Naturally occurring rubidium consists of just two isotopes. One of the isotopes consists of atoms having a mass of 84.912 amu; the other of 86.901 amu. What is the percent natural abundance of the heavier isotope

Answers

Answer 1

Answer:

The percent natural abundance is 27.95% for the heavier isotope (86.901 amu)

Explanation:

The atomic mass of Rubidium (Rb) is 85.468.

To find the percent natural abundance, first we need to use the following equation:

84.912x + 86.901(1-x) = 85.468

x represents the percent natural abundance, in basic decimal form

In order to find x, we will use the distributive property, combine like terms and then move the constant to the other side to get x.

We are first finding the percent natural abundance of the first isotope to make this easier for us.

84.912x + 86.901(1-x) = 85.468

-> 84.912x + 86.901- 86.901x = 85.468

-> 86.901 - 1.989x  = 85.458      (like terms were combined)

-> Subtract both sides by 86.901

-> Divide both sides by-1.989x

x = 0.720462544

Now turn this into a percent by multiplying by 100.

--> 72.05% for the first isotope (the one that contains 84.912 amu)

To find the natural abundance of the other isotope (the denser, heavier isotope), you could just subtract 72.05 from 100 to save time, but the usually desired way (the way that your teacher would probably want you to do) is down below:

We plug this decimal for the x-value into the parentheses from earlier:

(1 -x) ---> ( 1 - 0.720462544 ) = 0.279537456

Now we just need to convert this to a percent by multiplying by 100

0.279537456 * 100 = 27.95% of the heavier isotope (86.901 amu)


Related Questions

(2k-1)²
what the answer pls.​

Answers

Answer:

4k^2-4k+1

Explanation:

Plx give brainlyest

what are two ways that substances can pass through a cell membrane out of the cell

Answers

Answer:

Passive transport, and Active transport

Explanation:

Do u need an explanation?

If so you can tell me and I'll edit it

Hope this helped a little!

Convert 12.5 km/L to mi/gal.

Answers

Answer:

29.40182

Explanation:

Compared to compounds with network structures, compounds arranged in molecules (covalent bonds) have ____________ melting points.

Answers

Explanation:

.... have lower melting points.

What energy transformation occurs when a person is running

Answers

Answer:

Kinetic Energy (Hope This Helps)

Explanation:

(Brainliest)

Answer:

Chemical energy to kinetic energy. (Arguably heat energy (thermal) because of respiration)

What is Newton's First Law known as? The Law of
____

Answers

Answer:

inertia

Explanation:

Answer:

Law of inertia, also called Newton's first law, postulate in physics that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.

Explanation:

hope it helps, please mark brainliest

A syringe with 32.0 mL contains gas at 649.0 mmHg. The plunger is pushed in and now the volume is 19.5 mL. What is the new pressure?

Answers

Answer:

1.40 atm

Explanation:

P1V1 = P2V2

P2= P1* V1/V2

P1=649.0mmHg

V1= 32.0mL

V2= 19.5mL

P2=649.0mmHg*32.0ml/19.5ml=

1065.03mmHg

To get mmHg to atm. The formula is 1atm/760mmHg

Use the answer you got in mmHg to convert into (atm), If you were asked

1065.03mmHg*(1atm/760mmHg)= 1.40atm

Which of the following correctly describes a proton? Group of answer choices Location: nucleus, contribution to mass: usually about half, charge: positive Location: nucleus, contribution to mass: virtually none, charge: positive Location: outside nucleus, contribution to mass: usually about half, charge: positive Location: nucleus, contribution to mass: usually about half, charge: none

Answers

Answer:

Location: nucleus, contribution to mass: usually about half, charge: positive

Explanation:

Protons are a part of the nuclear particles alongside the neutrons. Protons and neutrons are all together called sub-atomic particles and they share the nucleus at the center of an atom together.

Protons carry positive charges. They determine the mass of the atom alongside the neutrons. They contribute half to the mass of an atom and the other part is lies on the mass of a neutron. Neutrons do not carry any charges.

