An electron in the n=7 level of the hydrogen atom relaxes to a lower energy level, emitting light of 93.1 nm.
What is the value of n for the level to which the electron relaxed?

Answers

Answer 1

answer:

nf=2

Explanation:

It is given that,

Initially, the electron is in n = 7 energy level. When it relaxes to a lower energy level, emitting light of 397 nm. We need to find the value of n for the level to which the electron relaxed. It can be calculate using the formula as :


Related Questions

Many cigarette lighters contain liquid butane, C4H10, which has a ∆H°ƒ = –147.6 kJ/mol. Using enthalpies of formation, calculate the quantity of heat produced when 1.0 g of butane is completely combusted in air. (Write the equation for the process first)

Answers

For cigarette lighters containing liquid butane, C4H10, the quantity of heat produced  is mathematically given as

q= -49.2 KJ

What is the quantity of heat produced when 1.0 g of butane is completely combusted in air?

Generally, the equation for the Chemical reaction   is mathematically given as

C₄H₁₀(l) + 6.5 O₂(g)---->4 CO₂(g) + 5 H₂O(l)

Therefore

dH°r = .(-393.5 ) + 5.(-285.5] - [1.(-147.6 )+6.5.

dH°r = -2853.9 kJ/mol

In conclusion, No.of mole

Nm = 1g/58g/mol

Nm= 0.01724mol

Hence, Heat of combustion

q = dH°r x moles

q = -2853.9 ×0.01724

q= -49.2 KJ

Read more about Chemical reaction

https://brainly.com/question/16416932

This question is in my General Chem 2 class. I will give Brainlist!


Given: 8As + 12H20 —>3H2AsO4- + 3H+ + 5AsH3 What mass of arsenic is required to produce 15.0 mL of 0.0852M H2AsO4-?

A. 0.0359 g

B. 0.255 g

C. 17.0 g

D.1134 g

Answers

Answer:

B

Explanation:

From the given chemical equation, we want to determine the mass of arsenic necessary to produce 15.0 mL of 0.0852 M H₂AsO₄⁻.

Find the amount of moles present in 15.0 mL of 0.0852 M H₂AsO₄⁻ solution. Recall that M = mol/L:

[tex]\displaystyle 15.0\text{ mL} \cdot \frac{0.0852\text{ mol H$_2$AsO$_4^-$}}{1\text{ L}} \cdot \frac{1\text{ L}}{1000\text{ mL}} = 0.00128\text{ mol H$_2$AsO$_4^-$}[/tex]

With stoichiometric ratios and molecular weights, determine the mass of arsenic necessary:

[tex]\displaystyle 0.00128 \text{ mol H$_2$AsO$_4^-$} \cdot \frac{8\text{ mol As}}{3\text{ mol H$_2$AsO$_4^-$}}\cdot \frac{74.92\text{ g As}}{1\text{ mol As}} = 0.256\text{ g As}[/tex]

In conclusion, the answer is B.

Which of the following mixtures cannot be separated by using both particle size and color as observable properties?
(A) Nickels and pennies
(B)Sand and rocks
(C) Stick and stones
(D)Salt and beans

Answers

Answer:

(A) Nickels and pennies

What pressure is exerted by 901.3 g of CH4 in a 0.690 L steel container at 185.7 K

Answers

Ideal gas law:  PV = nRT

Write down what you know and what you want to fine:

P = pressure = ?

V = volume in liters = 0.950 L

n = moles = 727.2 g x 1 mol CH4 / 16 g = 45.45 moles

R = gas constant = 0.0821 Latm/Kmol

T = temperature in K = 221.9K

Solve for P:

P = nRT/V = (45.45)(0.0821)(221.9) / 0.950

P = 872 atm (3 sig. figs. based on 0.950 L having 3 s.f.)

Which subshells (s, p, d, f, or g) can have electrons with the indicated magnetic quantum number (ml)?

