A fictitious element X is composed of 10.0 percent of the isotope 55 X, 20.0 percent of the
isotope 56 X, and 70.0 percent of the isotope 57 X. Estimate the atomic mass of element X.

Answers

Answer 1

Answer:

56.6 g/mol.

Explanation:

Assuming here that we have 100 atoms of each element. The percentage tells us that we have 10 atoms of the 55 isotope, 20 of the 56, and 70 of the 57.  

So the total is 10*55 + 20*56 + 70*57 = 5,660. And to get the average, we just divide by the total number of atoms (100).  

Atomic mass = 5660/100 = 56.6  


Related Questions

Using the formula velocity = distance/time, how fast does sound travel in air at 20 degrees C given a distance of 500 m and 3.92 seconds.

A- 3.92
B- 127 m/s
C- 2,941 m/s
D- 746 m/s

Answers

Answer:

B : 127m/s

Explanation:

= 500 ÷ 3.92

= 127.5

When does an electrically charged object attract another object?

A. When one object is far away from the other
B. When each object is negatively charged
C. When the objects are oppositely charged
D. When each object is positively charged

Answers

Answer:

C. When the objects are oppositely charged

Explanation:

Electrostatic interactions are commonly observed whenever one or more objects are electrically charged. Two oppositely-charged objects will attract each other. A charged and a neutral object will also attract each other. And two like-charged objects will repel one another.

From Bing, this is not my work

Answer:C

Explanation:

CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC! lol i think its c

?C6H6+O2 coefficient​

Answers

Answer:

2C6H6

Explanation:

C6H6 + O2 = CO2 + H2

2C6H6 + 15O2 → 12CO2 + 6H2O


What type of reaction is represented by the chemical equation shown
below?
2PbO2 → 2PbO + O2

decomposition
single replacement
synthesis
deouble replacement

Answers

Answer:

Decomposition reaction

Explanation:

2PbO2 → 2PbO + O2

2PbO2 is reactant.

2PbO + O2 is the product.

Definition : -

Decomposition reaction is a chemical reaction in which a single reactant breaks down to simpler products.

a change in the composition of matter _____________ occurs during a chemical reaction.

Answers

Answer: During a chemical change, the composition of matter always changes

Explanation:

A gas has a volume of 275 mL and a pressure of 3 atm. What is the new volume if the pressure decreases to 1.8 atm?

Answers

Answer:

Use Boyles law.

Given:

P1=3atm

V1=275mL

P2=1.8atm

V2=?

P1V1=P2V2

3x275=1.8xV2

V2=3x275/1.8

V2=458.3mL

Which term describes the total internal energy of a material due to the motion
of its particles?
A. Nuclear energy
B. Thermal energy
Ο Ο Ο
C. Electrical energy
D. Chemical energy

Answers

Answer:

Thermal Energy

Explanation:

Thermal energy is the total internal kinetic energy of an object due to the random motion of its atoms and molecules They consist of the sum of the internal kinetic energy (thermal energy) and the potential energy of an object.

Answer:

B. thermal energy.

Thermal energy or heat is due to the movement or vibrations of tiny particles such as atoms and molecules.

Explination:

Einstein proved the existense of atoms through his observation of Brownian Motion (the random movement of a dust particle, caused by it bumping into atoms).

write a general equation for the reaction of an alkali metal with water.

Answers

Answer:

Alkali metals are highly reactive metals. These metals are that much reactive that they can even explode in the air as well. When alkali metals and water react with each other, there is a formation of metal hydroxide and the evolution of hydrogen gas.

The general representation of metal is A. so, the general equation for the reaction of an alkali metal with water is given below.

2A(solid)+2H2O(liquid) -------> 2AOH(aqeous)+H2(gas)

Someone pls help me I will make you brain

Answers

I think it's true look at the picture

Answer:

false, true and i dk what the other answer choices are for the 3rd questions

Explanation:

Que relación tiene el metabolismo celular con el mantenimiento de los seres vivos

Answers

El metabolismo es un proceso por el cual los seres vivos ganan masa y energía que ofrece el medio en el que viven y sirve para el mantenimiento, crecimiento y reproducción de estos.

Si tomamos en cuenta la clasificación de los seres vivos tenemos:

- Autótrofos: Crean su propio alimento por medio del sol o la tierra y no de otros seres vivos (plantas, vegetales y algas).

- Heterótrofos: Generan su propio alimento y dependen de los autótrofos o de otros heterótrofos para su alimentación (animales y algunas bacterias).

El metabolismo se divide en dos procesos conjugados, el catabolismo y el anabolismo. Estos procesos dependen el uno del otro.

Las reacciones catabólicas liberan energía, mientras que las reacciones anabólicas, utilizan esa energía liberada para recomponer enlaces químicos y construir componentes de las células como las proteínas y los ácidos nucleicos..

De esta manera se relacionan ambos

Why do you think the term ionic is used to describe compounds formed from a metal element and a nonmetal element?

Answers

Answer:

All compounds form when atoms of different elements share or transfer electrons. Compounds in which electrons are transferred from one atom to another are called ionic compounds.

Explanation:

Because the positive and negative charges cancel out, an ionic compound is neutral in charge.

