How many liters of oxygen are needed to react completely with 81.0 g of aluminum at STP?
A.) 25.2 L
B.) 72.0L
C.) 50.4 L
D.) 67.2 L

Answer:

A. 15

Explanation:

From the equation we see that 6 water particles are used to make 1 particle of the hexose.

That means, that to make 1 mole of the hexose, we need 6 moles of water (as a mole is an unit of count of particles).

To make 2.5moles of the hexose, we need 2.5*6 moles of water, so 15 moles of water.

Radiation from alpha decay has the least energy.

Alpha decay is the name for the nuclear process that releases alpha particles. Two protons that were lost by the uranium atom are present in the alpha particle. Additionally, the two protons have a +2 charge. The particle's mass, or the sum of its protons and neutrons, is represented by the top number, 4, in this case. Alpha particles must also have two neutrons because they have two protons, making a total of four protons and neutrons. Two protons and two neutrons are the constant components of alpha particles.

A nuclear process known as "alpha decay" releases a particle made up of two protons and two neutrons when an unstable nucleus transforms to another element. The helium nucleus that is being ejected is known as an alpha particle.

To learn more about alpha decay refer the link:
https://brainly.com/question/27870937

#SPJ1

Answer:

C) Alpha decay

Explanation:

Alpha decay, beta decay, electromagnetic decay, Gamma decay

its least to greatest

Answer:

0.468 m

Explanation:

From the question given above, the following data were obtained:

Mass of napthalalene (C₁₀H₈) = 30 g

Mass of toulene = 500 g

Molality =?

Next, we shall determine the number of mole in 30 g of C₁₀H₈. This can be obtained as follow:

Mass of C₁₀H₈ = 30 g

Molar mass of C₁₀H₈ = (12×10) + (8×1)

= 120 + 8

= 128 g/mol

Mole of C₁₀H₈ =?

Mole = mass / molar mass

Mole of C₁₀H₈ = 30 / 128

Mole of C₁₀H₈ = 0.234 mole

Next, we shall convert 500.0 g of toulene to Kg. This can be obtained as follow:

1000 g = 1 Kg

Therefore,

500 g = 500 g × 1 Kg / 1000 g

500 g = 0.5 Kg

Finally, we shall determine the molality of the solution. This can be obtained as follow:

Mole of solute (C₁₀H₈) = 0.234 mole

Mass of solvent (toulene) = 0.5 Kg

Molality =?

Molality = mole of solute / Kg of solvent

Molality = 0.234 / 0.5

Molality = 0.468 m

Answer:

Facts About Biosphere 1: The Evolution Of Biosphere

Biosphere has evolved.  It started from the non living matter or simple organic compound which created the life. This process is called bioprocess which conducted around 3.5 billion years ago.

Facts about Biosphere 2: the life of earth

It is not easy for the scientists to determine the life of earth.  However, they can estimate it after the discovery of the metasedimentary rocks from Western Greenland. The scientists believed that it was dated back around 3.7 billion years old.

Facts About Biosphere 3: Another Evidence For The Earth’s Life

Evidence was found in Western Australia. The discovery of microbial mat fossils made the scientists estimated that the earth was dated around 3.48 billion years ago.

Answer:

The following numbers are true for protons:

2.

5.

7.

Explanation:

I know for a fact that Protons have a positive charge

they are located inside of the nucleus

Go.ogle says that they aren't involved in bonding

And it says that it has a mass of one

I hope this helps chu <3

Answer:

two ions can combine in only one combination.The number of ions is not fixed in a compound.

Answer:

Explanation:El mol es una unidad conveniente de usar debido a la gran cantidad de átomos, moléculas u otros en cualquier sustancia.

Answer:

All Answers only for the elite; Nomenclature of Covalent Compounds Quiz

You're Welcome :)

Explanation:

A-hydrochloric acid

B-sulfuric acid

C-dinitrogen pentoxide

C- IBr3

A- carbon dioxide

B- Start the name with hydro-.

B- H3BO3

C-sulfur trioxide

A- NH3

B- The chemical name ends with “hydroxide.”

Protons and neutrons are particles that make up the dense nucleus at the center of an atom. Protons have a positive electric charge, and neutrons have no electric charge (i.e., neutrons are electrically neutral).

Electrons are particles that are found surrounding the nucleus; electrons have a negative electric charge.

The magnitude of a proton's positive charge and an electron's negative charge are equal in magnitude. All they differ in is in their polarity.

So, an atom that has the same number of protons and electrons would be electrically neutral. An ion is an atom that has a non-neutral charge because of an imbalance between the number of protons and electrons. If there are more electrons than protons, there is a net negative charge, and this type of ion is called an anion; if there are fewer electrons than protons, there is a net positive charge, and this type of ion is called a cation.

