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Answer:

A

Explanation:

Answer:

30 mph

Explanation:

Answer:

The mass of 8.50 × 10²² NH₃ molecules is ≈ 1.84 g.

One mole of a molecule contains 6.02 × 10²³ molecules. The mass of  8.50 × 10²² molecules of NH₃ is 2.39 g.

Ammonia is an inorganic compound formed by hydrogen and nitrogen. Ammonia exists in gaseous state.

One mole of every element or compound contains 6.02 × 10²³ molecules. This number is called Avogadro number. The molar mass of ammonia is 17 g/l

It is given that the number of molecules of ammonia here, is 8.50 × 10²².

The no.of moles of ammonia = 8.50 × 10²²/ 6.02 × 10²³

                                                = 0.141 moles.

If one mole ammonia is 17 g/l, the mass of 0.141 moles of NH₃ is calculated as follows: 0.141 × 17 = 2.39 g. Hence the mass of NH3 which contains 8.50 × 10²² molecules is 2.39 g.

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Answer:

15. 2.5 M

16. 2.5 moles

17. 0.128 M

18. 56 g

Explanation:

15. Determination of the molarity of NaOH.

Mole of NaOH = 2.5 moles

Volume = 1 L

Molarity =?

Molarity = mole /Volume

Molarity of NaOH = 2.5 / 1

Molarity of NaOH = 2.5 M

16. Determination of the number of mole of solute.

Volume = 1 L

Molarity = 2.5 M

Mole of HCl =?

Molarity = mole /Volume

2.5 = mole of HCl /1

Mole of HCl = 2.5 moles.

17. Determination of the molarity of Na₂S

We'll begin by calculating the number of mole in 20 g of Na₂S. This can be obtained as follow:

Mass of Na₂S = 20 g

Molar mass of Na₂S = (23×2) + 32

= 46 + 32

= 78 g/mol

Mole of Na₂S =?

Molar = mass / molar mass

Mole of Na₂S = 20 / 78

Mole of Na₂S = 0.256 mole

Finally, we shall determine the molarity of Na₂S. This can be obtained as follow:

Mole of Na₂S = 0.256 mole

Volume = 2 L

Molarity of Na₂S =?

Molarity = mole /Volume

Molarity of Na₂S = 0.256 / 2

Molarity of Na₂S = 0.128 M

18. Determination of the mass of solute.

We'll begin by calculating the number of mole solute (CH₄) in the solution. This can be obtained as follow:

Volume = 1 L

Molarity of CH₄ = 3.5 M

Mole of CH₄ =?

Molarity = mole / Volume

3.5 = mole of CH₄ / 1

Mole of CH₄ = 3.5 moles

Finally, we shall determine the mass of the solute (CH₄). This can be obtained as follow:

Mole of CH₄ = 3.5 moles

Molar mass of CH₄ = 12 + (4×1)

= 12 + 4

= 16 g/mol

Mass of CH₄ =?

Mole = mass /Molar mass

3.5 = Mass of CH₄ / 16

Cross multiply

Mass of CH₄ = 3.5 × 16

Mass of CH₄ = 56 g

Answer:

yeah why?

Explanation:

Explanation:

Metals usually have stronger electron affinity than non-metals:

In the periodic table, the trend of electron affinity is that it increases from left to right across the period and decrease down the group.

False

Noble gas elements have a very large value for electron affinity:

Electron affinity is the change in energy of an atom when an electron is added. Noble gases already have a complete octet configuration hence there is no reason to accept any electrons. This makes their electron affinity value less than or equal to zero.

False

Negative anions have a larger ionic radius than the atomic radius of their neutral atom:

Neutral atoms that gain electron are referred to as anions. The extra electron increases the electron-electron repulsion which pushes the electrons further apart and finally increased radius.

True

Answer:

hello your question is incomplete attached below is the complete question

answer :

Fe2O3 = 159 g/mol

CO = 28.01 g/mol

Fe = 55.85 g/mol

CO2 = 44.01 g/mol

Explanation:

       Fe = 55.85 g/mol

       O = 16.0 g/mol

       hence the molar mass of Fe2O3 = 2(55.85) + 3(16) = 159 g/mol

        C = 12.01 g/mol

        O = 16.0 g/mol

        hence the molar mass of CO = 28.01 g/mol

        Fe = 55.85 g/mol

        C = 12.01 g/mol

        O = 16.0 g/mol

        hence the molar mass of CO2 = 12.01 + 2(16) = 44.01 g/mol

Answer:

There ya go ;)

Explanation:

Answer:

[tex]\% NaHCO_3=68.6\%[/tex]

Explanation:

Hello!