Answers

Answer:

=3 means is 3 or greater so that would be f and g subshells

=0 means is 0 or greater so that would be s, p, d, f and g subshells

=1 means is 1 or greater so that would be p, d, f, and g subshells

=4 means is 4 or greater so that would be g only

b. A silver ring contains 1.1 × 1022 silver atoms. How many moles of silver are in the ring?

Answers

Answer:

1124.2

Explanation:

just easy mathamatics

What does thermodynamics study?
A. The properties of the nucleus
B. The strength of chemical bonds
C. The energy of motion and heat
D. The behavior of charged particles

Answers

Thermodynamics is the science that deals with work, temperature and heat. It studies the energy of motion and heat. Thus, option C is accurate.

What is thermodynamics?

Thermodynamics, thermo means heat and energy and dynamics means motion or movement. It is a branch of science that relates the entropy, enthalpy, and motion of matter.

It is used in physics and chemistry to depict the change in the system influenced by the surrounding. The release or the gain of heat in a thermodynamic system is studied as well.

Therefore, in option C the energy of motion and heat are studied in thermodynamics.

Learn more about thermodynamics here:

https://brainly.com/question/4280171

#SPJ1

If you have 146.0 grams of HCl, how many grams of H2O can that produce?

Answers

Answer:

9 gram of H2O can be produced

The thick old crust of earth is crust

Answers

Continental crust is thick and old -- on average about 50 km thick and about 2 billion years old -- and it covers about 40 percent of the planet. Whereas almost all of the oceanic crust is underwater, most of the continental crust is exposed to the air.

How many grams of CO2 ( Carbon dioxide gas ) will exert a pressure of 769 mmHg at a volume of 52.3L at 425K?

Answers

66.9 grams of CO₂ ( Carbon dioxide gas ) will be required to exert the given value of pressure at the given volume and temperature.

Ideal Gas Law

The Ideal gas law or general gas equation emphasizes on the state or behavior of a hypothetical ideal gas. It states that "the pressure multiplied by volume is equal to moles multiply by the universal gas constant multiply by temperature.

It is expressed as;

PV = nRT

Where P is pressure, V is volume, n is the amount of substance, T is temperature and R is the ideal gas constant ( 0.08206 Latm/molK )

Given the data in the question;

Pressure P = 769 mmHg = 1.01184atmVolume V = 52.3LTemperature T = 425KAmount of gas n = ?

To determine the amount of gas, we substitute our values into the expression above.

PV = nRT

n = PV / RT

n = ( 1.01184atm × 52.3L ) / ( 0.08206Latm/molK × 425K )

n = 52.919232Latm / 34.8755Latm/mol

n = 1.52mol

Now, we the mass of CO₂ ( Carbon dioxide gas ).

Molar mass of CO₂ is 44.01 g/mol

Hence;

1.52mol × 44.01 g/mol = 66.9g

Therefore, 66.9 grams of CO₂ ( Carbon dioxide gas ) will be required to exert the given value of pressure at the given volume and temperature.

Learn more about Ideal Gas Law here: brainly.com/question/4147359

What is the IUPAC name for the compound shown?

Answers

Answer:

2,2,3-trimethylpentane

Explanation:

The iupac name for the compound shown is 2,2,3-trimethylpentane

14. Which statement gives you enough information to say that the atom is electrically neutral?
A. The atom has 15 neutrons and 15 electrons.
B. The atom has 19 electrons and 19 neutrons.
C. The atom has 4 neutrons and 4 protons.
D. The atom has 7 protons and 7 electrons

Answers

The statement which gives you enough information to say that the atom is electrically neutral is: The atom has 7 protons and 7 electrons.

If you have 2m of hydrochloric acid and also 2m of vinegar which one is weak and strong and why?​

Answers

strong because it’s strong and all that it gives with it

how many oxygen atom in 0.25 mol ca(No3)2?

Answers

Answer:

1 molecule of Ca(NO3)2 has 6 oxygen atoms.

How many moles of CO2 will be produced in the following reaction if the initial amount of reactants was 0.50 moles?

