The weighted average of the mass numbers of all the isotopes that occur in nature for particular element is the average atomic number true or false

Answer:

All the above

Explanation:

Answer:

Heat has shorter wavelengths than visible light.

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Answer:

Node

Explanation:

Other examples of nodes include servers, personal computers, hubs switches, modems, and etcetera. These devices must be connected together in a  network such as an Ethernet or WiFi. These nodes are given addresses depending on the communications layer they operate on the network.

Final answer:

A network device is anything that is connected to a network, such as a computer, printer, or gaming console. These devices communicate with each other and the wider world via various networks, with a prime example being a wireless WiFi router.

Explanation:

A network device is any device connected to a network such as a computer, printer, or game console. This refers to any device that can send, receive, or forward information across network segments. Examples of network devices include everything from the personal devices we use every day—like smartphones and laptops—to the high-tech servers that power large-scale internet operations.

Each of these devices, whether it's a state-of-the-art gaming console or a simple printer, is a key part of the wider network it's connected to. These networks enable communication between devices, facilitating the transfer of data and information. Part of what makes these smart technologies attractive is their ability to connect us to one another and to the wider world.

A wireless WiFi router is an example of a network device that uses microwaves to exchange data wirelessly with devices such as cell phones and computers. This signifies how interconnected our devices are, not just to each other, but also to the internet at large.

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Hello!

Dilute solution of oleic acid in pentane is used instead of pure oleic acid to form a monolayer when pentane evaporates. 

This substance is used in an experiment to determine the Avogrado Number. In this experiment, a dilute solution of oleic acid in pentane is placed over a known area of water. When pentane evaporates, a monolayer of oleic acid over water is formed and measuring the area of this monolayer will allow you to determine the Avogadro Number.

If pure oleic acid were used, the acid would mix with the water and the monolayer would not form.

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d. it isn't accelerating

i think it is D) because,

The forces on the wheelbarrow are balanced. Therefore, it cannot accelerate, but it doesn't have to be still.

HOPE THIS HELPS

(T_T)

Converting from mass (grams) to moles: Divide your initial mass by the molar mass of the compound as determined by the periodic table.Converting from moles to mass (grams): Multiply your initial mole value by the molar mass of the compound as determined by the periodic table.Converting from volume (liters) to moles: Divide your initial volume by the molar volume constant, 22.4 L.Converting from moles to volume (liters): Multiply your mole value by the molar volume constant, 22.4L.Converting from particles (atoms, molecules, or formula units) to moles: Divide your particle value by Avogadro’s number, 6.02×1023. Remember to use parentheses on your calculator!Converting from moles to particles (atoms, molecules, or formula units): Multiply your mole value by Avogadro’s number, 6.02×1023.Mole-to-mole conversions: Use the coefficients from your balanced equation to determine your conversion factor. Be sure your units cancel out so you end up with the correct mole value.

The answer is 111g of calcium chloride

Answer: 111 g

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to the molecular mass and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.

To calculate the moles, we use the equation:

[tex]\text{Number of moles of calcium}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{40g}{40g/mol}=1mole[/tex]

[tex]\text{Number of moles of chlorine}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{71g}{71g/mol}=1mole[/tex]

[tex]Ca+Cl_2\rightarrow CaCl_2[/tex]

1 moles of calcium react with 1 mole of chlorine to give 1 mole of calcium chloride.

Mass of calcium chloride =[tex]moles\times {\text {molar mass}}=1mol\times 111g/mol=111g[/tex]

Thus 111 g of calcium chloride is produced.

Answer : Option B) Air

Explanation : As the speed of light depends on the refractive index of the medium; then according to Snell's law (refer the attachment) Air is the medium that would have the longest wavelength amongst the given options.

As the refractive indexes of water is 1.33, glass is 1.5 and diamond 2.42 are much higher than air. Therefore, it will be the medium which will allow maximum light to pass through it easily and hence, will be the medium with longest wavelength.

The correct answer is air.  

The refractive indexes of air, water, glass and diamond are1.0003, 1.33, 1.5 and 2.42 respectively. The refractive index of air is the lowest so it is the medium through which light will travel faster with the longest wavelength. The higher the refractive index the denser the medium and the slower is the speed with which light will travel through this medium.  

