calculate the atomic mass of carbon if the two common isotopes of carbon have masses of 12.000 amu (98.89% abundance) and 13.003 amu (1.11% abundance)

Answers

Answer 1

12.01 amu

Work:

(12.000 × .9889) + (13.003 × .0111) = 12.01

turn the precents into decimals


Related Questions


It is found that after 24!hours 1/8 of the mass of a sample of a radio-active isotope remains What is the half-life of this isotope?

Answers

Answer:7.72 years

Nuclear half-life expresses the time required for half of a sample to undergo radioactive decay.

Explanation:

0.01 = 67.0 ×[tex](\frac{1}{2}) ^{\frac{98.0} {1/2 } }[/tex] [tex]\frac{0.01}{67.0}[/tex] = 0.000149=[tex](\frac{1}{2}) ^{\frac{98.0} {1/2 } }[/tex]

[tex]^{\frac{98.0} {1/2 } }[/tex] =log[tex]_{0.5}[/tex] (0.000149)=12.7

[tex]^{\frac{98.0} {1/2 } }[/tex]=7.72 years

Hope this helps have a great day/afternoon :)

Wear lightweight clothes in the_____. not sun or summer and is it heat

Answers

Answer:

there was too much heat

Explanation:

Which particle changes to create a positive or negative ion of an atom?
A.proton
B. neutron
C. electron

Answers

Answer:

it is alkali

Explanation:

hope it helps you

The answer is Neutron, a proton keeps a positive charge and never changes unless it dies out, same thing fir a electron. An electron keeps an negative charge. A neutron is neutral it is neither a proton or an electron. But it can change if needed to.

Is the freezing point of this 5??
Please correct my mistake if it isn't.

Answers

Answer:

yes

Explanation:

Answer:

yes

Explanation:

you're smart have a nice evening

why is diamond said to be hard

Answers

Answer: Diamond is said to be the hardest element because it is unbreakable by humans. These diamonds are mined, and they are very hard. A miner knows when they have found diamond when they feel something super hard.

Hope this helps you!

2) A student was working on an investigation to measure the relative activity
of an enzyme at various pH values. He collected the following data:
pH 2, enzyme activity 10; pH 8, enzyme activity 50;
pH 12, enzyme activity 10; pH 4, enzyme activity 20;
pH 6, enzyme activity 40; pH 10, enzyme activity 40

Answers

Answer:

THE LAST ONE

Explanation:

Explain why you cannot use a pump like the one at the right to
lift water up to the 3rd floor of an apartment building.

Answers

Answer:

can you aks it more clerlry

Explanation:

What type of reaction is the equation 2NaCl → 2Na +Cl2?

Answers

Answer:

Synthesis reaction

Explanation:

This is a synthesis reaction. When you combine sodium metal (Na) with chlorine gas (Cl), you form sodium chloride or kosher salt (NaCl).

Hope this explanation helps!

Please answer correctly !!!!!!!!!!!!!!!!! Will mark brainliest !!!!!!!!!!!!!!!! And explain please !!!!!!!!!!!!

Answers

Copper(II) chloride is a blue-green solid. When placed in water, the crystals turn bright green with a slight blue tinge in the water above the crystals. When stirred, the crystals dissolve and form a light blue solution

Hope this is your answer i wasn't able to see he full question so i am not sure

Is the following an element, compound, homogeneous mixture, or heterogeneous mixture?

Coca-cola

Answers

Answer:

CO2 is classified as a compound

Explanation:

The capability of a substance to be stretched into thin wires without breaking is known as —
A malleability
B conductivity
C luster
D ductility

Answers

the answer is ductility

Answer:

The answer is D, ductility

Explanation:

The definition of ductile is "(of a metal) able to be drawn out into a thin wire."

12. A 100.00-gram sample of naturally occurring boron
contains 19.78 grams of boron-10 (atomic mass =
10.01 atomic mass units) and 80.22 grams of
boron-11 (atomic mass = 11.01 atomic mass units).
Which numerical setup can be used to determine the
atomic mass of naturally occurring boron?
A) (0.1978)(10.01) + (0.8022)(11.01)
B) (0.8022)(10.01) + (0.1978)(11.01)
C) (0.1978)(10.01)/(0.8022)(11.01)
D) (0.8022)(10.01)/(0.1978)(11.01)

Answers

It’s A) (0.1978)(10.01) + (0.8022)(11.01)

Relative and average atomic mass both describe properties of an element related to its different isotopes. Out of these two Relative atomic mas is more accurate. Therefore option A is correct option.

