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Answer: There are [tex]40.41 \times 10^{23}[/tex] molecules present in 6.71 moles of [tex]NH_{3}[/tex].

Explanation:

Given: Moles of [tex]NH_{3}[/tex] = 6.71 mol

According to the mole concept, 1 mole of every substance contains [tex]6.022 \times 10^{22}[/tex] molecules.

Therefore, molecules present in 6.71 moles are calculated as follows.

[tex]Molecules = moles \times 6.022 \times 10^{23}\\= 6.71 \times 6.022 \times 10^{23}\\= 40.41 \times 10^{23}[/tex]

Thus, we can conclude that there are [tex]40.41 \times 10^{23}[/tex] molecules present in 6.71 moles of [tex]NH_{3}[/tex].

Answer:

1.49kJ

Explanation:

Using the formula as follows;

Q = m × c × ∆T

Where;

Q = amount of heat (joules)

m = mass (g)

c = specific heat of silver (J/g°C)

∆T = change in temperature (°C)

According to the information given in this question;

mass of Silver (Ag) = 236g

c of Ag = 0.24 J/g°C

initial temperature (T1) = 8.5°C

final temperature (T2) = 34.9°C

∆T = T2 - T1 = 34.9 - 8.5 = 26.4°C

Using Q = m × c × ∆T

Q = 236 × 0.24 × 26.4

Q = 1,495.3 Joules

Amount of heat needed to raise the temperature of Silver (Q) in kilojoules is 1495.3/1000 = 1.4953

Q = 1.49kJ

Answer:

Probably around 6 because the ph of hydrochloric acid is 3

Explanation:

Answer: The reactivity of group 1 elements increases as you go down the group because: the atoms become larger. the outer electron becomes further from the nucleus. the force of attraction between the nucleus and the outer electron decreases.

Answer:

612.2kJ are produced

Explanation:

Based on the reaction:

2P + 5Cl₂ → 2PCl₃  + 886.0kJ

When 2 moles of P react with an excess of chlorine 886.0kJ are produced (That is 886.0kJ / 2mol P).

To solve this question we must use the last statement as follows:

1.382mol P * (886.0kJ / 2mol P) =

Answer:

Arrow B

Explanation:

Answer:

im not a brain wiz but i think 20

Explanation:

Answer: 0.03798 kilograms

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP 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}=\frac{\text{Given volume}}{\text {Molar Volume}}=\frac{12L}{22.4L}=0.535moles[/tex]

1 mole of chlorine gas [tex](Cl_2)[/tex] weighs = 71 g

Thus 0.535 moles of chlorine gas [tex](Cl_2)[/tex] will weigh = [tex]\frac{71}{1}\times 0.535=37.98g=0.03798kg[/tex]            (1kg=1000g)

Thus there are 0.03798 kilograms in 12 L of chlorine gas.

Answer:

0.28M H2SO4

Explanation:

The molarity of a solution is defined as the ratio between the moles of the solute (In this case, H2SO4) and its volume in liters.

In the problem, the volume of the solution is increased from 125mL to 250mL. That means the solution is diluted:

250mL / 125mL = 2 times.

As the solution is diluted 2 times, the concentration is decreased in 2, that is:

0.56M / 2 =

Answer:

im not sure

Explanation:

Answer:

cell :—

•They lack a well-defined nucleus, have a nucleoid instead.

•Usually have double-stranded, circular DNA.

•Do not have mitochondria.

Eukaryotic cell :—

•Have a well-defined nucleus enclosed in the nuclear membrane.

•Have a linear double-stranded nucleus.

•Mitochondria are present.

Answer:

The answer is below

Explanation:

Certain countries like Germany under Adolf Hitler favored military solutions to the great depression because the government felt that having a mass production of military weapons and recruitment of unemployed people or citizens into the army would change the dire situation.

On the other hand, countries like the United States did not favor the military solutions but instead choose the NEW DEAL under Franklin D Roosevelt; the reason could be linked to their democratic culture, the isolation belief tendency.