What is the volume of 2 moles of He at STP?

Answers

Answer:

STP conditions imply a temperature of 273.15 K and a pressure of 100 kPa. When tose conditions are met, 1 mole of any ideal gas will have a volume of 22.7 L. So, if 1 mole occupies a volume of 22.7 L, 2 moles will occupy a volume twice as big. Likewise, 0.5 moles will occupy half the volume 1 mole occupies. Assuming that the gas is at standard temperature and pressure (STP), one mole of any gas occupies 22.4 L . This means the number of moles of O2 is 222.4=0.089 mol .

Explanation:


If an object has a velocity of 8 m/s and
a momentum of 40 kg.m/s, what is the
mass of the object

Answers

Answer:

Explanation:

The Kinetic Energy (K.E) of an object can be calculated as:

We are given:

K.E = 480 K

Velocity of the object = v = 8 m/s

Using the values, we get:

Thus, the mass of the object will be 15 kg.

The mass of the object at the given momentum and speed is determined as 5 kg.

Momentum of the object

The momentum of the object is calculated as follows;

P = mv

where;

m is mass of the objectv is speed of the object

m = P/v

m = 40/8

m = 5 kg

Thus, the mass of the object at the given momentum and speed is determined as 5 kg.

Learn more about momentum here: https://brainly.com/question/7538238

#SPJ2

the diagrams represent the same number of particles of a gas in 2 containers D snd E, Which have different volume. the two containers are at the same temperature.

in which container will the pressure be higher ?explain your answer​

Answers

In container E, the pressure will be higher than container D

Further explanation

Given

Container with :

the same particlesthe same temperaturethe different volume

Required

The higher pressure container

Solution

Boyle's Law  stated that :

At a constant temperature, the gas volume is inversely proportional to the pressure applied  

[tex]\rm p_1V_1=p_2.V_2\\\\\dfrac{p_1}{p_2}=\dfrac{V_2}{V_1}[/tex]

From the diagram (picture), it shows that the volume of container D is greater than container E, so the pressure applied to container D will be less than the pressure applied to container E

In a covalent compound like O2, two pairs of electrons are shared between the atoms. What is the name given to a bond like this?

Answers

Explanation:

The bond is a covalent bond.

Please answer fast, shouldn't take long to do ^-^ (will give brainliest)

Which is the correct formula for iron (II) phosphate?

a. Fe2PO4

b. Fe3(PO4)2

c. Fe2PO3

d. Fe(PO4)2

e. Fe(PO3)2

Answers

Answer:

B

Explanation:

Question 11 of 32
When do scientists form a hypothesis?
A. Before they form a theory
B. After they form a theory
O C. Before they perform an experiment
D. After they perform an experiment
SUBMIT

Answers

Answer:

C

Explanation:

a hypothesis always comes first

Answer:

C

Explanation:

They form hypothesis first, then perform the experiment to test the hypothesis. After multiple experiments, they form a theory.

Thus C is correct

please give thanks by hitting that heart button :)

materials that prevent the heat to flow call​

Answers

Answer:

Materials that prevent heat to flow are known as heat insulators.

Explanation:

hope it helps! ฅ'ω'ฅ

Write the name of the covalent compound ON.

Answers

Answer:

the answer is oxygen mononitride

The element in group 4 and period 3

Answers

The three group 4 elements that occur naturally are titanium, zirconium, and hafnium. The first three members of the group share similar properties; all three are hard refractory metals under standard conditions.

Which of the following steps will slow down the reaction between coal and oxygen?

Answers

Answer:

decrease temperature of the oxygen

Explanation:

Answer: I believe it it decrease temp of oxygen

Explanation:

What is a transform boundary, and how does it affect the land?

