The arrangement in which the X substituents are at maximum separation is called the anti conformation. What is the dihedral angle between the X substituents for the anti conformation

Answer:

Radiocarbon dating is a method used for knowing the exact age of a fossil.

Explanation:

Radiocarbon dating is a fundamental tool for archaeologists use to determine the age of objects. According to new research, it's shown that radiocarbon dating standards cannot always accurate. The reason for it lies in the climatic condition of that particular area. Variations in the radiocarbon affected cite in the Levant region like Israel, Egypt, and Jordan.

Answer:

50 mol

Explanation:

Mass of methane = 800 g

Number of moles of CO₂ produced = ?

Solution:

Chemical equation:

CH₄ + 2O₂      →      CO₂ + 2H₂O

Number of moles of methane:

Number of moles = mass/molar mass

Number of moles = 800 g/ 16 g/mol

Number of moles = 50 mol

Now we will compare the moles of methane and carbon dioxide from balanced chemical equation.

                CH₄        :         CO₂

                   1           :          1

                 50          :        50

Answer:

[tex]\%_{X-122}=29.5\%[/tex]

Explanation:

Hello!

In this case, since isotopes are atoms of the same element with equal number of protons and electrons but different atomic mass, we can write the equation used to compute the average atomic mass of the considered X:

[tex]m_X^{avr}=\%_{X-120}*120+\%_{X-122}*122[/tex]

However since both percentages compose the 100%, we can write one of those in terms of the other:

[tex]m_X^{avr} = (100\%-\%_{X-122})*120+\%_{X-122}*122[/tex]

Thus, we can solve for the percent abundance of X-122 as shown below:

[tex]120.59 = 120-\%_{X-122}*120+\%_{X-122}*122\\\\120.59-120=\%_{X-122}(122-1200)\\\\120.59-120=\%_{X-122}*2\\\\\%_{X-122}=\frac{0.59}{2}=29.5\%\\[/tex]

Thus the percent abundance of the other isotope would be 70.5 %.

Best regards!

Answer:

[tex]x_{N_2F_2}= 0.415\\\\x_{SF_6}=0.585[/tex]

Explanation:

Hello!

In this case, since the mole fraction of both gases in the tank is computed via:

[tex]x_{N_2F_2}=\frac{n_{N_2F_2}}{n_{N_2F_2}+n_{SF_6}} \\\\x_{SF_6}=\frac{n_{SF_6}}{n_{N_2F_2}+n_{SF_6}}[/tex]

It means we need to compute the moles of each gas, just as it is shown down below:

[tex]n_{N_2F_2}}=5.53gN_2F_2*\frac{1molN_2F_2}{66.01gN_2F_2} =0.0838molN_2F_2\\\\n_{SF_6}=17.3gSF_6*\frac{1molSF_6}{146.06gSF_6} =0.118molSF_6[/tex]

Thus, the mole fractions turn out:

[tex]x_{N_2F_2}=\frac{0.0838mol}{0.0838mol+0.118mol}= 0.415\\\\x_{SF_6}=\frac{0.0838mol}{0.0838mol+0.0838mol}=0.585[/tex]

Best regards!

Answer:

The catalyzed reaction will take 2.85 seconds to occur.

Explanation:

The activation energy of a reaction is given by:                                                        

[tex] k = Ae^{-\frac{E_{a}}{RT}} [/tex]

For the reaction without catalyst we have:

[tex] k_{1} = Ae^{-\frac{E_{a_{1}}}{RT}} [/tex]   (1)

And for the reaction with the catalyst:

[tex] k_{2} = Ae^{-\frac{E_{a_{2}}}{RT}} [/tex]   (2)

Assuming that frequency factor (A) and the temperature (T) are constant, by dividing equation (1) with equation (2) we have:                      

[tex] \frac{k_{1}}{k_{2}} = \frac{Ae^{-\frac{E_{a_{1}}}{RT}}}{Ae^{-\frac{E_{a_{2}}}{RT}}} [/tex]

[tex] \frac{k_{1}}{k_{2}} = e^{\frac{E_{a_{2}} - E_{a_{1}}}{RT} [/tex]    

[tex] \frac{k_{1}}{k_{2}} = e^{\frac{59.0 \cdot 10^{3}J/mol - 184 \cdot 10^{3} J/mol}{8.314 J/Kmol*600 K} = 1.31 \cdot 10^{-11} [/tex]    