Kim loại đòng sắt đc tạo từ nguyên tố nào

Answers

Answer:

sup brö how is it back home?

Explanation:

just curious you know

Someone pls help me I will make you brain

Answers

Answer:

A

Explanation:

1. What amount of ammonia (in moles) is produced by the reaction of 4.00 mol H2 with 3.00 mol Nz?
3 H2(g) + N2(g) → 2 NH3(g)

Answers

Answer:  6 moles

Explanation:

3 H₂    +    N₂   →   2 NH₃

   ↓            ↓

4 mol       3 mol

Since the moles of N₂ is the smaller of the two reactants, then N₂ is the limiting factor (the reactant that will decide how much ammonia is produced since it has the smaller amount of moles). ∴ we have to use it in calculating the number of moles of ammonia

The mole ratio of N₂ to NH₃ based on the balanced equation is 1 to 2.

∴ the moles of NH₃ = moles of N₂ × 2

                                =  3 moles × 2

                                = 6 moles

what is the main precaution to take if a gas cylinder sign is present in the lab?

Answers

Answer:

This symbol indicates that hazardous products with this pictogram are gases that are contained in a receptacle under pressure, or which are liquefied or liquefied and refrigerated. The hazards presented by these products are related to the high pressure or cold temperatures.

Hazardous products with this pictogram can be safely worked with if proper storage and handling practices are followed.

Credited to https://www.ccohs.ca/oshanswers/chemicals/howto/gas_cylinder.html#:~:text=The%20symbol%20within%20the%20pictogram%20is%20a%20gas,related%20to%20the%20high%20pressure%20or%20cold%20temperatures.

HAve a great day!

The main precaution to take if a gas cylinder sign is present in the lab is Check sure the gas cylinder remains constrained visually, but remain a good distance from it.

What is gas cylinder?

A gas cylinder is indeed a pressure vessel used to store and confine gases at pressures higher than atmospheric pressure. Bottles are another name for high-pressure gas cylinders.

Based on the physical properties of the contents, the held contents may be compressed gas, vapour over liquid, working fluid, as well as dissolved in a substratum inside the cylinder.  The main precaution to take if a gas cylinder sign is present in the lab is Check sure the gas cylinder remains constrained visually, but remain a good distance from it.

Therefore, the precaution is to Check sure the gas cylinder remains constrained visually, but remain a good distance from it.

To know more about gas cylinder, here:

https://brainly.com/question/17426723

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Which substance can not be broken down by a chemical change?

Answers

Answer:

Among the given substances, the one that cannot be broken down by a chemical change is arsenic.

Explanation:

Rawr

Answer:

the substances that cannot be broken down by a chemical change is arsenic.

Select all the statements that are TRUE about igneous rocks:

Answers

Answer:

Intrusive rocks are formed by slow cooling lava/magma.

Igneous rocks are always formed from lava/magma.

Explanation:

29. Which type of orbital is shown?

Z

Y

Х

Answers

Answer:

b

Explanation:

which is the largest atom in group IV?

Answers

Answer:

A

Explanation:

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which method is used to separate salt form salt solution

Answers

Explanation:

As we know, salt and water have different boiling points. Hence, we can use the "evaporation" technique to separate salt from salt solution. For this, one has to simply heat the salt solution till all the water boils and evaporates, and salt is left behind.

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.
Which of the following describes Pluto?
1. asteroid
2. moon
3. planet
4. dwarf planet

Answers

Answer:

4. dwarf planet

Explanation:

The answer is a dwarf planet.

only_________are involved in forming chemical bonds betwen two atoms
a. s orbital electrons
b. p orbital electrons
c. valence electrons
d. innermost electrons

Answers

Answer:

c. valence electrons

Explanation:

how would the rate of diffusion change if the po2 in the capillaries was 40 mmhg and the po2 in the muscle cell changed from 40 to 20 mmhg?

Answers

The rate of diffusion change would increase if the PO₂ in the capillaries was 40 mmHg and the PO₂ in the muscle cell changed from 40 to 20 mmHg.

Simple diffusion is the movement of molecular substances from a region of higher concentration to lower concentration. The mechanism with which the movement of O₂ travels from the blood to the body tissues takes place with the use of simple diffusion.

Now, if PO₂ changes from 40 → 20 mmHg in the muscle cells, and the PO₂ in the blood = 40mmHg. It implies that the pressure gradient(P) has increased. As such, there is an increase in the rate of diffusion of oxygen from the blood to muscle cells.

Learn more about diffusion here:

https://brainly.com/question/14392880?referrer=searchResults

what happens when chocolate get heated?

Answers

well the chocolate will be melt

hope it helps

CAN SOMEONE HELP IT WOULD MEAN THE MOST??!!!

Answers

Where’s the question bro??

How many moles of Oz would be required to generate 13.0 mol of NO2
in the reaction below assuming the reaction has only 74.1% yield?
2 NO (g) + O2 (g) → 2 NO2 (g)

Answers

Answer:32

Explanation:

Have a nice day :)

Select the correct answer.
Which is true with respect to the kinetic energy of a molecule?
ОА.
it is the lowest at low temperatures
OB.
it increases at low temperatures
Oc it is the same at all temperatures
OD. it is the lowest at high temperatures

Answers

Answer is A. It is the lowest at low temperature

PLSSS HELP MEEE ASAPA!!