2NaHCO3 —> Na2CO3 + CO2 + H2O

Answers

Answer:

In the following reaction, how many moles of

CO2

can be made by reacting 0.50 moles of

CH4

with excess oxygen?

CH4+O2>CO2+H2O

Explanation:

What family kept the kings of Nepal under guard and would not let them have any power.

Answers

Answer:

Gyanendra of Nepal

How many electrons are in the n = 2 shell of a magnesium atom?

Answers

Answer:

eight

Explanation:

That means there are 12 electrons in a magnesium atom

hope this helps

Insoluble sulfide compounds are generally black in color. Which of the following combinations could yield a black precipitate? a) Na2S(aq) + KCl(aq) b) Li2S(aq) + Pb(N03)2(aq) c) Pb(C103)2(aq) + NaNO3(aq) d) AgNo3(aq) + KCl(aq) e) K2S(aq) + Sn(N03)4(aq)

Answers

Answer:

b) Li2S(aq)+Pb(NO3)2(aq)

e) K2S(aq)+Sn(NO3)4(aq)

Explanation:

they are the only two of the options that contain a sulfide ion (S) therefore they are the only ones that could be considered in the question.

b) Li2S(aq)+Pb(NO3)2(aq)

e) K2S(aq)+Sn(NO3)4(aq)

Which pictures shows the proper structure of the water molecule? Click the picture to see each choice.

Answers

The third picture is the answer

Explanation:

there are 2 hydrogen atom 1 oxygen

3.Calculate the pH of a 0.250 M solution of potassium phenolate, KC6H5O. Ka for phenol (C6H5OH) is 1.0 x 10-10.

Answers

From the statement and the information available in the question, the pH of the solution is 12.2.

What is Ka?

The term Ka refers to the acid dissociation constant of a substance, we can obtain this by setting up the ICE table as shown;

       C6H5O^-  +   H2O ⇄  C6H5OH + OH^-

I         0.250                           0                0

C         -X                                +X             +X

E      0.250 -x                         x                x

Now;

Kb = 1 * 10^-14/ 1.0 x 10-10

Kb = 1 * 10^-4

Kb = [C6H5OH] [OH^-]/[C6H5O^-]

1 * 10^-4 = x^2/ 0.250 -x

1 * 10^-4 (0.250 -x) = x^2

2.5 * 10^-4 - 1 * 10^-4 x = x^2

x^2 + 1 * 10^-4 x  - 2.5 * 10^-4 = 0

x=0.016 M

Given that; [C6H5OH] = [OH^-] =x

pOH = -log(0.016 M) = 1.8

pH = 14 - 1.8 = 12.2

Learn more about Ka: https://brainly.com/question/16236454

How many Calories are contained in one tablespoon of palm oil, which has 45.3 g of fat? [Hint: One
gram of protein or one gram of carbohydrate typically releases about 4 Calg, while fat releases 9
Cal/g.] Report your answer to 1 significant figure.

Answers

Answer:

120 calories

Explanation:

Calories and nutrition for world population. One tablespoon of palm oil has 120 calories and 13.6 grams of fat. What does it tell you? Of the 13.6 grams of fat in a tablespoon of palm oil, 6.7 grams are saturated and 6.3 grams are unsaturated.

If 53.6 g of Cu(NO3)2 were produced, how many grams of Cu reacted?

Answers

Answer:

The amount of grams of Cu that reacted is 18.15g

Explanation:

Where:.

Cu= 63.5

O= 16

N= 14

Molar mass of Cu(NO3)2 =

63.5 + 2(14+ 48)

63.5 + 124

=187.5

THEN IF 63.5g of Cu reacted in 187.5g of Cu(NO3) 2

x of Cu is in - - - - >53.6g

x= 63.5 * 53.6/187.5

x= 3403.6/187.5

x= 18.15g of Cu reacted.