Answer:

1.204 × 10^24 formula units

Explanation:

Using the following formula to convert mass of iron (III) chloride to moles;

mole = mass/molar mass

Molar mass of FeCl3 = 56 + 35.5(3)

= 56 + 106.5

= 162.5g/mol

Mole = 325/162.5

mole = 2mol

Next, to calculate the formula units of FeCl3, we multiply the number of moles of FeCl3 by Avagadro number (6.02 × 10^23)

Formula units of FeCl3 = 2 × 6.02 × 10^23

12.04 × 10^23

= 1.204 × 10^24 formula units.

gene therapy

Explanation:

Gene therapy, also called gene transfer therapy, the introduction of a normal gene into an individual's order to repair a mutation that causes a genetic disease.

Answer:

C artificial selection

Explanation:

Brainly please

Answer:

.biology and maybe physics

Answer:

Biologist

ExplanationBiologist Unlike the above type of scientist, geoscientists’ work involves exploring the earth and its internal environment. They study the composition, structure, and processes of the earth by being indoors and outdoors. They contribute to the discovery of mines, petroleum deposits, minerals, and other aspects of the earth.

Answer:

0.502mol

Explanation:

The balanced chemical equation of the reaction described in this question is as follows:

2KClO3 → 2KCl+ 3O2

According to the equation above, 2 moles of KClO3 will produce 2 moles of KCl.

Using mole = mass/molar mass to convert mass of KClO3 to moles

Molar mass of KClO3 = 39 + 35.5 + 16(3)

= 39 + 35.5 + 48

= 122.5g/mol

mole = 61.5 g ÷ 122.5g/mol

mole = 0.502mol

Since 2 moles of KClO3 will decompose to produce 2 moles of KCl.

0.502 mol of KClO3 will decompose to produce 0.502 × 2/2

= 0.502mol of KCl.

Answer:

true

Explanation:

Answer:

electricity

Explanation:

A circuit is used in every electrical and electronics operation.

Answer:

a

Explanation:

me say so

Answer:

C

Explanation:

Answer:

The answer is gamma rays.

Explanation:

Gamma rays have the highest energies, the shortest wavelengths, and the highest frequencies on the electromagnetic spectrum.

Answer:

n=4

Explanation:

n= (154.75×28.40)÷(68.45×18)

n=3.5

n=4(approximately)

Answer:please see explanation for answers

Explanation:

Water conservation is an approach geared towards controlling how water is used. Because of the ever growing population, which weighs so much on water available to mankind,Over negligence and abuse of our water resources have been a great point of concern, that is why the need for the knowledge of water conservation is preached.

Now, some of the ways we can conserve water include

1. Putting off taps while lathering the hands with soap

2.use of irrigation system to water crops and plants

3.. while brushing, make sure to turn off the tap or faucet

4. use a shower rather than a bath

Answer:

[tex]2Zn+PbCl_4\rightarrow 2ZnCl_2+Pb[/tex]

Explanation:

Hello there!

In this case, when referring to single replacement reactions, it is crucial for us to figure out the formula of the starting reactants; thus, we know zinc is Zn and lead (IV) chloride is PbCl₄. In such a way, the reaction proceeds as follows:

[tex]Zn+PbCl_4\rightarrow ZnCl_2+Pb[/tex]

Which must be balanced as shown below:

[tex]2Zn+PbCl_4\rightarrow 2ZnCl_2+Pb[/tex]

Regards!

Answer:

Do Nothing

Explanation:

Charges are transferred by friction when two different types of bodies are rubbed together. This is known as charging by friction.

However, when two materials of the same type are rubbed together, no charge is transferred from one object to the other hence there is no transfer of charges by friction and none of the two glass rods are charged.

Therefore, when one of the glass rods is brought close but does not touch the pith ball, nothing happens.

Answer:

Concrete

Explanation:

Answer:

wdym??

Explanation:

Answer:

wdym by water, soil, temperature, space?