What is mass?

Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.

Mathematically,

average atomic mass=  ∑(relative abundance x mass of isotope)

average atomic mass boron= (relative abundance boron-10  x mass of isotope boron-10)+(relative abundance boron-11  x mass of isotope boron-11 )

average atomic mass boron=(0.1978)(10.01) + (0.8022)(11.01)

Therefore option A is correct option.

To learn more about mass, here:

https://brainly.com/question/28704035

#SPJ2

5. an atom that has lost or gained an electron and has become charged
A.ion
B. proton
C. ionic bond
D. compound

Answers

Answer:

It would be compound.

Explanation:

It is this way because if it adds another proton it becomes more positive that nuetral, and if you add an electron it just makes the atom more dense. That is why the answer is compound. Hope this helped :)

Why the noble gases are found in small amounts in the earth's atmosphere?

Answers

Answer:

They have completely filled outermost shell

Explanation:

The noble gases are the rarest and occur in trace amounts in the atmosphere because they have completely filled outermost and this makes them unreactive with other elements.

Elements become abundant as they combine with other species to form compounds.

Noble gases on the other hand have a high level of stability and do not readily combine with other species.

Some of these gases are :

        Helium

        Neon

        Argon

        Krypton

        Xenon

       Radon

They have very high ionization energy and very low electron affinity and so will not readily react.

A hypothesis is ______ to explain a set of observations.

1 one possible way
2 the correct method
3 a factual statement
4 a set of data ​

Answers

Answer:

1

Explanation:

one possible way its just a theory of what the answer could be

Answer:

3-a factual statement

Explanation:

A hypothesis is a factual statement to explain a set of observations.

PLEASE ANSWER
A train travels 200 miles at an average speed of 50 miles per hour. How long does it take the train to travel this distance?

Answers

4 hours. Divide 200 by 50

8. What is Planck's law?
O F = hm
O F = MA
O E = hf
O E = mc (squared)

Answers

Answer:

O E = hf

Explanation:

Why is hydrogen peroxide sold in opaque plastic bottles?

Answers

it's not a very stable compound

19. Who was the first female astronomer

A.Aristotle
B.En Hedu’Anna
C.Archimedes
D.Plato

Answers

Answer: A.En Hedu'Anna

Answer:

En Hedu’Anna!

Explanation:

what acts as a buffer for seawater ?

Answers

Answer:

The bicarbonate and carbonate ions.

Explanation:

Probably not he answer your looking for though. So, CO2.

Bicarbonate hope this helps

during chemical reaction do atoms change into a new substance
true or false

Answers

Answer:

t

Explanation:

because for atoms to change they have to have some kind of chemical action to get new life

True


Because of chemical action
Hope it helped you

which of the following molecules has only two non binding pairs (long pairs) of electrons in its lewis structure?

a)O2
b)CH4
c)NH3
d)H2s

Answers

Explanation:

NH₃ has only two non-binding pairs (lone pairs) of e⁻ in it's Lewis structure.

••

H—N—H

|

H

Therefore,

C is correct. ✔

Using the em figure what color is the wavelength 436 nm

Answers

Answer:

Blue

Explanation:

Explain what intermolecular forces are, and how they are easily overcome.

Answers

Explanation:

Intermolecular forces are forces that exist between two or more molecules and they can be overcome at high temperatures.

How many grams are in 1.98 x 1024 formula units of NaCl?

Answers

Answer:

There are 2027.52 formula units of NaCl

Explanation:

plz mark me brainlest

The maximum amount of statie friction between this chair
and the floor is 175 N.
Which action would cause the chair to move to the left?
A. Applying 100 N of force to the chair from the left
B. Applying 200 N of force to the chair from the left
O c. Applying 200 N of force to the chair from the right
O D. Applying 100 N of force to the chair from the right

Answers

In order to overcome static friction, a force greater than 175 N would need to be applied to the chair, so we can eliminate A and D. Since you want to move the chair to the left, you’d have to push from the right, so the correct answer is
C) applying 200 N of force to the chair from the right

Answer:

C

Explanation:

A p ex

The main goal of science is to

Answers

Answer:

The goal of science is to learn how nature works by observing the natural and physical world, and to understand this world through research and experimentation.

