Use the reaction l2(s) = 12(9), AH = 62.4 kJ/mol, AS = 0.145 kJ/(mol-K), for
this question
At what temperature is the reaction at equilibrium?
A. 157 K
B. 62 K
C. 0.002 K
D. 430 K

Answer:

B. psi

Explanation:

Pa is Pascal

atm is atmosphere

Hg is Mercury

hope it helps.

Answer:therefore the oxidation state of sulphur is +6 in the compound CaSO4.

Explanation:

Answer:

Option 3

[tex]MgCO_{3}[/tex]

Explanation:

These are the steps for empirical forumla

1) If given percentage, assume everything in grams

2) Convert those grams to moles (using specific molar mass of each unique element)

3) Divide all the moles by the smallest mole you discovered.

4) Answer will be close to a whole number for each element and that's the answer.

First step, 28.6 g Mg, 14.3 g C, 57.1 g O

Second step:

28.6/24.305 = 1.1767 Mg

14.3/12.01= 1.1907 C

57.1/16.00 = 3.5688 O

Third step:

1.1767/1.1767 = 1 Mg

1.1907//1.1767 ~ 1 C

3.5688/1.1767 ~ 3 O

Put everything together you get!

[tex]MgCO_{3}[/tex]

The empirical formula for the compound is:

C. [tex]MgCO_3[/tex].

A chemical formula showing the simplest ratio of elements in a compound rather than the total number of atoms in the molecule.

Given:

28.6 g Mg, 14.3 g C, 57.1 g O

In order to determine empirical formula we will divide mass of each given  element with the molar mass of the respective element.

[tex]\frac{28.6}{24.305} = 1.1767 Mg[/tex]

[tex]\frac{14.3}{12.01}= 1.1907 C[/tex]

[tex]\frac{57.1}{16.00} = 3.5688 O[/tex]

Dividing each mass with the lowest mass:

[tex]\frac{1.1767}{1.1767 } = 1 Mg[/tex]

[tex]\frac{1.1907}{1.1767 } = 1 C[/tex]

[tex]\frac{3.5688}{1.1767} =3 O[/tex]

Thus, the empirical formula for the compound is [tex]MgCO_3[/tex].

Therefore, option C is correct.

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Answer:

C. They have the same number of protons.

Explanation:

Even though in isotopes, there's uneven number of neutrons, there's always same number of protons.

Hope it helps.

Answer:

E. Mass number

H. Ion

F. Isotopes

I hope you have a great day. I'm sorry that I didn't know C or I.

Answer:

Moles = mass(m) / Molar mass (M)

A. 1.24g of Zn

m = 1.24g

M = 65.4 g/mol

moles of Zn = 1.24g/ 65.4g/mol

= 0.01896mol

B. 28.1 g Ar

m = 28.1g

M(Ar) = 39.9g/mol

moles of Ar = 28.1g/39.9g/mol

= 0.7043 mol

C. 84.0 g Ta

m = 84.0g

M(Ta) = 181g/mol

moles of Ta = 84.0g/181g/mol

= 0.4641 mol

D. 2.29x10^-2 g Li

m = 2.29x10^-2 g

M(Li) = 6.9g/mol

moles of Li = 2.29x10^-2 g / 6.9g/mol

= 0.0033 mol

Hope this helps

Answer:

0° Celsius

Explanation:

The thermometer shows 0° Celsius which corresponds to 32° F.

Answer:

0 degrees celsius

Explanation:

just did the test

Answer:

salt

Explanation:

xdcfgvh jhg

Answer:

FROM the magnetic point of view, phosphorus is an extremely interesting

substance because of its allotropic modifications. The ordinary forms are

the yellow (or white) and the red varieties. X-ray investigations indicate

that probably yellow phosphorus is analogous with the cubic forms of antimony and arsenic; and red phosphorus with monoclinic antimony and

arsenic (Mellor, 1928). The conclusions of different workers on the structure of red phosphorus are not in agreement. There is also Bridgman's black

phosphorus which is probably hexagonal (Linck and lung, 1925). Natta

and Passerini (1930) have studied the crystal structure of white phosphorus.

This substance when condensed at the temperature of liquid ammonia is

cubic. Atomic positions however are yet undetermined. Another and noncubic form is obtained by condensation at liquid-air temperatures. It is

thus clear that most likely white phosphorus is cubic in structure with a

probable superposition of another lattice.

The evidence from Raman effect also points to the same conclusion.