You wish to prepare a buffer containing CH3COOH with a pH of 5.14. If the pka of acetic acid is 4.74, what ratio of
[CH3COO-]/[CH3COOH] must you use?
A 0.70
B 4.0
C 0.40
D 2.0
E 2.5

Answers

Answer:

E

Explanation:

Recall the Henderson-Hasselbalch equation:

[tex]\displaystyle \text{pH} = \text{p}K_a + \log \frac{[\text{Base}]}{[\text{Acid}]}[/tex]

For a pH of 5.14 with the given pKa of 4.74, solve for the ratio between acetate and acetic acid:

[tex]\displaystyle \begin{aligned} (5.14) & = (4.74) + \log\frac{[\text{CH$_3$COO$^-$}]}{[\text{CH$_3$COOH}]} \\ \\ \log\frac{[\text{CH$_3$COO$^-$}]}{[\text{CH$_3$COOH}]}& = 0.40 \\ \\ \frac{[\text{CH$_3$COO$^-$}]}{[\text{CH$_3$COOH}]} & = 10^{0.40} \\ \\ & = 2.5\end{aligned}[/tex]

In conclusion, the answer is E.

A sample of water goes through a temperature change of -74.14 °C while releasing 578.7 joules of heat. The specific heat capacity of water is 4.184 J/(g·°C). What is the mass of this sample? grams (Report your answer using 4 significant figures).

Answers

Answer:

[tex] \boxed{ \sf \: m = 1.866 \: grams}[/tex]

Explanation:

Given:

Change in temperature ∆T= -74.14°C

Heat(Energy) released Q= 578.7 joules

Specific heat capacity s = 4.184 J/(g·°C)

To find:

Mass of the sample (m)=?

Solution:

[tex] \sf s= \frac{Q}{m \cdot \Delta T} \\ \sf \: Substituting \: the \: given \: parameters \\ \sf 4.184 = \frac{578.7}{m \times ( - 74.14)} \\ \sf m = \frac{578.7}{4.184 \times ( - 74.14)} \\ \sf m = \frac{578.7}{310.20176} \\ { \sf m = 1.8655 \approx1.866 \: grams}[/tex]

Since, we need the answer in 4 significant figures,

[tex] \boxed{ \sf \: m = 1.866 \: grams}[/tex]

Learn more about specific heat here

brainly.com/question/27365354

Thanks for joining brainly community!

19. Which reaction will form a salt and water?
Aa precipitation reaction
Ba displacement reaction
Can acid-base neutralization
Dan ionic dissociation reaction

Answers

Answer:

acid-base neutralization

Explanation: When a base and acid react, it neutralizes the substance making it a neutral substance, which is water and a salt

How do you think life on Earth would be different without the evolution of angiosperms? Provide two examples, each with an explanation.
PLSSS HURRRYYY!!!!!! WILL GIVE BRAINLIEST!!!

Answers

Answer:

Without angiosperms, average annual rainfall in the area declined by 300 millimeters. In the eastern Amazon basin, the length of the wet season decreased by nearly 3 months. The extent of the wettest rainforests, which receive more than 100 millimeters of rain per month, shrank by 80%.

How do I solve this

Answers

Answer:

try doing a math problem it may help

Explanation:

Please show work, thanks!

Answers

In chemistry, “partial pressure” refers to the pressure that each gas in a gas mixture exerts against its surroundings, such as a sample flask, a diver’s air tank, or the boundary of an atmosphere. You can calculate the pressure of each gas in a mixture if you know how much of it there is, what volume it takes up, and its temperature. You can then add these partial pressures together to find the total pressure of the gas mixture, or, you can find the total pressure first and then find the partial pressures.

PLEASE HELP 50 Points which of Erwin Shrodinger's contributions are present in the modern atomic model and which were eventually disproven and thus are not part of the modern model?

