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Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{8.94 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 14.850498[/tex]

We have the final answer as

Hope this helps you

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass = 1892.6 g

volume = 200 mL

We have

[tex]density = \frac{1892.6}{200} \\ = 9.463[/tex]

We have the final answer as

Hope this helps you

Since we are starting from the number of atoms of Sulfur, we need to know two sets of formulas:

mass  = moles × molar mass

moles = atoms ÷ Avogadro's Number

         ⇒    mass = (atoms ÷ Avogadro's Number) ×  molar mass

 mass = [(100 atoms) ÷ (6.022 × 10²³ atoms/mole)] × (12.011 g/mol)    

           = 1.99 × 10⁻²¹ g

           ≈ 2e-21         [to 1 sig fig]

Answer:

113 because there are 113 elements

Explanation:

Answer:

Water separates the two reactants into two layers, stopping the reaction.

Explanation:

Maleic anhydride can and will react with water.

The reaction between maleic anhydride and anthracene is a Diels Alder reaction. This type of reaction is a cycloaddition reaction.

The Diels Alder reaction is a member of a class of reactions called cycloadditions. This reaction involves three pi bonds, two from the diene and one from the dienophile in a concerted reaction to give a six-membered ring.

Since this reaction involves four pi electrons in the diene and two pi electrons from the dienophile, it is sometimes referred to as a 4+2 cycloaddition.

The presence of electron donating groups on the diene and the electron withdrawing groups on the dienophile favors normal Diels Alder reactions. The reaction involves the formation of new σ bonds which are energetically more stable than π bonds.

Anthracene can react with water, breaking the center ring. Maleic anhydride can react with water, opening its ring. The reactants get seperated into two layers by water and thereby stops the reaction.

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Answer:

6 protons and 7 neutron

Explanation:

Carbon has a third isotopes named carbon-13

All carbon isotopes have 6 protons .

This is called atomic number. To make it up to 13 in carbon -13 you will need 7 neutrons and 6protons .

Answer:

english please I don't understand

Answer:

D. The ratio of the substances coefficients equals the ratio of their numbers of moles.

Explanation:

Molar mass of a compound is the sum of the molar mass of all the atoms of the compound.

⇒ Molar mass of the Nickel Compound (Hydrated Nickel (II) Nitrate)

             = Molar mass (Ni+ 2N + 6O)+ x (2H+ O)

             = [58.693 +  2(14.007) + 6(15.999)] + x [2(1.008) + 15.999] g/mol

             = (182.701 + 18.015x) g/mol

Since the molar mass is known to be  290.7 g/mol

then  182.701 + 18.015x = 290.7

⇒                       18.015x =  290.7 - 182.701

                                    x =  (290.7 - 182.701) ÷ 18.015

∴                                   x = 6    [conventionally expressed as a whole number]

            that makes the compound Nickel Nitrate Hexahydrate

The value of x in the hydrated compound of nickel nitrate with molecular mass 290.7 g/mol is 6.

Molecular mass can be defined as the sum of the mass of each element in the compound.

The molecular mass of the given compound is 290.7 g/mol. The value of x in the compound can be given as;

[tex]\rm 290.7\;g/mol=2(Ni)+2(N)+2(3O)+x(2H+O)[/tex]

Substituting the mass of N, Ni, O and H for the calculation of x as:

[tex]\rm 290.7\;g/mol=(58.693)+2(14.007)+2(3(15.999))+x(2(1.008)+15.999)\\290.7=182.701+18.015x\\x=6[/tex]

The value of x in the hydrated compound of nickel nitrate is 6.

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Answer:

Heat

Explanation:

Temperature is the average thermal energy (or heat) in a substance. Sound isn't really related, thermometers measure temperature, and chemical reactions can produce heat, but none of those are measured by temperature.

Answer:

D

Explanation:

Lamps

Answer:

forms when a neutron changes into a proton and a high-energy electron .

hope this helps <3

Answer:

p orbital

Explanation:

Answer: It will give up electrons, forming a positive ion.

During bonding, strontium atom will give up electrons, forming a positive ion.

STRONTIUM:

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Explanation:

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Answer:

a. Calcium: [Ar]4s^2

or 1s^2 2s^2 2p^6 3s^2 3p^6 (= Argon) 4s^2

b. Xenon

c. Zinc

d. Carbon

Explanation:

Group 2A = Alkaline Earth; period 4 shows that the element will be calcium.

To write the Electron Configuration we remember that Columns 1&2 and Helium represent the s-orbital which holds a maximum of 2 electrons. Columns 13 through 18 fill the p-orbital.

Answer:

3,526 meters (m) into kilometers (km) = 0.003526 kilometers

Explanation:

Answer:

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Explanation:

Answer:

2.75

Explanation:

D= [tex]\frac{mass}{volume}[/tex]

[tex]\frac{22}{8}[/tex]= 2.75

Hope this helps!

Answer:

Sorry I don't know.

Explanation:

I'm in 8th grade.

PbO  +  CO  →  Pb + CO₂

Oxidation States of the Elements

      Reactants     Products

Pb       +2                   0

O       -2, -2               -4

C         +2                 +4

Since the oxidation state/number of Pb decreased, it is being Reduced.

Since the oxidation state/number of C increased, it is being Oxidized.

Answer:

GUYS THIS RANDOM GIRL HANNAHJAXON DELETED ALL OF MY ANSWERS AND QUESTIONS ON MY ACCOUNT!!!

Explanation:

Answer:

AlAsO4

Explanation:

Aluminium arsenate is an inorganic compound with the formula AlAsO4. It is most commonly found as an octahydrate. It is a colourless solid that is produced by the reaction between sodium arsenate and a soluble aluminium salt.

Answer:

B) the rabies viru

Explanation:

The titration using permanganate in acidic solution because it can be act as behave indicator.

Titration is a typical quantitative chemical analysis procedure used in laboratories to quantify the concentration of a specified analyte. The titrant or titrator is a substance that is manufactured as a standard solution with a given concentration as well as volume.

Permanganate titrations must be performed in a strong acid solution. Because [tex]HNO_{3}[/tex] and HCl might involve in competing for a redox reaction, lowering the accuracy of the titration, sulfuric acid is commonly utilized. Titration permits food manufacturers to calculate the amount of a reactant present in a sample.

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Answer:

The mass number of an atom is equal to the number of protons plus the number of neutrons that it contains. In other words, the number of neutrons in an atom is its mass number minus its atomic number.

Explanation:

protons

The mass number of an atom is its total number of protons and neutrons. Atoms of different elements usually have different mass numbers , but they can be the same. For example, the mass number of argon atoms and calcium atoms can both be 40.

Answer:

No

Explanation:

When atomic number is increasing its atomic mass increases

Atomic number doesn't affect nuclear charge