Answer;

A teacher takes the cap off a permanent marker. A few minutes later, students at the back of the classroom complain about the odor of the marker.A cooking school student burns a piece of toast. Soon, the entire kitchen smells like burnt toast.Toxic fumes produced by a chemical factory are detected in the air in a town several miles away.Explanation;Diffusion is a type of passive transport that involves the movement of particles from a region of high concentration to a region of low concentration. Diffusion takes place in liquids and gases, since their particles can move randomly from one region to another.Therefore, diffusion results from the random movement of particles in which the net movement is down the concentration gradient  that is, from a region of high concentration to a region of low concentration.

soda  ash   which  is  also referred  to  as   sodium  carbonate with  a  chemical  formula (NaCO3)  has  the   following   chemical   formula
The   melting   point   of  851  degrees
The  molecular  weight  of  105.98
Its  density  at   25  degrees  is =2.53 g/cm^3
Its  specific  heat  capacity  at  25  degrees = 0.249  cal/gm/ 0c

by  use  of  combined  gas  law
 P2=  T2P1V1/V2
v1=5L
P1=540  torr
T1=25+273=298k
V2=15 L
T2=32+273=305  k

P2  is   therefore=(  305k  x  540 torr  x5 L) /( 15L  x  298)=  184.23  torr

The  percentage  by mass  of  oxygen  in  the  compound

find  the total  mass=(  1.900+  0250 +0.850) =  3
the  percentage  mass  mass of  oxgyen/total  mass  x100

that  is  (0.850/3)  x100=28.33%

 the answer is "in cold water"

From the equation for molarity (number of moles of a substance dissolved in one liter of solution), we can get an equation for determining the number of moles:

c=n/V   ⇒   n=c×V

Now, we can write required equations:

A   n(NaOH)=c(NaOH)×V(NaOH)

B    n(H₂SO₄)=c(H₂SO₄)×V(H₂SO₄) 

From the reaction, we can conclude that NaOH and H₂SO₄ have following stoichiometric ratio:

2NaOH + H₂SO₄ ⇒ Na₂SO₄ + 2H₂0

n(NaOH) : n(H₂SO₄) = 2 : 1

So, we can write:

n(NaOH) = 2 × n(H₂SO₄)

And if we connect the above equations, we get the equation for solving c(H2SO4):

c(NaOH)×V(NaOH) = 2×c(H₂SO₄)×V(H₂SO₄)

c(H₂SO₄) = (c(NaOH)×V(NaOH)) / (2×V(H₂SO₄))

The concentration of [H2SO4] is obtained from; [NaOH] × VNaOH/ 2× VH2SO4

The equation of the reaction is;

2NaOH(aq) + H2SO4(aq) ------>  Na2SO4(aq) + 2H2O(l)

Number of moles of H2SO4(nH2SO4) = [H2SO4] × VH2SO4

Number of moles of NaOH(nNaOH) = [NaOH] × VNaOH

Where;

[H2SO4] = concentration of H2SO4

VH2SO4 = volume of H2SO4

[NaOH]  = concentration of NaOH

VNaOH = volume of NaOH

From the balanced reaction equation;

2 moles of NaOH reacts with 1 mole of H2SO4

2nH2SO4 = nNaOH

2[H2SO4] × VH2SO4 =  [NaOH] × VNaOH

[H2SO4] =   [NaOH] × VNaOH/ 2× VH2SO4

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Answer: metals are found on the left side of the periodic table

Justification:

A. All elements in period 2 are metals: FALSE.

The period 2 include metals and no metals: Li and Be are metals, while B is a metaloid, and C, N, O, and F are non-metals

B. All elements in group 18 are metals: FALSE.

The elements in group 18 are known as noble gases: He, Ne, Ar, Kr, Xe, Rn, and Og (recently named). All of them are non-metals.


C. Metals are found on the left side of the periodic table. TRUE.

With exception of H.

Alkalyne metals are the group 1 (Li, Na, K, Rb, Cs, and Fr).

Alkalyne-earth metals are the group 2: Be, Mg, Ca, Sr, Ba, and Ra.

Those two are the groups most to the left.

The non-metals are all on the right side of the periodic table.

D. Metals are found on the right side of the periodic table. FALSE.

According to the previous information.