Answers

Answer:yes is yes = 0iq

Explanation: hes was a prodogy he helped alot of people -500iq

what is joule ?
a. time
b. mass
c. volume
d. length
e. none ​

Answers

Explanation:

It is the unit of work or energy

Other Questions
Will give brainlyestChoose one aspect of human environmental interaction in South Asia, and write an essay (80-100 words) that shows how humans cause changes in the environment and how they are affected by those changes. please help please!!!!! Popular culture is practiced by a diverse and __________ group of people. a. dysfunctional b. well-educated c. homogeneous d. heterogeneous Based on the audio, what is true about the animal in the audio? it flies when threatened. it is a farm animal. it is valued for its meat. it lives in prairies. What is quick to fly but having flown it always stops to rest. Ben takes 3 hours to wash 273 dishes, and Frank takes 4 hours to wash 444 dishes. How long willthey take, working together, to wash 3200 dishes?It will take Ben and Frankhour(s) andminute(s) to wash 3200 dishes together.If needed, round answer to 1 decimal places. Discussion: Descriptive StatisticsGraded DiscussionDiscussion TopicPeople use data and statistics to help them make important policy decisions, to identify problems in an organization, and to predict outcomes. In thisunit, you studied various ways to analyze and represent data sets to determine how to best interpret the data. You also learned how to critically examinethe data and account for outside factors that may influence the patterns you see in the data.Think about the many statistical scores or rankings you receive in school, such as GPA, SAT and ACT scores, test scores, and class ranking. Describethe usefulness and limitations of these pieces of data in defining who you are as a person or as a student. In what ways do they help give a clearpicture? What are they not conveying? Why does Esperanza want to eat lunch at school in "A Rice Sandwich"?She sees the kids who eat lunch at school as "special."She doesn't get along with her mother, so she doesn't want to eat lunch withher.Nenny, Carlos, and Kiki eat lunch at home, and she is tired of fighting with them.Her house is so far from the school that she is late returning to class after lunchevery day. In the late 1800s, anti-chinese sentiment grew because labor unions promoted the idea that chinese immigrants were taking american jobs by moving into chinatowns. organizing labor unions. intimidating american workers. working for lower pay. A company sells kayaks for $575. Each kayak costs them $480 to manufacture. Write a linear function that represents the profit generated from selling the manufactured kayaks. The longest river in the United States, which stretches from Minnesota tcthe Gulf of Mexicc. is the: * TriangleABC with vertices A(4, 2), B(-3, 1), and C (-3, 1) is translated so that A isnow (1, 5). What was the translation,and where are B and C? Remember the 8 steps that will help you make good financial decisionsPut yourself in a calm state. Decisions made from fear or worry are rarely sound. ...Gather all your information. ...Clearly state your goals. ...Research your options. ...Weigh the potential outcomes. ...Sleep on it. ...Make a decision and act on it! ...Evaluate your results.Using information gained from this unit, respond to the following scenarios.Scenario 1You want to purchase a new vehicle and you have your heart set on a brand new SUV. You take out a loan to pay for the car, but after six months you begin to fall behind on payment and incur late fees.How would you use the decision making steps in this scenario?Does your credit score go up or down?Why does it go up or down?If your score goes down, how can you fix it? All writing has the same exact goal. True False Please i need your help Digital publications, like modern websites, that allow you to click anywhere on a page without having to go in any particular order have:A. linear navigation. B. circular navigation. C. non-linear navigation. D. cross navigation How did the creation of new state constitutions affect the South after a few years?It increased the power of people experiencing poverty by giving them positions in government.It created a backlash that put rich white southerners back in control.It increased the number of women in government, giving them power.It allowed African Americans to take control of government. A model that has 4 points and 6 lines containing exactly two points An example of a pendulum is the wrecking ball, which is sometimes used to tear down old buildings. The arm of a pendulum, in this case the ball, swings according to the formula: s= 2 pi sqrt l/32 where S is the amount of time, in seconds, for one full swing, and L is the length of the pendulum, in feet. If the wrecking ball is attached to the crane by a 50 ft cable, how long will it take for the wrecking ball to complete one full swing? help me pls i dont get it What does smoking during pregnancy increase the chances of?O diabetesO miscarriageO heart problemsO alcohol addiction