In this case, since a symbolic representation of the undergoing chemical reaction is:

[tex]NaHCO_3 + HA \rightarrow NaA + CO_2 + H_2O[/tex]

In such a way, since there is 1:1 mole ratio between the sodium bicarbonate (84.01 g/mol) and carbon dioxide (44.01 g/mol) we compute the mass of reactant that was used during the reaction via stoichiometry:

[tex]m_{NaHCO_3}=0.561gCO_2*\frac{1molCO_2}{44.01gCO_2}*\frac{1molNaHCO_3}{1molCO_2}*\frac{84.01gNaHCO_3}{1molNaHCO_3}\\\\m_{NaHCO_3}=1.07gNaHCO_3[/tex]

Thus, the by-mass percent of pure sodium bicarbonate in the 1.56-g sample is:

[tex]\% NaHCO_3=\frac{1.07g}{1.56g}*100\%\\\\ \% NaHCO_3=68.6\%[/tex]

Best regards!

The percent by mass of NaHCO₃ in the original mixture is 68.65%

We'll begin by calculating the mass of NaHCO₃ that reacted and the mass of CO₂ produced from the balanced equation.

NaHCO₃ + HA —> NaA + CO₂ + H₂O

Molar mass of NaHCO₃ = 23 + 1 + 12 + (16×3) = 84 g

Mass of NaHCO₃ from the balanced equation = 1 × 84 = 84 g

Molar mass of CO₂ = 12 + (16×2) = 44 g/mol

Mass of CO₂ from the balanced equation = 1 × 44 = 44 g

From the balanced equation above,

84 g of NaHCO₃ reacted to produce 44 g of CO₂

From the balanced equation above,

84 g of NaHCO₃ reacted to produce 44 g of CO₂

Therefore,

X g of NaHCO₃ will react to produce 0.561 g of CO₂ i.e

[tex]X \: g \: of \: NaHCO_3 = \frac{84 \times 0.561}{44} \\ \\ X \: g \: of \: NaHCO_3 = 1.071 \: g[/tex]

Mass of NaHCO₃ = 1.071 g

Mass of mixture = 1.56 g

[tex]Percentage \: = \frac{mass}{total \: mas} \times 100 \\ \\ = \frac{1.071}{1.56} \times 100 \\ \\ [/tex]

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Answer:

Explanation:

D = m/v

D = 2000/80 = 25

Acids are sour in taste while Bases are bitter in taste . This is due to the pH that indicates acidity or basicity , and is defined as the hydrogen potential of a solution . ... Acids turn blue litmus paper into red whereas in case of Bases they turn red litmus paper into blue .

Please follow me!!!!

Answer:

Explanation:

Out of four given compounds , two will show cis-trans isomerism .

They are as follows ,

[Pt(NH₃)₂Cl₂]

and

[Cr(NH₃)₄Cl₂]+

see the attached file.

Answer:

d beacuse it uses lots of electricity

Answer:

True

Explanation:

If dominant traits are there, then they take over. Periot

Answer:

32.065 g

Explanation:

molecular weight of Sulfur or grams The molecular formula for Sulfur is S. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Sulfur, or 32.065 grams.

the answer is equator

Answer:

Sulfur

Explanation:

A non-metal in the third period that should have chemical properties similar to oxygen is sulfur.

This is because elements in the same group/family have similar chemical properties.

Answer:

1.12g/mol

Explanation:

The freezing point depression of a solvent for the addition of a solute follows the equation:

ΔT = Kf*m*i

Where ΔT is change in temperature (Benzonitrile freezing point: -12.82°C; Freezing point solution: 13.4°C)

ΔT = 13.4°C - (-12.82) = 26.22°C

m is molality of the solution

Kf is freezing point depression constant of benzonitrile (5.35°Ckgmol⁻¹)

And i is Van't Hoff factor (1 for all solutes in benzonitrile)

Replacing:

26.22°C = 5.35°Ckgmol⁻¹*m*1

4.90mol/kg = molality of the compound X

As the mass of the solvent is 100g = 0.100kg:

4.9mol/kg * 0.100kg = 0.490moles

There are 0.490 moles of X in 551mg = 0.551g, the molar mass (Ratio of grams and moles) is:

0.551g / 0.490mol

= 1.12g/mol

This result has no sense but is the result by using the freezing point of the solution = 13.4°C. Has more sense a value of -13.4°C.