Final answer:

The true statement about the periodic table is that metals are found on the left side of the periodic table, and nonmetals are located on the upper right, with a diagonal band of semimetals separating them.

Explanation:

The correct answer to the question "Which sentence about the periodic table of elements is true?" is that metals are found on the left side of the periodic table. This is because the elements can be categorized generally into metals, nonmetals, and semimetals, and it is known that metals occupy the left side of the periodic table. Nonmetals are found primarily on the upper right side, and they are divided from metals by a diagonal band of semimetals. Specifically, Group 1 contains the alkali metals, and Group 2 houses the alkaline earth metals, while Group 17 has the halogens and Group 18 has the noble gases, which are nonmetals.

hello
the answer is c
have a nice day

The appropriate answer is B. decreasing the surface area. A solute is a component that dissolves in a solvent to form a solution. Increasing the surface area means making more of the surface of the solid available to be dissolved.
For example, it would be difficult to dissolve a a Lego sized cube of sugar in a liter of water. Crushing the same cube into smaller fragments increases the surface area and would speed up the rate of dissolution.

An incandescent bulb becomes hotter than a fluorescent bulb when turned on because in a regular incandescent bulb, there is tungsten wire where electricity is converts into heat. A regular incandescent light bulb requires 4 times more energy than a fluorescent bulb in order to produce the same amount of light. The conversion is such that for a 75-watt bulb, temperature get raised to approximately 2000 K. For such a high temperature, the radiating energy from the wire have some visible light. In such bulbs, 90% of the electricity get consumed in producing heat and only 10% produces light thus, they are not much efficient source of light.

On the other hand, fluorescent bulbs produce light with less amount of heat. In them, 40% of electricity is consumed in producing light and 60% in heat which is very less as compared to heat produced by a incandescent bulb. This is because when it get turned on, mercury atoms inside the bulb collides with electrons and produce UV light  which is then converted into visible light using thin layer of phosphor power present inside the bulb. This produces low amount of heat thus, the bulb stays cooler, the bigger size of bulb also helps in dispersing heat.

Therefore, a fluorescent light bulb is not as hot as an incandescent light bulb.

Particles in plasmas collide more often, but that does not necessarily give them higher temperature.

Plasma particles have high kinetic energy (they move quickly).

Plasma particles are far apart.

The plasma in a fluorescent bulb has a low density.

Mgs is the compound that has the greatest percent composition by mass of sulfur.

Hey there!

Your answer is option A.

"Molecules of the dispersion medium colliding with dispersed phase particles" is what causes Brownian motion in colloids.

Hope this helps you.
Have a great day!

Answer:

The correct answer is option A.

Explanation:

Brownian motion is a random motion of particles present in the fluid such as air or liquid.This motion of the particles  is due to collision with fast moving molecules in a fluid.

In colloids , molecules of dispersed phase are in motion due to the fast motion of dispersion medium's particle which imparts motion to these particles of dispersed phase by means of collision.

Answer: [tex]3.13\times 10^{23}molecules[/tex]

Explanation: To calculate the moles, we use the formula:

[tex]Moles=\frac{\text{Given mass}}{\text{Molar mass}}=\frac{9.34g}{18g/mol}=0.52mol[/tex]  

1 mole of water contains=[tex]6.023\times 10^{23}molecules[/tex] of water

0.52 moles of water contain=[tex]\frac{6.023\times 10^{23}}{1}\times 0.52=3.13\times 10^{23}molecules[/tex] of water

One or more than one atoms bonds and makes up the molecules, it can be the same or different atoms that make up the compounds. Molecules present in the 9.34 gm of water are [tex]\rm 3.13 \times 10^{23}[/tex].

What is the formula for calculating molecules?

Given,

Mass of the water (m) = 9.34 gm

The molar mass of the water (M)= 18 g/mol

From the mass and the molar mass number of the moles can be estimated:

[tex]\rm Moles (n) = \dfrac{\;\rm Mass}{\rm Molar \;mass}[/tex]

Substituting values in the above formula:

[tex]\begin{aligned}\rm n &= \dfrac{9.34\;\rm g}{18\;\rm g/mol}\\\\&= 0.52\;\rm mol\end{aligned}[/tex]

We know that,

1 mole of water = [tex]\rm 6.023 \times 10^{23}[/tex] molecules of water

0.52 moles of water = X molecules

Solving for X:

[tex]\begin{aligned} \rm X &= 0.52 \times \rm 6.023 \times 10^{23}\\\\&= \rm 3.13 \times 10^{23}\end{aligned}[/tex]

Therefore, [tex]\rm 3.13 \times 10^{23}[/tex] molecules are present.