Since the reaction rate is related to the time as follow:

[tex] k = \frac{\Delta [R]}{t} [/tex]

And assuming that the initial concentrations ([R]) are the same, we have:

[tex] \frac{k_{1}}{k_{2}} = \frac{\Delta [R]/t_{1}}{\Delta [R]/t_{2}} [/tex]

[tex]\frac{k_{1}}{k_{2}} = \frac{t_{2}}{t_{1}}[/tex]

[tex] t_{2} = t_{1}\frac{k_{1}}{k_{2}} = 6900 y*1.31 \cdot 10^{-11} = 9.04 \cdot 10^{-8} y*\frac{365 d}{1 y}*\frac{24 h}{1 d}*\frac{3600 s}{1 h} = 2.85 s [/tex]

Therefore, the catalyzed reaction will take 2.85 seconds to occur.

I hope it helps you!                            

Answer:

Most likely phosphorus, antimony, arsenic, boron, indium or gallium. The wiring is composed mainly of copper, gold, and silver.

Answer:

Explanation:

18 gram of water contains 2 g of hydrogen

3.123 gram of water will contain 2 x 3.123 / 18 = .347 g of hydrogen .

44 gram of carbon dioxide contains 12 g of carbon

7.691 gram of carbon dioxide will contain 12 x 7.691 / 44 = 2.1 g of carbon .

So the sample will contain 2.912 - ( .347 + 2.1 ) g of oxygen .

= .465 g of oxygen .

moles of Carbon = 2.1 / 12 = .175

moles of hydrogen = .347 / 1 = .347

moles of oxygen = .465 / 16 = .029

Ratio of moles of carbon , oxygen and hydrogen ( C,O,H )

= 0.175 : 0.029 : 0.347

= .175/ .029 : 1 : .347 / .029

= 6 : 1 : 12

So empirical formula = C₆H₁₂O

Let the molecular formula be [tex](C_6H_{12}O)_n[/tex]

molecular weight = n ( 6 x 12 + 12x 1 + 16)

= 100 n

Given 100 n = 100.1

n = 1

Molecular formula = C₆H₁₂O.

Answer:

235.45 cm³

Explanation:

From the question given above, the following data were obtained:

Initial volume (V₁) = 220 cm³

Initial temperature (T₁) = 26 °C

Final temperature (T₂) = 47 °C

Pressure = constant

Final volume (V₂) =?

Next, we shall convert celsius temperature to Kelvin temperature. This can be obtained as follow:

T(K) = T(°C) + 273

Initial temperature (T₁) = 26 °C

Initial temperature (T₁) = 26 °C + 273

Initial temperature (T₁) = 299 K

Final temperature (T₂) = 47 °C

Final temperature (T₂) = 47 °C + 273

Final temperature (T₂) = 320 K

Finally, we shall determine the volume (i.e V₂) at 47 °C as follow:

Initial volume (V₁) = 220 cm³

Initial temperature (T₁) = 299 K

Final temperature (T₂) = 320 K

Final volume (V₂) =?

V₁ / T₁ = V₂ / T₂

220 / 299 = V₂ / 320

Cross multiply

299 × V₂ = 220 × 320

299 × V₂ = 70400

Divide both side by 299

V₂ = 70400 / 299

V₂ = 235.45 cm³

Thus, the volume at 47 °C is 235.45 cm³

Answer:

Explanation:

quantum number of neptunium is

6

    [tex]L_{11/2}[/tex]

Answer:hydrogen, deuterium, and tritium.

Explanation:

Answer:

Change occur in heat energy.

Explanation:

Change occur in the heat energy of molecules during condensation process. The molecules of gas releases its heat energy and converted into liquid state. With this heat energy, they are active and escape from each other but when the heat energy is removed from them, the attractive forces between these gas molecules are formed which convert them into liquid state so change in heat energy occur in the condensation process.