Bhagavantam (1930) investigated the Raman effect of white phosphorus in

the solid state. The characteristic frequencies obtained by him are 607, 468

and 374. Since the phosphorus molecule is known to contain 4 atoms,

Bhagavantam (1930) has shown that the tetrahedral structure fits the results

satisfactorily since such a structure would give only three frequencies. But

for the particular law of forces adopted, the frequencies should have the

ratio 2: 2: 1 but the observed frequencies deviate considerably.

Phosphorus is a really intriguing element. because of the allotropic changes to the material.

Red phosphorus is likely akin to monoclinic antimony, while yellow phosphorus is probably similar to the cubic forms of antimony and arsenic.

There is disagreement among the findings of many researchers regarding the structure of red phosphorus. Additionally, Bridgman's black It is presumably hexagonal, phosphorous (Linck and lung, 1925). Natta and Passerini (1930) have investigated the white phosphorus crystal structure.

Condensed from this material at liquid ammonia temperature is cubic. However, the locations of the atoms are still unknown. Condensation at liquid air temperatures yields a different, noncubic shape.

Therefore, Phosphorus is a really intriguing element. because of the allotropic changes to the material.

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Answer:

0.01836 M

Explanation:

Again the reaction equation is;

Fe(s) + Mn2+(aq) → Fe2+(aq) + Mn(s)

E°cell= 0.77 V

Ecell= 0.78 V

[Mn2+] = 0.040 M

[Fe2+] = the unknown

n=2

From Nernst's equation;

Ecell= E°cell- 0.0592/n log Q

0.78= 0.77 - 0.0592/2 log [Fe2+] /[0.040]

0.78-0.77= - 0.0592/2 log [Fe2+] /[0.040]

0.01/ -0.0296= log [Fe2+] /[0.040]

-0.3378= log [Fe2+] /[0.040]

Antilog(-0.3378) = [Fe2+] /[0.040]

0.459= [Fe2+] /[0.040]

[Fe2+] = 0.459 × 0.040

[Fe2+] = 0.01836 M

The Fe ion concentration in the galvanic cell has been 0.0186 M.

The Nernst equation has been used for the determination of the voltage of the galvanic cell.

It can be given as:

[tex]\rm E_c_e_l_l\;=\;E_0\;-\;\dfrac{0.059}{n}\;\times\;log\;\dfrac{[Fe^+]}{[Mn^2^+]}[/tex]

where, n = number of electrons transfer = 2

[tex]\rm E_0[/tex] = initial voltage = 0.77 V

[tex]\rm E_c_e_l_l[/tex] = cell voltage = 0.78 V

Iron ion concentration = 0.040 M

Susbstituting the values:

0.78 = 0.77 - [tex]\rm \dfrac{0.059}{2}\;\times\;log\;\dfrac{[Fe^2^+]}{[0.040]}[/tex]

0.78 - 0.77 = -0.0296 [tex]\rm \times\;log\;\dfrac{[Fe^2^+]}{[0.040]}[/tex]

-0.03378 = [tex]\rm log\;\dfrac{[Fe^2^+]}{[0.040]}[/tex]

antilog (-0.03378) = [tex]\rm \dfrac{[Fe^2^+]}{0.040}[/tex]

Iron ion concentration = 0.0186 M

Thus, the Fe ion concentration in the galvanic cell has been 0.0186 M.

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Answer:

atoms are bonded with a single bond one double bond

Answer:

70.906 g/mol

Explanation:

Answer:

71

Explanation:

mass = mole x molar mass (Mr)

        = 1 x ( 35.5 + 35.5)

        = 71

Answer:

cadaverine

Explanation:

Cadaverine is a chemical compound with the IUPAC name of pentane-1,5-diamine. It is a chemical compound that emits a foul odour when decomposers like bacteria act on dead animal tissues.

Cadaverine is a product of protein hydrolysis by bacteria in dead tissues, specifically when amino acid LYSINE is decarboxylated. Hence, cadaverine is the compound responsible for the terrible smell produced when a dead animal is being decomposed.

Answer:

Mass (m) = Number of moles(n) × Molar mass (M)

A. 6.65 mol W

M (W) = 184 g/mol

n = 6.65mol

mass of W = 6.65 × 184 = 1223.6g

B. 0.588 mol Ba

M(Ba) = 137g/mol

n = 0.588 mol

mass of Ba = 0.588 × 137 = 80.556g

C. 68.4 mol Xe

M(Xe) = 131g/mol

n = 68.4 mol

mass of Xe = 68.4 × 131 = 8960.4g

D. 1.57 mol S

M(S) = 32.1 g/mol

n= 1.57 mol

mass of S = 1.57 × 32.1 = 50.397g

Hope this helps

Answer:

A. Arsenic

Explanation:

Arsenic is a metalloid. Arsenic has properties of both metals and non-metals that is why it is a metalloid.