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Ans-A
In CaF2, the oxidation number of Ca is +2,& that of F is -1.

Ans-B
In H2SO4, the oxidation number of H is +1, that of S is +6,& that of O is -2.

Ans-C
In CaSO4, the oxidation number of Ca is +2, that of S is +6,& that of O is -2.

Ans-D
In HF, the oxidation number of H is +1,& that of F is -1.

Explanation:
Oxidation number is a number that is assigned to an element in a compound, which shows the number of electrons gained or lost by an atom.

Rules:
1. If the element is ALONE in the chemical equation, and it is NOT an ION, its oxidation number will ALWAYS be zero.

2. When there is an ION in the equation, its oxidation number will ALWAYS be its ionic number.

A(2 parts):
The oxidation number of Ca & F?

In what group Ca lies? Well in group 2 in the periodic table.
Is it alone? No, it is not. It's with Florine F.
Is it multiple of itself? No.

The second element is Florine(F).
In what group F lies? Well in group 17(in halogens) in the periodic table.
Is it multiple of itself? Yes. There are 2 Florine atoms.

Is there any net charge on the compound? No.

Blank 2: The oxidation number of F2 = 2 * (-1) = -2. Since the oxidation number of the single atom F is -1 for the halogens(group-17 members). In this compound there are 2 Florine atoms, therefore it should be -2. Although the F2 has the oxidation number of -2, the single atom of F has the oxidation number -1.

Blank 1: The oxidation number of Calcium= +2. Since the oxidation number of the single atom Ca is +2 for the group-2 members. Also, we can recheck it by using the Rule-2, mentioned above, but for compound. As I mentioned before, the net charge on the CaF2 is zero; therefore, the sum of the oxidation number of Ca and that of F2 has to be zero. Since the oxidation number of F2 is -2, the oxidation number of Ca has to be +2 to make the net charge equals to zero. Therefore, the oxidation number of Ca is +2.

B(3 parts):
The oxidation number of H, S & O?

In what group Hydrogen(H) lies? Well in group 1 in the periodic table.
Is it alone? No, it is not. It's with Sulfur(S) and Oxygen(O) .
Is it multiple of itself? Yes. It's H2; therefore, there are two hydrogen atoms.

The second element is Sulfur(S).
In what group S lies? Well in group 16(in chalcogens) in the periodic table.
Is it multiple of itself? No.

The third element is Oxygen(O).
In what group Oxygen(O) lies? Well in group-16 in the periodic table.
Is it alone? No, it is not. It's with Sulfur(S) and Hydrogen(H) .
Is it multiple of itself? Yes. It's O4; therefore, there are four oxygen atoms.

Is there any net charge on the compound? No.

Blank 3: The oxidation number of O4 = 4 * (-2) = -8. Since the oxidation number of the single atom O is -2 for the chalcogens (group-16 members). In this compound there are 4 Oxygen atoms, therefore it should be -8. Although the O4 has the oxidation number of -8, the single atom of O has the oxidation number -2.

Blank 1: The oxidation number of H2 = 2 * (+1) = +2. Since the oxidation number of the single atom H is +1 for the group-1 members. In this compound there are 2 hydrogen atoms, therefore it should be +2. Although the H2 has the oxidation number of +2, the single atom of H has the oxidation number +1.

Blank 2: As I mentioned before, the net charge on the H2SO4 is zero; therefore, the sum of the oxidation number of H2, S and that of O4 has to be zero. Since the oxidation number of H2 is +2, and the oxidation number of O4 is -8, the oxidation number of Sulfur has to be +6 to make the net charge equals to zero. Therefore, the oxidation number of S is +6.

C(3 parts):

Blank 3: The oxidation number of O4 = 4 * (-2) = -8. Since the oxidation number of the single atom O is -2 for the chalcogens (group-16 members). In this compound there are 4 Oxygen atoms, therefore it should be -8. Although the O4 has the oxidation number of -8, the single atom of O has the oxidation number -2.