Answer:

3.09 atm

Explanation:

Given that:

Volume of container A = 717 mL

Pressure of container A = 2.80 atm

Volume of container B = 174 mL

Pressure of container B = 4.30 atm

Now, if the valve are being removed and the gases are allowed to mix together; then

The total final pressure can be calculated by using the formula:

[tex]P_f = \dfrac{P_AVA+P_BV_B}{V_A+V_B}[/tex]

[tex]P_f = \dfrac{2.80*717+4.30*174}{717+174}[/tex]

[tex]P_f = \dfrac{2007.6+748.2}{891}[/tex]

[tex]P_f = \dfrac{2755.8}{891}[/tex]

[tex]\mathbf{P_f =3.09 \ atm}[/tex]

The absence of the intermolecular attraction between the atoms or molecules is called an ideal gas.  The pressure of the resultant mixture is 3.09 atm.

The relationship between the pressure and the volume of the gas is given by Boyle's law which states the inverse proportionality relation with the volume.

Given,

The volume of container A = 717 mL

The volume of container B = 174 mL

The pressure of container A = 2.80 atm

The pressure of container B = 4.30 atm

The total final pressure of the ideal gas of the mixture is calculated by:

[tex]\begin{aligned} \rm P_{f} &= \rm \dfrac{P_{A}V_{A}+ P_{B}V_{B}}{V_{A}+V_{B}}\\\\&= \dfrac{2007.6 +748.2}{891}\\\\&= 3.09 \;\rm atm\end{aligned}[/tex]

Therefore, the total pressure of the mixture is 3.09 atm.

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Answer: an amount of space between two things or people.

Explanation: hope this helps? :)

The final temperature of the metal block : t=69.5 °C

Given

0.84 g water

Aluminum block = 51 g

Required

The final temperature

Solution

Enthalpy of vaporization of water is 44.0kJ/mol = 2.44 kJ/g=2440 J/g

Q out=Q in

Q releases = Q absorbed

Q water = Q Aluminum

m.Lf = m.cs.ΔT

0.84 x 2440 J/g = 51 x 0.903 J/g C x (t-25)

2049.6=46.053(t-25)

t=69.5 °C

.

Answer:

6. valence, 7. full outer shell, 8.8, 9.lose/gain, 10. share, 11. ionic, 12. covalent, 13. ions, 14, negative

Explanation:

Answer:

6)Valence

7)stability

8)2

9)transfer of

10)share

11)covalent

12)ionic

13)ion

14)negative

Polar solute dissolve in polar solvent and non polar solute dissolve in non polar solvent. Therefore, when any solute dissolves in a solvent, then the nature of solute and solvent is same.

Solubility shows the extent of solubility of a solute in solvent to make a solution. Solute is substances that is present in small amount. solvent is a substance that is present in large amount. Its SI unit is gram per litre or g/L.

Bond strength affect the solubility of a solute in solvent. weaker the bond strength is, more the solubility is. The weaker bond can be easily broken by water molecule.

Polar solute dissolve in polar solvent and non polar solute dissolve in non polar solvent. when any solute dissolves in a solvent, then the nature of solute and solvent is same.

Therefore, when any solute dissolves in a solvent, then the nature of solute and solvent is same.

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Answer:

[tex]n_{P_2O_5}^{max}=1.4molP_2O_5[/tex]

Explanation:

Hello!

In this case, since the reaction between phosphorous and oxygen to form diphosphorous pentoxide is:

[tex]2P+\frac{5}{2}O_2\rightarrow P_2O_5[/tex]

Thus, since phosphorous is in excess and oxygen and diphosphorous pentoxide are in a 5/2:1 mole ratio, we can compute the maximum moles of product as shown below:

[tex]n_{P_2O_5}^{max}=112 gO_2*\frac{1molO_2}{32.00gO_2}*\frac{1molP_2O_5}{5/2molO_2}\\\\ n_{P_2O_5}^{max}=1.4molP_2O_5[/tex]

Best regards!

Answer:

See explanation and image attached

Explanation:

Yttrium has many isotopes, the lowest mass number of Yttrium  is 89Y.

Recall that electron capture converts an electron into a proton and then into a neutron with a consequent emission of a neutrino (v).

In electron capture, the mass number of the daughter nucleus remains the same as that of the parent nucleus while the atomic number of the daughter nucleus is less than that of the parent by one unit.

Answer:

Vapor

Explanation:

Water can occur in three states: solid (ice), liquid, or gas (vapor). ... Water as a gas—vapor is always present in the air around us. You cannot see it. When you boil water, the water changes from a liquid to a gas or water vapor. As some of the water vapor cools, we see it as a small cloud called steam.