Answer:

98N

Explanation:

fg=mg

=(10)(9.8)

=98N

Answer:

A physical change has taken place

Answer:

If a substance changes color after being reacted with another substance, it means a chemical reaction has taken place.

Explanation:

A physical change is a change in the form, such as Ice Cream melting, or an Ice Cube melting.

Answer:

See explanation

Explanation:

For Fe;

Fe2+(aq) + 2H+(aq) + S2-(aq) ----> FeS(s) + H2(g)

For Ni

Ni2+(aq) + 2H+(aq) + S2-(aq) ----> NiS(s) + H2(g)

For Cr

2Cr3+(aq) + 6H+(aq) + 3S2-(aq) ----->Cr2S3(s) + 3H2(g)

We must remember that in writing these equations, the number of electrons lost or gained must be balanced. The number of electrons lost by the metal must equal the number of electrons gained by hydrogen. This rule was followed in writing all the equations above.

Answer:

A is 1000, B is 1 and C is 5,400.

Explanation:

Hello!

In this case, since we are dealing with an unit conversion from liters to milliliters, we need to keep in mind that the proper conversion factor is:

[tex]\frac{1000mL}{1L}[/tex]

Thus, the set up turns out:

[tex]5.4L*\frac{1000mL}{1L} =5,400mL[/tex]

Thus, A is 1000, B is 1 and C is 5,400.

Best regards!

Answer:

This means Cu has 29 electrons as a neutral element. Cu-67 has 29 protons, 38 neutrons, 29 electrons.

Explanation:

Copper has 29 electrons, 29 protons, 38 neutrons.

The chemical element copper (Cu) is a reddish, very ductile metal belonging to Periodic Group 11 (Ib) that has an exceptional ability to conduct heat and electricity. In nature, copper may be found in its free metallic state.

Neolithic (New Stone Age) people originally utilized this local copper (about 8000 BCE) as a replacement for stone. Around 4000 BCE, Mesopotamia saw the beginning of metallurgy when copper was cast into molds, reduced to metal from ores with fire and charcoal, and purposefully alloyed with tin to become bronze (c. 3500 BCE).

Cyprus provided the majority of the copper the Romans used. Its name, Cyprium, or "metal of Cyprus," was eventually abbreviated to cyprium and then changed to cuprum. also, see bronze.

Basaltic lavas are a common source of native copper, which may also be found reduced from copper compounds including sulfides, arsenides, chlorides, and carbonates.

Therefore, copper has 29 electrons, 29 protons, and 38 neutrons.

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Answer:

The answer is thomson

Explanation: he is the one that said it first and then after they tried to take credit  but thomson  is the correct answer.

Answer: Br is the answer to the question.

Answer:

Alkyne

Explanation:

The homologous series for this compound is the Alkyne because of the presence of the triple bond present between the third and fourth carbon atoms as seen in the picture attached.

Answer:

2Na(s) + 2H2O(l) ------> 2NaOH(aq) + H2(g)

Explanation:

Answer:

(e) CO2 is formed twice as fast as ethane is consumed.

Explanation:

Since we have the equation of the reaction as;

2C2H6(g) + 7O2(g)  4CO2(g) + 6H2O(l)

The rate of consumption of ethene =  -1/2 d[C2H6]/dt

Rate of production of CO2= 1/4 d[CO2]/dt

Hence, CO2 is formed twice as fast as ethane is consumed.

Answer:

Concentration

Explanation:

Quizlet

Answer:

d

Explanation:

Answer:

The dark colored moths blended in while the light colored moths stand out. the light moths were hunted by predators and the black moths hid from them, making the light moths rare and the dark moths common.

Explanation:

The dark colored moths can survive easily from predators whereas, light colored moths are easily trapped by the predators due to their visibility. That's why light colored moths are rare and black colored are numerous in the environment.

According to the concept of survival of the fittest those organisms which are fit to survive in the nature will live more and others will extinct. The food chain in biosphere make the balance between various organisms where higher level organisms are the fittest to survive because they consume the lower level organism for food .

Some living things have certain peculiarity that make them adapted with adverse circumstances or save them from predators. For instance, chameleons shows the camoflouge that is the ability to change its color to protect themselves.

Similarly, the black moths cannot be identified easily by predators and very hard in the dark to see them whereas light moth are visible in the night and can be easily captured by predators. That's why they are less than black moth in population.

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