Blank 1: The oxidation number of Calcium= +2. Since the oxidation number of the single atom Ca is +2 for the group-2 members. Although Sulfur in the compound is also a single element, but as Calcium comes first, therefore, we would consider Ca as an independent element. Hence, Ca has the oxidation number +2.

Blank 2: As I mentioned before, the net charge on the CaSO4 is zero; therefore, the sum of the oxidation number of Ca, S and that of O4 has to be zero. Since the oxidation number of Ca is +2, and the oxidation number of O4 is -8, the oxidation number of Sulfur has to be +6 to make the net charge equals to zero. Therefore, the oxidation number of S is +6.

D(2 parts):

Blank 2: The oxidation number of F =  -1. Since the oxidation number of the single atom F is -1 for the halogens(group-17 members).

Blank 1: The oxidation number of Hydrogen H = +1. As I mentioned before, the net charge on the HF is zero; therefore, the sum of the oxidation number of H and that of F has to be zero. Since the oxidation number of F is -1, the oxidation number of H has to be +1 to make the net charge equals to zero. Therefore, the oxidation number of H is +1.

The oxidation number is defined as the total number of electrons gained or lost in a chemical bond with another atom.

The oxidation number of the given elements are:

Ca is +2 and F is -1. H is +1, S is +6, and O is -2.Ca is +2, S is +6, and O is -2.H is +1, and F is -1.

1. CaF₂ or calcium fluoride is an ionic bond. The oxidation number of Calcium is +2 and that of Flourine is -1. The net charge on the compound is zero.

2. Sulfuric acid is a type of covalent bond. The oxidation number of Hydrogen is +1, Sulfur is +6, and that of Oxygen is -2. The net charge on the compound is zero.

3. Calcium sulfate is a type of covalent bond and ionic bond. The oxidation number of Calcium is +2, Sulfur is +6, and that of Oxygen is -8. The net charge on the compound is zero.

4. Hydrogen Flouride is a type of covalent bond. The oxidation number of Hydrogen is +1 and that of Flourine is -1. The net charge on the compound is zero.

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The empirical formula of the compound is LiBr.

To determine the empirical formula of the compound, we need to find the ratio of the number of moles of each element in the compound.

First, let's find the number of moles for each element:

Lithium (Li):

Mass of lithium (given) = 16 g

Relative atomic mass of lithium (from the periodic table) = 7

Number of moles of lithium = Mass / Relative atomic mass = 16 g / 7 g/mol ≈ 2.29 moles

Bromine (Br):

Mass of bromine (given) = 183 g

Relative atomic mass of bromine (from the periodic table) = 80

Number of moles of bromine = Mass / Relative atomic mass = 183 g / 80 g/mol ≈ 2.29 moles

Now, we need to find the simplest whole-number ratio of moles of lithium to moles of bromine. Both elements have approximately 2.29 moles. To find the ratio, we can divide both moles by the smallest number of moles:

Number of moles of Li = 2.29 moles / 2.29 moles = 1

Number of moles of Br = 2.29 moles / 2.29 moles = 1

The empirical formula of the compound is LiBr, indicating that there is one lithium atom for every one bromine atom in the compound.

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Final answer:

To find the empirical formula of a compound containing lithium and bromine, calculate the moles of each element based on their given masses and the relative atomic masses, then express the mole ratio in simplest whole number terms to obtain the empirical formula.

Explanation:

The empirical formula of a compound can be found by dividing the mass of each element by its atomic mass to find the number of moles of each element and then expressing those values in the simplest whole number ratio. To determine the empirical formula for the compound containing lithium and bromine, we do the following steps:

Calculate the number of moles of lithium: moles of Li = 16 g / 7 g/mol.Calculate the number of moles of bromine: moles of Br = 183 g / 80 g/mol.Determine the simplest ratio by dividing both values by the smallest number of moles calculated in the previous steps.

Once we have the simplest whole number ratio of the moles of lithium to moles of bromine, that ratio will be used to write the empirical formula.

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Hello! Those are called the isotopes of those elements!! They have more than just one form and each has it’s own AMU’s so the multiple numbers above different elements, represent the isotopes of those elements. Carbon is a good one just for one example.

