how many Aluminum atoms are in Al2O3

a. 3

b. 2

c. 5

d. 1

Answers

Answer 1

Given the data from the question, the number of aluminum atoms in aluminum oxide, Al₂O₃ is 2 (Option B)

Composition of aluminum oxide, Al₂O₃

From the formula of the compound, Al₂O₃ we see that the compound is composed of

Aluminum Oxygen

How to determine the number of aluminum atoms Formula of compound = Al₂O₃Number of oxygen atoms j= 3 × 1 = 3Number of aluminum atoms = 2 × 1 = 2

From the above, we can conclude that Al₂O₃ contains 2 atoms of aluminum.

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Related Questions

Which of the following is not an example of an inexhaustible resource?
1.) Wind power
2.) Wave and tidal power
3.) Solar energy
4.) Biomass

Answers

Solar energy because solar take more resources then all the options that are on the question Answer is 3

Answer:

I would say 4.) Biomass

Explanation:

This looks like the best possible answer because it is plant based. Worst case scenario we could run out of plants. In comparison, wind will pretty much always be around along with wave/tidal power and solar.

What is the mass in kilograms of a sample containing 2.4 x 10^{24} atoms of this element? Do not use scientific notation.

Answers

The right Answer is 0.29

An element has 25 protons and 30 neutrons. What is the correct nuclear notation for the element? Please use the Periodic Table to find the correct symbol

Answers

Answer:

It is:

55

Mn

25

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

How many oxygen atom in 0.25 mol ca(No3)2

Answers

Answer: I believe its 1 but i'm not sure

Explanation:

HELP ME OUT PLS!!!!!!!

Our earth is situated in the Milky Way galaxy. The Milky Way galaxy is which type of galaxy?

elliptical

irregular

spiral

oval​

Answers

Answer:

the spiral type of galaxy

Our earth is situated in the Milky Way galaxy. The Milky Way galaxy is a spiral galaxy. Therefore, the correct option is option C.

What is milky way galaxy?

The Milky Way constellation is indeed a huge spiral formation containing hundreds of trillions of stars, along with the Sun. the irregularly formed belt of stars and gas clouds visible from Earth that spans the sky. despite the reality that Earth is positioned within the Milky Way constellation, astronomers do not completely understand its nature, despite its proximity with other external star systems.

A dense layer of interstellar dust obscures the majority of the Galaxy from optical observatories, and astronomers can only understand its massive building with the assistance of radio and infrared telescopes, which can detect the forms of light that may travel through the obscuring material. Our earth is situated in the Milky Way galaxy. The Milky Way galaxy is a spiral galaxy.

Therefore, the correct option is option C.

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How many grams of a gas with a molar mass 36.02 g/mol would be required to occupy a 3979 mL flask at 1.07 atm and 81.7 degrees Celcius? Record your answer in scientific notation to 2 decimal spaces.

Answers

A 3979 mL flask is occupied by 5.26 g of a gas with a molar mass of 36.02 g/mol at 1.07 atm and 81.7 °C.

What is an ideal gas?

An ideal gas is that whose behavior can be explained using the ideal gas laws.

Step 1. Convert 81.7 °C to Kelvin.

We will use the following expression.

K = °C + 273.15 = 81.7 + 273.15 = 354.9 K

Step 2. Calculate the moles of the gas.

We will use the ideal gas equation.

P × V = n × R × T

n = P × V / R × T

n = 1.07 atm × 3.979 L / (0.08206 atm.L/mol.K) × 354.9 K = 0.146 mol

Step 3. Calculate the mass of the gas.

The molar mass of the gas is 36.02 g/mol.

0.146 mol × 36.02 g/mol = 5.26 g

A 3979 mL flask is occupied by 5.26 g of a gas with a molar mass of 36.02 g/mol at 1.07 atm and 81.7 °C.

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what is the oxidation number of sulphur Cr2SO4

Answers

should be Chromium(III) sulfate:  Cr₂(SO₄)₃

the oxidation number:

Cr₂(SO₄)₃ = 0

Cr = +3

SO₄ = -2

S + 4.O = -2

S + 4.-2 = -2

S = +6

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

Answers

Explanation:

It is the unit of work or energy

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.

Define, giving examples of
Binary ionic Compound:​

Answers

Answer:

A binary ionic compound contains an ion that is a metal (cation) and an ion that is a nonmetal (anion).

Explanation:

Tell me if its wrong

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:

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

Section 1
1. The Florida scrub jay is a bird found only in the scrub habitat of Central Florida. Efforts are being ma
in Florida to preserve the scrub habitat by limiting development by humans and maintaining natural
conditions. Which may occur over time if the Florida scrub habitat is NOT preserved? (SC.5. L.15.1)
A. The scrub jays may become extinct.
B. The scrub jays may move to live in a coastal habitat.
C. The scrub jays may learn to live in any habitat that replaces the scrub habitat. X
D. The scrub jays may have offspring with changed features to match a new habitat.

Answers

Answer:

i belive it is A

Explanation:

well if it olny lives in those scrub habitats and the habitats get desroyed or polluted they will no longer be habitable there fore causeing the scrub jay to go exctinct.

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

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A manufacturer advertises that a particular brand of lotion is “pH balanced” and that it has a pH equal to 6.25. What can you infer about the lotion based on the information in the ad?

