Long form EC for Aluminum

Answer:

In 4.56 moles of LiCl 27.46*10^23 formula units is present.    

Explanation:

Formula units is defined as the empirical formula for any ionic, covalent and  network solid compounds which are used as a single unit for stoichiometric calculations. Also It can be defined as the lowest whole number ratio of ions which can be represented in an ionic compound.

We are given

4.65 moles of Lithium chloride.

One mole of Lithium chloride has 6.022*10^23 unit  Formula unit

In 4.56 moles of Lithium Chloride the formula unit will be

              = 4.56*6.022*10^23

Formula units    = 27.46 * 10^23

It is clear that in 4.56 moles of Lithium Chloride will contain 27.46*10^23 Formula unit.

Therefore in 4.56 moles of LiCl 27.46*10^23 formula units is present.    

NH3(g) + CH4(g) ⇒ HCN + 3H2 ∆ H:255.95  kJ/mol

Given

Reaction and the enthalpy

Required

The change of enthalpy

Solution

Reaction 1

N2 (g) + 3H2 (g) --> 2NH3 ∆ H: -91.8 kJ/mol⇒reverse

2NH3 ⇒ N2 (g) + 3H2 (g) ∆ H: +91.8 kJ/mol

Reaction 2

C (s, graphite) + 2H2 (g)⇒ CH4 (g) ∆H: -74.9 kJ/mol ⇒reverse

CH4 (g) ⇒ C (s, graphite) + 2H2 (g) ∆H: +74.9 kJ/mol ⇒ x2

2CH4 (g) ⇒ 2C (s, graphite) + 4H2 (g) ∆H: +149.8 kJ/mo

Reaction 3

H2 (g) + 2C (s, graphite) + N2 (g) ⇒ 2HCN (g);∆ H: +270.3 kJ/mol

Add up all the reactions and remove the same compound from different sides :

2NH3 ⇒ N2 (g) + 3H2 (g) ∆ H: +91.8 kJ/mol

2CH4 (g) ⇒ 2C (s, graphite) + 4H2 (g) ∆H: +149.8 kJ/mol

H2 (g) + 2C (s, graphite) + N2 (g) ⇒ 2HCN (g) ∆ H: +270.3 kJ/mol

-----------------------------------------------------------------------------------------

2NH3(g) + 2CH4(g) ⇒ 2HCN + 6H2 ∆ H: 511.9 ⇒ :2

NH3(g) + CH4(g) ⇒ HCN + 3H2 ∆H:255.95

Answer:

The answer is A 83.33 g Ne

Explanation:

Used Avogadros Law

Answer:

this comic was pretty funny

Another product: CO₂

Given

Reaction

2C₄H₁₀ + 13O₂⇒ 8__+ 10H₂O

Required

product compound

Solution

In the combustion of hydrocarbons there can be 2 kinds of products

If there is excess Oxygen, you will get Carbon dioxide(CO₂) and water in the product

If Oxygen is low, you'll get Carbon monoxide(CO) and water

Or in other ways, we can use the principle of the law of conservation of mass which is also related to the number of atoms in the reactants and in the products

if we look at the reaction above, there are C atoms on the left (reactants), so that in the product there will also be C atoms with the same number of C atoms on the left

2C₄H₁₀ + 13O₂⇒ 8CO₂+ 10H₂O

Answer:

is C. CO2

Explanation:

Answer:

Viruses can be seen with a compound light microscope.

Viruses vary greatly in size and structure

Some viruses use the cell's machinery to replicate more viruses

Explanation:

Answer:

water

Explanation:

Oxygen has 6 valence electrons, hydrogen has just one. Elements want to gain or lose electrons to complete their valence shells of eight electrons.

When oxygen combine with hydrogen it needed two electrons to complete the octet that's why two hydrogen atoms are combine with one atom of oxygen.

2H₂ + O₂ → 2H₂O

Both share the electron and form covalent bond because electrons are not equally share.

Covalent bond:

It is formed by the sharing of electron pair between bonded atoms.  

The atom with larger electronegativity attract the electron pair more towards it self and becomes partial negative while the other atom becomes partial positive.

For example:

In water the electronegativity of oxygen is 3.44 and hydrogen is 2.2. That's why electron pair attracted more towards oxygen, thus oxygen becomes partial negative and hydrogen becomes partial positive.

Answer:

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Periodic table

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WRITTEN BY

J.J. Lagowski See All Contributors

Professor of Chemistry, University of Texas at Austin. Author of The Chemical Bond.

See Article History

Alternative Title: periodic table of the elements

Study chemistry's periodic law to understand elements' properties and how they relate to one another

Study chemistry's periodic law to understand elements' properties and how they relate to one another

Explanation of the periodic table.

Encyclopædia Britannica, Inc.