Potassium, chlorine, and indium do not have both properties of metals and non-metals, therefore they are not metalloids.

Answer: A

Explanation: have a nice day

Answer : The formula for each of the following is:

(a) [tex]C_{22}H_{46}[/tex]

(b) [tex]C_{17}H_{34}[/tex]

(c) [tex]C_{13}H_{24}[/tex]

Explanation :

The general formula of alkanes is [tex]C_n H_{2n+2}[/tex] where n is the number of the carbon atoms present in a molecule of alkane.

The general formula of alkenes is [tex]C_n H_{2n}[/tex] where n is the number of the carbon atoms present in a molecule of alkene.

The general formula of alkynes is [tex]C_n H_{2n-2}[/tex] where n is the number of the carbon atoms present in a molecule of alkyne.

(a) An alkane with 22 carbon atoms

Putting n = 22 in the general formula of alkane, we get the formula of alkane as, [tex]C_{22}H_{2(22)+2}[/tex] or [tex]C_{22}H_{46}[/tex]

(b) An alkene with 17 carbon atoms

Putting n = 17 in the general formula of alkene, we get the formula of alkene as, [tex]C_{17}H_{2(17)}[/tex] or [tex]C_{17}H_{34}[/tex]

(c) An alkyne with 13 carbon atoms

Putting n = 13 in the general formula of alkyne, we get the formula of alkyne as, [tex]C_{13}H_{2(13)-2}[/tex] or [tex]C_{13}H_{24}[/tex]

Answer:

[tex]\huge \boxed{{C_{22} H_{46} \ \ \ \ C_{17} H_{34} \ \ \ \ C_{13} H_{24}}}[/tex]

Explanation:

[tex]alkanes \ \Rightarrow \ C_n H_{2n+2}[/tex]

[tex]C_{22} H_{2(22)+2}[/tex]

[tex]C_{22} H_{44+2}[/tex]

[tex]C_{22} H_{46}[/tex]

[tex]alkenes \ \Rightarrow \ C_n H_{2n}[/tex]

[tex]C_{17} H_{2(17)}[/tex]

[tex]C_{17} H_{34}[/tex]

[tex]alkynes \ \Rightarrow \ C_n H_{2n-2}[/tex]

[tex]C_{13} H_{2(13)-2}[/tex]

[tex]C_{13} H_{26-2}[/tex]

[tex]C_{13} H_{24}[/tex]

Answer:

Jeweler B = more accurate

Jeweler A = more precise

Error:

0.008, 0

% error :

0.934% ; 0

Explanation:

Given that:

True mass of nugget = 0.856

Jeweler A: 0.863 g, 0.869 g, 0.859 g

Jeweler B: 0.875 g, 0.834 g, 0.858 g

Official measurement (A) = 0.863 + 0.869 + 0.859 = 2.591 / 3 = 0.864

Official measurement (B) = 0.875 + 0.834 + 0.858 = 2.567 / 3 = 0.8556

Accuracy = closeness of a measurement to the true value

Accuracy = true value - official measurement

Jeweler A's accuracy :

0.856 - 0.864 = - 0.008

Jeweler B's accuracy :

0.856 - 0.856 = 0.00

Therefore, Jeweler B's official measurement is more accurate as it is more close to the true value of the gold nugget.

However, Jeweler A's official measurement is more precise as each Jeweler A's measurement are closer to one another than Jeweler B's measurement which are more spread out.

Error:

Jeweler A's error :

0.864 - 0.856 = 0.008

% error =( error / true value) × 100

% error = (0.008/0.856) × 100% = 0.934%

Jeweler B's error :

0.856 - 0.856 = 0 ( since the official measurement as been rounded to match the decimal representation of the true value)

% error = 0%

Answer:

a. 1,2,and 3.

Explanation:

When something turns liquid, e.g. metal, you need to heat it. When something turns gas, e.g. water, you need to heat it. And when something goes directly from solid to gas, e.g. dry ice, carbon dioxide, you need to add heat to it. hope this helps! Please mark brainiest.