Explanation:

Between Na and Na+ which has larger size​

Answers

Answer:

Na+ is smaller than Na because, it has given away one electron because of which the electron shielding gets stronger due to more protons and less electrons. Whereas, Cl- is larger than Cl because it has gained an extra electron and so, the no.07‏/12‏/2010

Explanation:

Snakes and similar animals are members of a group called reptiles.

How do reptiles differ from other animals?

Answers

Answer:

They have skin covered with scales.

TIME REMAINING
58:36
The electron configuration for Helium (He) is shown below.

1s2

Which diagram shows the correct distribution of electrons in the electron shells of a helium atom?

Answers

Answer:

'*:*'

Explanation:

I know this looks weird, but

'= electron

*:* equals the nucleus, so 2 protons and 2 neutrons

and then '=electron

Other Questions
Fiften is 30 percent of what number? Why in the crusades would so many people be executed at once? True or false - please hurry Which of the following individuals are likely to qualify for a special enrollment period (SEP) for either a MA and/or Part D due to a change of residence?I. Edward (enrolled in MA and Part D) moves to a new home within the same neighborhood in his existing plans service area.II. Fiona (enrolled in MA and Part D) moves cross-country to an area outside her existing plans service area.III. Gilbert moves into a plan service area where there is now a Part D plan available to him from a service area where no Part D plan was available. IV. Henry makes a permanent move to a new state providing him with new MA and Part D options.CHOICES:a. II and III only b. I and II only c. II, III, and IV only The order in which you multiply inverse matrices is not relevant.TrueFalse Your ASL teacher is actually a witch!One day, she gets tired of you not paying attention and zaps you into novel.Which novel/story would you hope she zapped you into and why? 3. The country of Denmark is ruled by what type of government? (1 point)O democracyO monarchyO dictatorshipO totalitarian if scientists want to solve an environmental problem they are most likely to use ? Which graph represents an event function? Each of the four independent situations below describes a sales-type lease in which annual lease payments of $120,000 are payable at the beginning of each year. Each is a finance lease for the lessee. (FV of $1, PV of $1, FVA of $1, PVA of S1, FVAD of $1 and PVAD of (Use appropriate factor(s) from the tables provided.)Situation 1 2 3 4Lease term (years) 9 9 10 10Lessor's and lessee's interest rate 11$ 13$ 12% 12%Residual value: Estimated fair value 0 $54,000 $8,400 $54,000Guaranteed by lessee 0 0 $8/,400 $64,000Determine the following amounts at the beginning of the lease Round your intermediate and final answer to the nearest whole dollar amount. Answer the missing part.Situation 1 2 3 4A. The lessor's: 1. Lease payments $1,080,000 $1,080,000 $1,200,000 ________2. Gross investment in the leas $1,080,000 $134,000,000 $1,208,400 1,264,0003. Net Investment in the lease 737,534 713,828 762,095 779,996B. The lessee's 4. Lease payments 1,080,000 1,080,000 1,200,000 ________5. Right-of-use asset 737,534 713,828 759,390 ________6. Lease payable 737,534 713,828 759,390 ________ Which word in the sentences is a synonym for worthwhile? A person has trouble coordinating muscle movements. Which two tissues could be injured? Which set of numbers could represent the lengths of the sides of a triangle? Question 3 What is the slope of the line that passes through the points (0.-7) and (-4, 3)? 0 -3/11 O -2/5 O -5/2 0 10/4 Question 4 How does Mary react when coming home to her husbands body Infer Why is a mechanism needed to remove carbondioxide gas from your cells? 15+3x=45 I'm sorry but there will be a lot of questions I need to ask. But can someone help me with this one too? A change in body temperature will have which of the following effects on enzymes in the body? A. A temporary change in the ability of some enzymes to bind with their coenzymes B. A temporary change in the ability of some enzymes to bind with their substrate C. A temporary reduction in the concentration of some enzymes in the body D. A temporary increase in the concentration of some enzymes in the bodyPls help. I think its either C or D idk and the question is worth a lot of points :( What is a semi colon used for? How is iodine 131 similar to a normal atom of iodine?