How many atoms are in 80.45g of magnesium

Answers

Answer 1

Answer:

see below

Explanation:

1. 1 mol Mg = 24.31 g = 6.02 *10^23 atoms

     calculate the number of atomsin 80.45g Mg

         Numberof atoms = 6.02*10^23 Mg atoms / 24.31 g * 80.45 g

                                    = 1.99*10^24 atoms

2.1 mol C-12 = 12.01g = 6.02 * 10^23 atoms

    calculate the mass using

                                       = 12.01 g C / 6.02*10^23 atoms * 100 atoms

                                       = 1.99 * 10^-21 g

Answer 2

Answer:

1.9926 * 10 ^24 

Explanation:

Molar Mass - Use Periodic table!

M ( Mg ) = 24.31 g / mole

n = 80.45 g : 24.31 g/mole = 3.31 moles

N a ( Avogadro`s constant ) = 6.02 * 10 ^23

N = Na * n = 6.02 * 10 ^24 * 3.31 = 19.926 * 10 ^23


Related Questions

one liter of gas has a pressure of 150.00kPa at 25 degrees celcius. if the pressure increases to 600.kPa and the temperature to 100.0 degrees celcius, what would be the new volume of the gas

Answers

Answer:

0.313 liters

Explanation:

You want to use the Combined Gas Law Equation: (P1*V1)/(n1*T1)=(P2*V2)/(n2*T2). You then want to cross off things that don't change, so moles(n) in this example. Then convert the temperature to Kelvin (always), and solve algebraically.

BEBE
It is believed the major reason for the decline in amphibian species is
a. death through disease
b. changing reproductive habits
mutation
d. climate change
C.
Please select the best answer from the choices provided


Answers

Answer:

Climate change is the answer

Explanation:

They have to adapt and if the climate changes they no longer can

Answer:

climate change

Explanation:

edge 2022

4. When a turbine spins, it generates electrical energy and that is where it gets its name from.

Answers

if it’s hydraulic turbine then it’s potential and kinetic energy and if it’s a thermal process then heat energy from the fuel burnt runs the turbine

I need help with stoichiometry

Answers

Um I don’t know what stoichiometry is. So I can’t help I am sorry wish I could

What is the excess reactant of water?

Answers

Answer:

Hydrogen

Explanation:

An example of this can be In this example, hydrogen is the limiting reagent and oxygen is the excess reagent. The amount of product formed is limited by the amount of hydrogen.

What mass of sugar and water is needed to make 40 g of 10% solution?​

Answers

Answer:16g

Explanation:A solution's percent concentration by mass,

% w/w

, basically tells you what mass of solute you get per

100 g

of solution.

The diagram shows Earth's position in its orbit around the Sun at the beginning of each season

Which position of Earth shows the Moon located where its shadow may sometimes reach Earth?

Answers

The position where the moon is located where its shadow may sometimes reach Earth is position A .

What is an eclipse?

We know that in the outer space there are a lot of celestial bodies that can be found. Now we know that a celestial body is one that can be found in the outer space and the moon and the sun are all parts of the celestial bodies that we can find in the solar system.

In this case we  are being asked for the position of the moon that could lead to an eclipse where the moon would come between the earth and the sun and that is the position A.

Learn more about eclipse:https://brainly.com/question/4279342

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What for a neutral element is [Kr] 4d8 5s2 ?

Answers

Answer:

1.Hydrogen: 1s1 2 - Helium: 1s2

45 – Rhodium: [Kr], 5s2, 4d7 46 – Palladium: [Kr], 5s2, 4d8

47 – Silver: [Kr], 5s2, 4d9 48 – Cadmium: [Kr], 5s2, 4d10

49 – Indium: [Kr], 5s2, 4d10, 5p1 50 – Tin: [Kr], 5s2, 4d10, 5p2

Thus 43 electrons, so the neutral atom has atomic number 43. Look at a periodic table and you see that this element is technetium.

Element Atomic Number Element Symbol Element Electron Configuration

45 Rh [Kr] 4d8 5s1

46 Pd [Kr] 4d10

47 Ag [Kr] 4d10 5s1

48 Cd [Kr] 4d10 5s2

How many molecules are present in 2.00 mol of KCl?

Answers

Answer:

The question specified 2 moles of potassium chloride. Clearly, there are 2 moles of chloride ions. How many moles of chloride ions in 95.2 g

How long does it take an object to travel 50m at a rate of 8 m/s?

Answers

Answer:

6.25s

Explanation:

time = distance / speed

time = 50 / 8

time = 6.25s

Describe in short about the paper chromatography. ​

Answers

Answer:

Paper chromatography is a method used to distinguish or separate coloured substance mixtures.