Answer:

a. N₂(g) + O₂(g) → 2 NO(g)

b. 2 HgO(s) → 2 Hg(l) + O₂(g)

c. 4 Fe(s) + 3 O₂(g) → 2 Fe₂O₃(s)

d. 2 Na(s) + Cl2(g) → 2 NaCl(s)

e. 2 Cu₂O(s) + O₂(g)  → 4 CuO(s)

Hope this helps.

Answer:

Option D. For every mole of iron oxide consumed, two moles of iron are produced.

Explanation:

The balanced equation for the reaction is given below:

Fe2O3 + 3CO —> 2Fe + 3CO2

From the balanced equation above,

1 mole of iron oxide, Fe2O3 reacted with 3 moles of carbon monoxide, CO to produce 2 moles of iron, Fe and 3 moles of carbon dioxide, CO2.

Thus, with a careful observation of the equation, we can conclude that for every 1 mole of iron oxide, Fe2O3 consumed, 2 moles of iron, Fe are produced.

Answer: B: Earths tilt

Explanation:

Seasonal variation occurs because the Earth is tilted on its axis by 23.5˚. As Earth orbits the sun, its orientation to the sun changes.

Answer:

A

Explanation:

Answer:

A

Explanation:

"It means of solving a problem or dealing with a difficult situation."

Answer:

No because hydrogen chloride is gas and hydrochloric acid is (as stated in the name) an acid. The formula for hydrogen chloride is HCI(g), the little g states that the compound is a gas and the formula for hydrochloric acid is HCl(aq) and the little aq means aqueous.

Answer:

no. they are not the same

Explanation: Although, they both do have the same chemical formula HCL, they differ in their states of matter. Hydrogen chloride is a gas whereas hydrochloric acid is a solution of hydrogen chloride gas and water( creates an aquaeous solution). Hydrochloric acid is highly corrossive.

Answer: Change in a single nitrogen base in the DNA sequence will not have any significant effect on the organism.

So A

Explanation:

This is known as point mutation and it does not have any significant change in the protein and it is least harmful type of DNA mutation.

Answer:

No

Explanation:

Most Sulfonamides are antibiotics that kill bacteria but not human cells.  They work by distrupting the production of dihydrofolic acid (form of folic acid that human/bacteria cells use for protein production).

Answer:

The electron configuration for zinc is 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰. To find electron configuration, simply follow the periodic table from top to bottom, left to right (basically increasing atomic number) until you reach the element you are looking for.

Answer:

The last option, option D is correct.

The order of increasing ionic radii of the three ions given is

Na⁺ < F⁻ < Cl⁻

Check Explanation for reasons why.

Explanation:

For elements in the same group of the periodic table, the ionic radii increases as we move down the group. This is because the number of shells increase as we move further down a group in the periodic table and that automatically confers a bigger radii to the element with the more shells.

So, between F⁻ and Cl⁻, we know the fluoride ion has electronic configuration 2, 8 (2 shells) after it gains an electron to its normal electronic configuration to form the ion, but the chloride ion has electronic configuration 2, 8, 8 (3 shells) when it achieves its own stable octet of outermost electrons.

So, it is clear how Cl⁻ ion has a bigger ionic radii than F⁻ and even Na⁺.

Then, to know which ion is bigger between Na⁺ and F⁻, it is known that when cations and anions have the same electronic configuration, the cations usually have the lesser ionic radii.

This is because in a normal, neutral atom, the number of electrons in the atom matches the number of protons. And the force of attraction between the protons and the electrons matches each other as they both have the same charges and are equal in number.

But cations result from the neutral element losing one or more electrons to achieve that stable octet. This makes the number of protons to exceed the number of electrons, hence, the electrons available are more tightly pulled towards the centre of the atom by the protons in the nucleus of the atom. This results in a reduced ionic radii.

Unlike anions that gain electrons to achieve that stable octet and have the electrons exceeding the protons in their ions, causing the pull of the protons on the electrons to be reduced, thereby resulting in a more repelled electrons pushing the ionic radii further than normal thereby increasing it.

Hope this Helps!!!

Answer:

w&x

Explanation:

The planets which are likely to be gas giants are W and X

Gas giant planets are planets which constitutes of only two gases; hydrogen and helium.

However, of all the planetry solar system, there are only four planets which are the major gas giant planets:

In conclusion, the planets which are likely to be gas giants are W and X

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Answer:

in some animal they changes their body temperature according to the environment temperature. so are called cold blooded animals.they change their temperature for adaptation.