Water in the form of a gas is called water vapor. Water vapor refers to the gaseous form of water. It is created when liquid water evaporates or when solid ice sublimates directly into the gas phase

Water vapor is when water turns into gas. This happens when water turns into a gas without becoming a liquid first.

When water molecules get enough energy, their forces between each other become weaker, and they break away from the liquid phase to become water vapor in the gas phase. This happens at any temperature above the point where water turns into steam, which is 100 degrees Celsius (212 degrees Fahrenheit) when the air pressure is normal.

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Answer:

The atoms in the cup of coffee have more energy.

Explanation:

The difference between the hot cup of coffee and the piece of ice is their temperature. The hot cup of coffee has a higher temperature than the ice.

The relationship between the energy and temperature is a direct relationship. This means that higher temperature means higher kinetic energy and vice versa.

Since the hot cup of coffee has  a higher temperature, it means it also have the highest amount of energy. The correct option is;

The atoms in the cup of coffee have more energy.

Answer:

No.

Explanation:

He also created a telescope and formula for universal gravity.

Answer:

15×12=180

Explanation:

Force=Mass ×Acceleration

Answer: B) metals, non-metals, metalloids

An example of a metal is iron. A non-metal example is oxygen, which is a gas at STP (standard temperature and pressure).

A metalloid is a bit of a mix between a metal and non-metal element. It's sorta like an element that has both properties of metals and non-metals, or it's in a murky gray area. An example of a metalloid would be silicon.

Answer:

[tex]m_{Fe}=171.7gFe[/tex]

Explanation:

Hello!

In this case, since we have 245 of iron (III) oxide, we first need to compute the moles contained there:

[tex]n_{Fe_2O_3}=245gFe_2O_3*\frac{1molFe_2O_3}{159.7gFe_2O_3} =1.54molFe_2O_3[/tex]

Now, as 1 mole of iron (III) oxide is related to 2 moles of iron, due to iron's subscript in the molecule, we get the moles of iron itself:

[tex]n_{Fe}=1.54molFe_2O_3*\frac{2molFe}{1molFe_2O_3} =3.08molFe[/tex]

And the mass is computed based on the atomic mass of iron:

[tex]m_{Fe}=3.08molFe*\frac{55.8gFe}{1molFe} \\\\m_{Fe}=171.7gFe[/tex]

Best regards!

Incomplete question. However, I assumed you are referring to the comments made in the online animated video (Chemical and Physical changes)  by celebrity food scientist E. Mulson.

Explanation:

Recall in the video animation that E. Mulson defines physical reaction as occurring when "molecules in a substance stay the same, both before and after".

An example he gave was that of an orange getting juiced, the molecules remain the same before juicing, and after.

Answer:

Explanation:

1 % w/v of  phenolphthalein di-phosphate (PPP)

will contain 1 gram of  phenolphthalein di-phosphate (PPP) in 100 mL of solution

750 mL solution will contain 7.5 g of PPP

750 mL solution will contain 7.5 / 478 moles  of PPP

750 mL solution will contain .0157 moles  of PPP

So 7.5 g of PPP or .0157 mole of PPP will be needed .

Answer:

[tex]9.3x10^{26}molec\ I_2[/tex]

Explanation:

Hello!

In this case, considering the balanced chemical reaction:

Cl₂ + 2LiI ⇒ 2LiCl + I₂

We can see there is a 1:1 mole ratio between the produced iodine and the used chlorine, thus, we infer that the number of molecules of iodine given those of chlorine turn out:

[tex]9.3x10^{26}molec\ Cl_2*\frac{6.022x10^{23}molec\ I_2}{6.022x10^{23}molec\ Cl_2} =9.3x10^{26}molec\ I_2[/tex]

Best regards!

Answer:

9.3 × 10²⁶ molecules of I₂

Explanation:

Step 1: Given data

Step 2: Write the balanced single displacement reaction

Cl₂ + 2 LiI ⇒ 2 LiCl + I₂

Step 3: Calculate the molecules of I₂ produced from 9.3 × 10²⁶ molecules of Cl₂

According to the balanced equation, the molecular ratio of Cl₂ to I₂ is 1:1.

9.3 × 10²⁶ molecule Cl₂ × 1 molecule I₂/1 molecule Cl₂ = 9.3 × 10²⁶ molecule I₂