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Periodic table, in full periodic table of the elements, in chemistry, the organized array of all the chemical elements in order of increasing atomic number—i.e., the total number of protons in the atomic nucleus. When the chemical elements are thus arranged, there is a recurring pattern called the “periodic law” in their properties, in which elements in the same column (group) have similar properties. The initial discovery, which was made by Dmitry I. Mendeleyev in the mid-19th century, has been of inestimable value in the development of chemistry.

periodic table

Explanation:

need thanks and make me brainiest if it helps you

Answer:

False

Explanation:

Answer:Terms in this set (17)

T/F Mohawk war chief Joseph Brant was one of the few Native Americans who sided with the Patriots. ... After George Rogers Clark captured Vincennes, it remained in Patriot control. True. After Vincennes was recaptured by the British, George Rogers Clark captured it again in a surprise attack.

Explanation:

Answer:

Write the mole rato/Write the complete balanced chemical equation

Explanation:

there are two form of this question but only one of these answers will show up.

The stoichiometric calculations has been based on the writing of the balanced chemical equation. Thus option C is correct.

Stoichiometric calculations has been based on the chemical equation for a reaction. The stoichiometric chemical in a balanced chemical equation has helped in the calculation of the moles of the compounds involved in the chemical equation.

The complete stoichiometric calculations has been performed with the molecular mass of the compounds, and has been completed with the balanced chemical equation. Thus, option C is correct,

For more information about the stoichiometric calculation, refer to the link;

https://brainly.com/question/2563006

Answer:

i learnt that the different result that i got can be prepared through my experiment. if that result is useful for anywork or for me then i can note down my procedure and use it again to get that result . And while noting it down i will know about the mistake that i did due to which i got different result and i can do correction of it in next time.

Answer:

the answer should be Lake

Answer: D

Explanation:

Answer:

The differemt isotopes that differ in atomic mass

Explanation:

Answer:

Explanation:

Be has a full 2s orbital whereas Li has a paramagnetic orbital; i.e., incomplete orbital which serves to need an electron to fill while Be does not.

The electron affinity of Be is higher than Li, as Be has been shielded with high energy than Li.

The electron affinity has been defined as the energy required to add an electron to the ground state of the atom.

The nonmetal has easily able to gain the electron and thus have low electron affinity, while metals have high electron affinity.

On moving from Li to Be there has been an addition of the electron. The electron addition in Be has been more difficult as the coming electron is shielded from the core elements strongly.

Thus, the electron affinity of Be is higher than Li, as Be has been shielded with high energy than Li.

For more information about Electron affinity, refer to the link:

https://brainly.com/question/977718

Answer:

here

Explanation:

a pure substance consists only of one element or one compound. a mixture consists of two or more different substances, not chemically joined together.

Answer:

because it melting point is low

Answer:

Alcohol evaporates because of its vapor pressure and therefore, its molecule lying at the surface of alcohol (liquid-gas boundary) breaks its hydrogen bonding and tends to escape out of the alcohol solution. It should be noted that alcohol evaporates at a faster rate than water.

Answer:

Explanation:

what wheres the answer???

Answer:

false

Explanation:

Avogadro's number : the number of units in one mole: 6.022 × 1023, which is the number of atoms in 12 grams of carbon-12.

Answer:

false

Explanation:

i took the test.

The pH of the solution B will be 10.  

• One of the indicators that helps the chemists to determine visually that whether the substance is an acid or a base is the phenolphthalein.  

• The phenolphthalein changes color due to ionization, and this changes the shape of the molecules of phenolphthalein.  

• Naturally, phenolphthalein is colorless, however, it turns pink in alkaline solutions.  

• The solution turns pink at the pH ranging between 8.2-10.  

• Phenolphthalein has two distinct compositions based on whether it is an acid (colorless) or alkali (pink) solution.  

Thus, turning of solution B to pink color by adding phenolphthalein indicator shows that the pH of the solution would be 10 based on the given options.  

To know more about:

https://brainly.com/question/16784630

Answer:No there needs to be fewer red on the reactant side.

Explanation:

Answer:

i think

Explanation:

"the reign of scar" will sound better

I like "Scar's Reign". If you really like "the Reign of Scar" I suggest finding a synonym to "reign" that fits nicer. Good luck with... whatever you're doing. Hope this helps :)

Answer:

1, 3, 2

Explanation:

1 x N2 = N2

3 x H2 = H6

2 x NH3 = N2H6

which is balanced, I believe.

Answer:

Typical metalloids have a metallic appearance, but they are brittle and only fair conductors of electricity. Chemically, they behave mostly as nonmetals. They can form alloys with metals. Most of their other physical properties and chemical properties are intermediate in nature.

Answer:

a)5.14 * 10^24 molecules H2O

Explanation:

8.54 moles of H2O contains 8.54 x 6.022 x 10^23 = 5.14 x 10^24 molecules of H2O.

I think you mean ionic bond and not conic bond. The pair of elements that form an ionic bond are barium and chlorine.

Answer: D) The sun

Explanation:

Explanation:

Hey there!

Basically, we name hydrocarbon in two ways. They are;

Hope it helps...