Answers

Answer:

simple

Explanation:

A transform fault or transform boundary is a fault along a plate boundary where the motion is predominantly horizontal.[1] It ends abruptly where it connects to another plate boundary, either another transform, a spreading ridge, or a subduction zone.[2]

What is an example of a congenital disorder

Answers

Answer:

down syndrome

Explanation:

2. How many moles are found in 3.2 x 1023 atoms of NaCl?​

Answers

Answer:

0.53 mol NaCl

General Formulas and Concepts:

Chemistry - Atomic Structure

Using Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

Explanation:

Step 1: Define

3.2 × 10²³ atoms NaCl

Step 2: Identify Conversions

Avogadro's number

Step 3: Convert

[tex]3.2 \cdot 10^{23} \ atoms \ NaCl(\frac{1 \ mol \ NaCl}{6.022 \cdot 10^{23} \ atoms \ NaCl} )[/tex] = 0.531385 mol NaCl

Step 4: Check

We are given 2 sig figs. Follow sig fig rules and round.

0.531385 mol NaCl ≈ 0.53 mol NaCl

Which of the following students best describes an element?

Answers

I can’t see anything particularly. Can you repost the same question but add a picture that best represents this problem? It would really help a lot for you and myself. Anyway happy holidays and have a wonderful rest of your day.

Answer:

I dont see anything.

Explanation:

But an element is a substance that is made only out of one atom.

find the pOH of a solution made by dissolving 10.4g of HCl in a 500mL solution of water

Answers

The pOH of a solution : 13.756

Further explanation

Mass HCl=10.4 g

mol HCl (MW=36.5 g/mol) :

[tex]\tt mol=\dfrac{mass}{MW}=\dfrac{10.4}{36.5}=0.285[/tex]

Volume of HCl = 500 ml = 0.5 L

[tex]\tt M=\dfrac{n}{V}\\\\M=\dfrac{0.285}{0.5}=0.57~M[/tex]

HCl ⇒ H⁺ + Cl⁻

[H⁺]=[HCl]=0.57 M

pH= - log[H⁺]

pH=-log[0.57]=0.244

pH+pOH=14

pOH=14-0.244

pOH=13.756

Pb(SO4)2 + 4 LiNO3 → Pb(NO3)4 + 2 Li2SO4
If 2.25 moles of lead (II) sulfate are combined with 9.62 moles of lithium nitrate, how moles of lithium sulfate can be created? please help

Answers

Answer:

4.5 moles of lithium sulfate are produced.

Explanation:

Given data:

Number of moles of lead sulfate = 2.25 mol

Number of moles of lithium nitrate = 9.62 mol

Number of moles of lithium sulfate = ?

Solution:

Chemical equation:

Pb(SO₄)₂ + 4LiNO₃      →     Pb(NO₃)₄ + 2Li₂SO₄

Now we will compare the moles of lithium sulfate with lead sulfate and lithium nitrate.

                       Pb(SO₄)₂        :         Li₂SO₄

                            1                :             2

                          2.25           :          2/1×2.25 = 4.5 mol

                       LiNO₃            :             Li₂SO₄

                           4                :                2

                           9.62           :             2/4×9.62 = 4.81 mol

Pb(SO₄)₂  produces less number of moles of Li₂SO₄ thus it will act as limiting reactant and limit the yield of  Li₂SO₄.      

look.............................................

Answers

Answer:

Your answer is correct.

Explanation:

The steel paper clip would only move because it has steel in it, which is a magnetized material, plastic on the other side, is made up of polymers which are not attracted to the magnetic force, causing it not to move.

A student mixes two chemicals in a test tube. She notices that the mixture starts to bubble and the test
tube feels very warm. The student most likely concludes that the mixture is-
F. a chemical reaction that happened too quickly.
G. an endothermic reaction that absorbed thermal energy.
H. an exothermic reaction that released thermal energy.
J. not a chemical reaction.

Answers

Answer:

H. an exothermic reaction that released thermal energy.

Explanation:

The student will most conclude that this is a chemical reaction in which thermal energy is released to the environment.

Such reactions accompanied by the release of thermal energy are exothermic reactions.

In an exothermic change, heat is liberated to the surrounding. The surrounding becomes hotter at the end of the changes. For such reaction we say that enthalpy change is negative.

For endothermic reactions, heat is absorbed. At the end of the reaction, the system is cold.