In the image, take an example of colured chemical placed in a glass beaker. If a paper is placed in that chemical, coloured spots are separated and displayed on the chromatogram.

It was founded in 1944 A.D by a scientist called Erwin Cargaff.

Where do properties of matter come from?

Answers

Answer:

Extensive or inextinsive and either physical or chemical

what is the heaviest element on the periodic table

Answers

Answer:

uranium

Explanation:

The heaviest naturally stable element is uranium, but over the years physicists have used accelerators to synthesize larger, heavier elements. In 2006, physicists in the United States and Russia created element 118.

Answer:

Uranium

Explanation:

Naturally its uranium, however scientists are artificially making bigger ones (which aren't on the periodic table).

Hope this helps!

PLEASE HELP CHEMISTRY

What is the hydronium ion concentration of a solution with a POH of 6.90?
O 6.29 x 10-7 M
6.53 x 10-7 M.
O 7.18 x 10-8 M
O 7.94 x 10-8 M

Answers

Answer:

O 7.94 x 10-8 M

Explanation:

Did the test

The hydronium ion concentration of a solution with a pOH of 6.90 is 7.94 × 10⁻⁸ M.

What is the relation between pH & pOH?

Relation between the pH and pOH will be represented by the below equation as:

pH + pOH = 14

Given that pOH = 6.90

So, pH = 14 - 6.90 = 7.1

Also we know that, pH = -log[H⁺]

[H⁺] = [tex]10^{-pH}[/tex]

[H⁺] = [tex]10^{-7.1}[/tex]M

[H⁺] = 7.94 × 10⁻⁸ M

Hence the concentration of hydronium ion is [tex]10^{-7.1}[/tex] M.

To know more about pH & pOH, visit the below link:

https://brainly.com/question/17144456

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which blue and violet gemstone is used as the birthstone for december?

Answers

Answer:

Tanzanite

Explanation:

Tanzanite is the exquisite blue-purple variety of the mineral zoisite that is only found in one part of the world. Named for its limited geographic origin in Tanzania, tanzanite has quickly risen to popularity since its relatively recent discovery.

What type of volcano is formed at a weak spot in the middle of a plate?
a.
lava
c.
hot spot
b.
fault
d.
plate

Answers

Hot spot volcano is the type of volcano which is formed at a weak spot in

the middle of a plate.

Hot spot volcano is an area in the Earth crust which is characterized by large

amount of heat flow in the area due to the volcanic activity. Hot spot  

volcano is formed at the middle of the plate as against junctures in which

other types are formed.

The weak spot is what gives rise to the unusual heat flow which makes hot

spot volcano most appropriate.

Read more about Hotspot volcano on https://brainly.com/question/264008

What is the difference between an element, compound, and a mixture

Answers

Answer:

Element: Pure substance consisting of one type of atom. Compound: Pure substance consisting of two or more different atoms. Mixture: Two or more different substances not chemically combined.

Explanation:

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please help me on this question plizzźzz

what is the green colouring matter found in plants called​

Answers

Answer:

the answer is chlorophyll....

Explanation:

if u need it's purpose just let me know

Explanation:

the green colouring matter found in plants is called chlorophyll.

why do atoms get smaller as you move across a period

Answers

Neutral atoms get smaller as you move across the periodic table from (left to right) because the atom increases in electrons. The more electrons, the bigger the effective nuclear charge (electron and proton attraction) and so basically the atom shrinks.

Anyone pls help me with science

Answers

Answer:

50% pups have solid fur

50%, pups haven't solidfur

2. DOMINANT FF IS NOT POSSIBLE

How is a chemical equation different from mathematical equation?
Only chemical equation uses + sign
Only chemical equation uses arrow instead of = sign
Only chemical equation has numbers
Only chemical equation has minuses

Answers

Answer:

Only chemical equation uses arrow instead of = sign

Answer:

Only chemical equation uses an arrow instead of a = sign.

A chemical equation depicts a chemical reaction by utilising chemical formulae and symbols to depict the reactants, products, and chemical changes that take place. In a chemical equation, the arrow indicates the direction of the reaction and is commonly depicted as a single arrow pointing from the reactants to the products. In contrast, the equals sign (=) is commonly used in mathematical equations to indicate that two expressions have the same value.

While numbers are used to indicate the relative proportions of reactants and products and minus signs are used to indicate reactants or products in the form of ions, the arrow is the most distinguishing feature that distinguishes chemical equations from mathematical equations.