Hope this helps you out! Questions please just ask! Thanks!

i'm pretty sure a physical change because it's affecting the form of the chemical substance, but not its chemical composition

Answer:

c: object 3

Explanation:

c: object 3

Explanation:

Answer is: - delta G.
The change in Gibbs free energy (ΔG), at constant temperature and pressure, is: ΔG=ΔH−TΔS.
ΔH is the change in enthalpy.
ΔS is change in entropy.
T is temperature of the system.
When ΔG is negative, a reaction (occurs without the addition of external energy) will be spontaneous (exergonic).

Final answer:

The correct answer is "- delta G". For a spontaneous reaction, delta G must always be negative. This indicates that the reaction releases free energy and can proceed without external intervention.

Explanation:

The correct answer for which change will always be true for a spontaneous reaction is - delta G. This is because a spontaneous reaction is defined as one that proceeds on its own without any external influence, and for such a reaction, the change in Gibbs free energy, represented as delta G, must always be negative. This negative delta G indicates that the process is releasing free energy. The Gibbs free energy equation delta G = delta H - T delta S tells us that the spontaneity of a reaction depends on both the enthalpy change (delta H) and the entropy change (delta S) along with the absolute temperature in Kelvin (T). If the enthalpy change is negative (- delta H) and the entropy change is positive (+ delta S), delta G will always be negative, indicating a spontaneous reaction at all temperatures. However, if delta H is positive and delta S is negative, the reaction will never be spontaneous as delta G will be positive.

Answer: The equilibrium will shift to the left to favor the reverse reaction.

Explanation:

This is a direct application of Le Chatelier's principle.

Le Chatelier's principle states: if it is introduced a change that distrubs a system in equilibrium, the system will displace toward the direction that release the disturbance.

The increase in the concentration of CO (which is in the right side of the equation) takes the system out of the equilibrium. The greater number of molecules of CO means that more CO will react to favor the reverse reaction and restore the equilibrium with the increase of molecules in the left side.

Hydrogen fusion is the answer. It is also known as hydrogen burning. 

  question   1
moles  =  mass/molar  mass  of  Al(OH)3
convert   Kg  to  g
that  is  1.09  x  1000=1090g

moles  is  therefore=1090g/78(molar  mass  of Al(OH)3)=  13.974 moles

   question  2
moles=2.55g/327.2(molar   mass  of  Pb(CO3)2=  7.79  x   10^-3   moles
from  avogadro  constant
1moles=6.02  x10^23  formula  units
what  about  7.79  x  10  ^-3
={(7.79  x  10^-3)moles  x ( 6.02  x10^23)} /1  mole=4.69  x10^21  formula  units

Answer is: there are 5,275·10²³ hydrogen atoms in methane.
m(CH₄) = 3,50 g.
n(CH₄) = m(CH₄) ÷ M(CH₄).
n(CH₄) = 3,5 g ÷ 16 g/mol.
n(CH₄) = 0,219 mol.
n(CH₄) : n(H) = 1 : 4.
n(H) = 4 · 0,219 mol = 0,876 mol.
N(H) = n(H) · Na.
N(H) = 0,876 mol · 6,022·10²³ 1/mol.
N(H) = 5,275·10²³.
Na - Avogadro number.

There are two such ions in every molecule
1 mol contains 6.02 * 10^23 things.
1 mol of (NH4)2S  contains 2*6.02 * 10^23 ions (of NH4+ in this case.) = 1.204 * 10^24 ions HN4+

5 mol of (NH4)2S contains 5 * 1.204*10^24 =
6.02 * 10^24 mols NH4+ions <<<<====Answer

Answer: The number of ammonium ions in given moles of ammonium sulfide are [tex]6.022\times 10^{24}[/tex]  

Explanation:

We are given:

A chemical compound having chemical formula of [tex](NH_4)_2S[/tex]

In 1 mole of ammonium sulfide, 2 moles of ammonium ions and 1 mole of sulfide ions are present.

According to mole concept:  

1 mole of compound contains [tex]6.022\times 10^{23}[/tex] number of atoms

So, 5 moles of ammonium sulfide molecule will contain = [tex]5\times 2\times 6.022\times 10^{23}=6.022\times 10^{24}[/tex] number of ammonium ions.

Hence, the number of ammonium ions in given moles of ammonium sulfide are [tex]6.022\times 10^{24}[/tex]