Answers

We can infer about the given information of lotion is that pH is slightly acidic in nature.

What is pH?

pH of any solution gives idea about the acidity or basicity of that solution, and it will be calculated as:

pH = -log[H⁺]

pH value in the range of 0 to 6.9 shows acidity, 7 shows the neutral nature and from 7.1 to 14 shows basicity. Given pH value of lotion i.e. 6.25 states that lotion is slightly acidic in nature.

Hence pH value of lotion informs that lotion is slightly acidic.

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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

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

Answers

Answer:

Gyanendra of Nepal

betrokke, onthou qrxn = AH en onthou dat "per mol" beteken om te deel.) • In an acid-
base neutralization reaction between 50.0 mL of 0.5 M nitric acid (HNO3) and 50.0
mL of 0.5 M potassium hydroxide (KOH), Arxn was found to be -2500 J. The enthalpy
change (J) per mole of base is therefore ... (Hint: determine the relevant number of
moles of base, remember Arxn = AH and remember that "per mole" means divide.)

Answers

The enthalpy tell us about the heat that may be absorbed or evolved in a reaction. The ethalpy of this reaction is -100 kJ/mol.

What is enthalpy?

The term enthalpy deals with the heat that is absorbed or emitted in a reaction. The reaction equation is; HNO3 + KOH ----> KNO3 + H2O

Number of moles of HNO3 = 0.5 M * 50/1000 L = 0.025 moles

Number of moles of KOH= 0.5 M * 50/1000 L = 0.025 moles

Since the reaction is 1:1, then heat evolved = - (2500 J * 10^-3)/0.025 moles

= -100 kJ/mol

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What is the pH of a 0.050 M LiOH solution?

Answers

Answer:

a. <1.0

b. 1.30

c. 3.00

d. 11.00

e. 12.70

Choose all the answers that apply.

The troposphere is _____.


the warmest layer
responsible for weather and clouds
the coldest layer
warmed by the Earth's surface
the lowest layer

Answers

Answer:

The lowest layerWarmed by earth surface

Explanation:

Troposphere is the lowest layer located on atmosphere of earthIt contains all green house gases so it becomes warmed by reflection of heat from earth surface

Answer:

warmed by the Earth's surface

the lowest layer

Explanation:

If you put 5ml of coffee into 15ml of water how much was the coffee diluted

Answers

For 5ml of coffee into 15ml of water, the dilution of the coffee  is mathematically given as

X=0.25ml


What is the dilution of the coffee?

Generally, the equation for the Total volume  is mathematically given as

Tv =inital v+final volume

Therefore

Tv=5ml+15ml

Tc=20ml

In conclusion, Ther extent of diluti\on is

X=5/20ml

X=0.25ml

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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 I solve this

Answers

Answer:

try doing a math problem it may help

Explanation:

Some landforms you might see while traveling across the country could be

mountains
forests
hills
rivers
glaciers

Answers

Answer:

Mountains, Hills and Rivers

Explanation:

Because I read it and I already know that

Hope that helps!

Answer:

Mountains, Hills and Rivers

Explanation:

1. Nene geese in Hawaii are endangered because of
O pollution exotic species
O poaching
O habitat destruction​

Answers

Answer:

✔ habitat destruction

Explanation:

the 3 reasons are:

hunting

habitat loss

introduced predators

summed up its habitat destruction

PLEASE HELP 50 POINTS NO ROBOTS OR I WILL REPORT Which functional group does the molecule below contain?
H
H-C-C
H
H
O A. Ether
O B. Amino
O C. Hydroxyl
• D. Carbonyl

Answers

Answer:

D. carbonyl

Explanation:

A C=O group is present, otherwise known as a carbonyl group

Which are produced when HCl reacts with Ca(OH)2?
Cl2, H3, and CaO
CaCl and H3O
CaO, Cl2, and H2O
CaCl2 and H2O

Answers

Answer:

b did the test

Explanation:

did the test

A balanced chemical equation obeys the law of conservation of mass. The reaction of HCl with Ca(OH)₂ is a weak base - strong acid reaction. The products formed are CaCl₂ and H₂O. The correct option is D.

What is a balanced chemical equation?

A chemical equation in which the number of reactants and products on both sides of the equation are equal is defined as the balanced chemical equation. The coefficients are the numbers which are added to balance the chemical equation.

The balanced equation for the reaction of HCl with Ca(OH)₂ is given as:

Ca (OH)₂ (s) + 2HCl (aq) → CaCl₂ (aq) + 2H₂O (l)

Here one mole of Ca (OH)₂ reacts with two moles of HCl and gives one mole of CaCl₂ and two moles of H₂O respectively. Here Ca (OH)₂ is a white precipitate and HCl is a aqueous solution.

Thus the correct option is D.

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What percentage of Americans believes that humans are causing global warming?
10
24
68
93

Answers

Answer:

49% say human activitiy contributes global warming.

Answer:

The answer is 68%

Explanation:

including me :)

What is the pH of a 0.0170 M solution of HI?

Answers

Answer:

To solve the problem, enter the concentration of the hydrogen ion. The pH of a 0.025 M solution of Hydrobromic Acid is 1.602.

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