99% 1H
0.8% 2H
0.2% 3H
Average Atomic Mass = [answer] amu
PLEASE HELP ME

Answers

Answer: 1.01 atomic mass units or amu

Explanation:

Please answer on paper and send a picture of the answer. thank you ​

Answers

Answer:

I dont know how to take a picture so I will just tell you the answer. The answer   is no.

Explanation:

Hope this helps.    :)      :D

What happens to the velocity of an object when balanced forces act on it?
a.
There will be no change
c.
There will be negative acceleration
b.
There will be positive acceleration
d.
Velocity will change, but not acceleration

Answers

Answer:

There will be negative acceleration.

Explanation:

I majored in Physics

Answer:

A. There will be no change

Explanation:

Velocity is defined as the directional speed of an object in motion. Balanced forces do not result in any change in motion. Thus, there would be no change in velocity.

10 points Which of these is the best example of heat transfer by radiation? *

1 point

a) A satellite is warmed by sunlight.

b) A ceiling fan cools a warm room.

c) Butter melts on warm bread.

d) Puddles of water cool a warm tile floor.​

Answers

Answer:

a) A satellite is warmed by sunlight.

Explanation:

Heat transfer by radiation mostly involves heat gain or heat loss from the Sun. In this case, Option A is the only option where sunlight is involved so it is the best example of heat transfer by radiation.

Other Questions
Y=-x+3/2 mathematics question that idk the answer to The blue jays that like to eat bread off our porch, were chased away by ourcat. An artist is creating a gigantic mobile using old cars. On one end of the mobile, a 2100 lb Plymoth is suspended 30 feet from the fulcrum. In order for the mobile to be balanced, where should the artist suspend a 1400 lb Volkswagon?a20 feet from the fulcrum b7 feet from the fulcrum c45 feet from the fulcrum don the fulcrum one who benefits himself at the cost of his country is _______ a) unpatriotic b)shameless c) destroyer d) none Please help I am bad at math and need to be somewhere soon so please help me asapThe band booster and the athletic booster clubs sell tickets for a fund-raiser. The band booster sells eight more than twice the number of tickets the athletic booster sells. The band booster club sells 280 tickets. Find the number of tickets the athletic booster club sells.A. 144 ticketsB. 132 ticketsC. 136 ticketsD. 148 tickets Please help me on circle theorems Na+ is an ion give reasons Please answer quickly will mark brainliest! PLEASE HELP 25 points Who said all animals were made of cells Planes A and B are shown.If a new line, p, is drawn parallel to line I, whichstatement is true?nVI ALine p must be drawn in plane B.O Line p must be perpendicular to line m.Line p must be drawn so that it can lie in the sameplane as linel.O Line p must be drawn in the same plane as line n.m Which of the following statements about maintaining a fitness program is TRUE?A.Progress is always steady.B.Varying exercise types helps improve the likelihood of maintaining a program successfully.C.Exercising with a partner can be fun, but does not improve the likelihood of maintaining a fitness program.D.Starting off an exercise program at a high level of intensity is advisable to improve the chances of success. how please help me computer A football quarterback throws a football for a long pass. While in the motion of throwing, the quarterback moves the ball , starting from rest, and completes the motion in . Assuming the acceleration is constant, what force does the quarterback apply to the ball during the pass Which must be true select three options REM sleep is called paradoxical sleep because a. our heart rate is slow and steady, while our breathing is highly irregular b. we are deeply asleep but can be awakened easily c. our nervous system is highly active, while our voluntary muscles hardly move d. it leads to highly imaginative dreams that are perceived as colorless images (Ill give brainliest) The story this sentence is in A Christmas Carol Okay so A im ticked off at the fact that I can never get any help on this site B don't answer if you are gonna say something that makes no sense and C please help me....I'm begging you. What is an example of religion that has to do with sycretism? i have to make an infographic for my aphug class and I am stuck so please help me...this is all I've got so far What does making a good decision mean?? How can I make a good decision? True or False: One reason that Prohibition was ended in the early 1930s was the loss of tax revenue from the legal sale of alcohol.