Evaluate: (12)2 ×102 −6.3 ÷2.1


21.4 A


22 B


9.3 C


75 D HELP PLS

Answers

Answer:

answer is 2,445..or B as its noted

Under what conditions do you expect hydrogen gas to deviate from ideal gas behavior? Explain your answer.

Answers

Hydrogen is a non-polar gas with very weak intermolecular forces of attraction. Hydrogen will deviate from the ideal gas behavior at high pressure.

Which gas makes your voice deeper or has the opposite effect on you than helium when you inhale it.

Answers

The correct answer is Sulfur Hexafluoride
it’s an inert gas that is known to be six times heavier than the air we breathe. While Helium being lighter makes our voice higher, SF6 makes our voice deeper. The sound travels slower in denser gases which is why our voice will come out deeper and rather slow.

Answer:

Sulfur hexafluoride

Explanation:

It is heavier than air that we breathe so it has an opposite effect.

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1. Why are the world’s rainforests so important?




2. Predict solutions for slowing the loss of biodiversity.



3. Describe three ways humans are contributing to the loss of biodiversity.





4. How does the introduction of invasive, non-native species, threaten biodiversity?

Answers

Answer:

1.

Rainforests are important due to the amount of oxygen the tree's produce. It also adds biodiversity and more balance in the food chain of animals.

2.

If we slowed transportation and agricultural farming, greenhouse gases and carbon monoxide would be reduced magnificently.

3.

One way is that Humans are supplying demand for animal agriculture for food (when not need to). The greenhouse gases created by the factories alone are creating much of the ozone's destruction. Also, another reaction to demand of meat is, The space needed for farmland. They burn down much of the rainforest for farmland and grass for the cows and other animals. Thirdly, traveling alone and having many household luxuries aren't helping either. Lowering the use of composite resources and more wind, solar, and water energy can help the earth in total.

4.

Introducing invasive species endangers many of the other species. They could have a advantage or disadvantage over the other species. causing either over, or under, population for many of the species. Throwing the balance of it all off.

Jacinta wrote the following passage about chemical changes.

A chemical change is a change that results in one or more new substances with different properties. When a chemical change occurs, the new substance can give off an odor, such as rotting fruit or cookies baking in the oven. Chemical changes can cause color changes, such as iron rusting and turning a reddish-brown color. When wood is burned or ingredients are mixed for baking a cake, a new substance is made.

Choose the best statement that Jacinta can add to her passage.

Chemical changes, such as rotting fruit and burning wood, are affected by temperature. More heat and energy causes a faster chemical change.
Wood burning and fruit rotting creates new substances through a chemical change that is affected by sound energy.
Rotting fruit and burning wood is a chemical change that occurs because there is a decrease in temperature. Less heat causes a faster chemical change.
When a chemical change occurs, the new substance that is created has properties similar to the original substance.

Answers

She should add either the 3rd or fourth statement

What products are obtained by the electrolysis of CuSO4 solution using copper electrode ? Show with help of chemical reaction.​

Answers

Answer: The products will be copper and oxygen.

Explanation: Copper electorde is an active electrode so it constantly takes part in the electrolysis. Cathode is a pure copper negative electrode and anode is a impure copper positive electrode. So the copper present in the solution, along with the copper present in the anode will come off and go to the cathode. As a result, cathode gains copper. And the remaining impurities settle down in the bottom.

In the anode, oxygen will be given off because according to the order of discharge, if SO4 is present then the ions will stay in the solution and oxygen will be released. So at the end, solution of SO4 and H2O will be remaining while copper and oxygen is extracted.

The half equations are-

Cathode: Cu2+ + 2e- = Cu

Anode: Cu + 2e- = Cu2+

Something you might not know: The solution in electrolysis turns blue when copper goes to the cathode. So copper electrodes are also used in electroplating.

What is freshly pumped oil called?

Answers

Answer:

When the drill hits oil, some of the oil rises from the ground high into the air. This immediate release of oil is known as a "gusher." Once a reservoir has been located, pumps are used to extract the oil.

What is freshly pumped oil called?

petroleum

Explanation:

10. Can you write an equation to describe this?
(Investigating the pH scale)

Answers

Answer:

pH = - log [H3O+]     pOH = -log[OH-]

Explanation:

what is the number of protons in a neutral atom with 31 electrons and 38 neutrons?

Answers

31

I think. Protons and electrons share the same number as well as the atomic number.

Answer:

31 protons

Explanation:

Protons are positively charged and electrons are negatively charged so if it is a neutrally charged atom (which most are) the protons and electrons will be equal.

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