation:

The oxidation state of an ion in a compound is equal to its charge.

The aluminum having a charge of +3 because oxidation state is +3

The oxide is having charge of -2

The product of these reactants will produce a chemical compound.

The compound formed is Al_{2} O_{3}  i.e Aluminium oxide. The compound while getting formed will share the charge and cation A+ will have the charge of anion and anion will have the charge of cation. This will result in a compound as there should be a neutral charge on the compound formed.

The <em>+</em><em>3 charge of the cation Al+ will go to anion oxide O2- and the charge of anion -2 will go with cation Al+. </em>

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What happens to energy over the course of a reaction?
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