Which pair of elements has reactivity that is similar to Fluorine, F?

Answers

Answer:

halogens group 7A on the periodic

table

pls help i will give brainliest :)))) love youuuu

Answers

Answer:

i think the answer is C

Explanation:

if wrong im sorry

What makes a charged object attract an uncharged object?

The charge in both objects move around.

The charged object is positively charged.

The charges move in the uncharged object.

The uncharged object becomes negatively charged.

Answers

Answer:

its c I think C)

 

The reason for this is due to the phenomenon called "Charging by Induction". What that means is that when something with a charge, for example a negative charge, is brought near an uncharged one, it induces the opposite charge onto it (positive in this case) and therefore since opposites attract, it attracts it.

The reason for this is that since, just like a positive magnet rejects and pushed away like charges, the electrons hold a negative charge, they push away any electrons that may be in the neutrally charged item causing only protons to be left, thus creating an oppositely charged object. Or vice versa.

So whatever charge the object has, it induces the opposite charge into the uncharged object, causing the charges to move only in the uncharged one.

Explanation:

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Can someone pls help me :(( tysm if u do and i have 7 khan academys and there only 4 questions on each on can someone pls help me on them there all due by 12 tn and i dont know who else to ask for help tysm if u do:c Please answer this for me Read the poem "If We Must Die" by Claude McKay.If we must die let it not be like hogsHunted and penned in an inglorious spot,While round us bark the mad and hungry dogs,Making their mock at our accursed lot.If we must die-oh, let us nobly die,So that our precious blood may not be shedIn vain; then even the monsters we defyShall be constrained to honor us though dead!Oh, Kinsmen! We must meet the common foe;Though far outnumbered, let us still be brave,And for their thousand blows deal one death-blow!What though before us lies the open grave?Like men we'll face the murderous, cowardly pack,Pressed to the wall, dying, buz-fighting back!Which best describes the speaker in this poem? PLEASE HELP ASAP I WILL GIVE BRAINLIEST AND 100pts!!!!!!!!!!!!!!!!!!!!!!!!!!he following histogram shows the number of items sold at a grocery store at various prices:Histogram titled Items Sold with Price Range on the x axis and Number of Items Sold on the y axis. Bar 1 is 0 to 2 dollars and 50 cents and has a height of 2. Bar 2 is 2 dollars and 51 cents to 5 dollars and has a height of 4. Bar 3 is 5 dollars and 1 cent to 7 dollars and 50 cents and has a height of 0. Bar 4 is 7 dollars and 51 cents to 10 dollars and has a height of 1.Which of the following data sets is represented in the histogram? {0.50, 2.00, 2.52, 3.37, 4.53, 5.00, 8.99} {2, 4, 0, 1} {2.50, 2.51, 5.00, 5.01, 7.50, 9.00, 10.00} {0.50, 2.50, 2.50, 5.00, 5.00, 5.00, 7.51} 16. John's daily income is $120. His daily income is 20% more than Michael's daily income. What is Michael'sdaily income?Plz send step by step explanation Will mark as a brainiest the crowd was in a large number of numbers I WILL GIVE BRAINLIEST!!!!! THIS IS UP FOR THE MOST AMOUNT OF POINTS POSSIBLE!!!!!!!! ANY FALSE ANSWERS OR LINKS WILL BE REPORTED!!!!! PLEASE HELP ME!!!!!!!!!!Louise is a marketing administrator at a financial institution. She has spent most of her busy day in meetings. She had a long department team meeting during the first half of the day. After lunch, she had a cross-departmental team meeting, followed by an administrative team meeting.A. What type of employees were likely present at each of the three meetings? Provide an example of what each meeting might have been about.B. Louise was assigned as team leader of the cross-departmental team. Since the team involves individuals who are all quite different, what kind of group dynamics should Louise watch out for? What can she do to ensure the team stays productive and motivated? Gravitational potential energy is just one type of stored energy.t or f?? How was Mexico's struggle for independence similar to and different from the founding of the United States? John Dalton thought that atoms1. Cannot be broken down further2. Have no mass3. Contain molecules 4. Are all composed of carbon A commercial shows a famous celebrity encouraging herfans to vote for a specific political candidate. What type ofpropaganda is being used in this commercial?Please help Plz help I need help please help me asap if you can! Which combination of information is most useful to public-health officials?incidence and surveillanceprevalence and surveillanceprevalence and incidencebias and prevalence 7. A fundraising group charges $0.25 per cookie and has a daily expense of $18. Which of thefollowing describes the steps that need to be taken, in order to calculate the daily profit,when selling 49 cookies? Please just tell me how to answer it not the answer She did not go to the park. It was too late inthe evening. (for) What is the vertex form of the function: f(x) = -12x - 6x^2- 13? Express 1.07 into percentage Can someone tell me if my sentences are correct and if they're in the right tense? (present progressive) please!!!need an answer asap!will give brainliest