In this case, we have an element (or, more precisely, an atom of an element) that has 35 protons, 36 electrons, and 45 neutrons. There is one more electron than there are protons. This is called an anion because there are fewer electrons compared to protons.

Considering the definition of ion, cation and anion, this is called an anion  because there are  more electrons compared to protons.

All atoms are composed of a central nucleus in which there are particles with a positive electric charge, the protons, around which other particles with a negative electric charge that are electrons move. Thus, the atom is electrically neutral, since the positive charge of the protons is compensated by the negative charge of the electrons.

On the other hand, an ion is a particle with an electrical charge obtained by adding or removing electrons from atoms or molecules.

An electron-deficient atom or molecule has a positive charge and is called a cation; On the other hand, when there are excess electrons, the ion has a negative charge and is called an anion.

In other words, if an atom, or atoms, does not have a balanced number of negatively charged electrons and positively charged protons, these species will be charged and are called ions.

A cation has more protons than electrons, giving it a net positive charge. For a cation to form, one or more electrons must be lost.

An anion has more electrons than protons, which gives it a net negative charge. For an anion to form, one or more electrons must be gained.

In this case, an element has 35 protons, 36 electrons, and 45 neutrons. This is called an anion  because there are  more electrons compared to protons.

Learn more:

Answer:

Unbalanced

Explanation:

The reactants side says 2Na. This means there should also be 2Na on the product's side. However, there is only 1 Na there. Therefore, the chemical equations are unbalanced.

Hope this helps! If it did, please mark it as brainliest! It would help a lot! Thanks! :D

Answer:

The temperature of the solution will decrease.

Explanation:

Less energy is released than is used, the molecules of the solution move more slowly, making the temperature decrease.

According to the concept of solubility, lowering of the freezing point  results when a solute dissolves in a solvent.

Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance usually a solvent. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute  which is present in a saturated solution.

The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on parameters of  temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.

Learn more about solubility,here:

https://brainly.com/question/28170449

#SPJ2

Answer:

b. proton

Explanation:

The mass of an electron is only about 1/2000 the mass of a proton or neutron, so electrons contribute virtually nothing to the total mass of an atom. Electrons have an electric charge of −1, which is equal but opposite to the charge of a proton, which is +1.

Answer:

5 atoms of hydrogen will be found in the products

Explanation:

5 atoms of hydrogen will be found in the products becuase the law of conservation of mass states that mass is neither created nor destroyed in chemical reactions.

Answer:

34.8 mL

Explanation:

First we convert 5.48 g of CuNO₃ into moles, using its molar mass:

Now we can calculate the volume of the solution, using the definition of molarity:

Finally we convert L into mL:

Answer:

The answer is C: KCN

Explanation:

KCN is a strong electrolyte. Electrolytes is inside your body to renergize you and help you stay strong.

Answer: the answer would be B

Answer:

Cycle

Explanation:

The molecular formula is ALWAYS, a whole number multiple of the empirical formula....and of course the multiple might be one...

And so we can write....

{empirical formula}n=molecular formula

And taking the given molecular mass of 70.13⋅g⋅mol−1

n=70.13⋅g⋅mol^−1/(12.011+1.00794×2)⋅g⋅mol−1=5

And so....

{CH2}×5=C5H10

The empirical formula of the compound is CH₂ . Then, the formula mass is 14 g. If the molar mass of the compound is 70.13 g the compound has the molecular formula of C₅H₁₀.

The empirical formula of a compound is the formula derived from the number of moles of the constituent elements of the compound. The number of moles of the elements present can be calculated from their given masses and atomic mass.

The formula mass of a compound is the mass of the elements with their number of atoms as in the empirical formula.

given the empirical formula is CH₂.

atomic mass of C = 12 g/mol

atomic mass of H = 1 g/mol

then formula mass = 12 + 2 = 14 g.

Divide the molar mass by formula mass;

molar mass = 70.13 g

70.13 g/14 g =  5

Now, multiply the empirical formula by 5 to get the molecular formula.

ie.  C₅H₁₀.

Find more on empirical formula:

https://brainly.com/question/14425592

#SPJ7

Answer:

It's a Planarian

Explanation:

Answer above

Answer:

A

Explanation:

Answer:

As food passes through the GI tract, it mixes with digestive juices, causing large molecules of food to break down into smaller molecules. The body then absorbs these smaller molecules through the walls of the small intestine into the bloodstream, which delivers them to the stomach

Answer:

Food contents that the animal or creature has swallowed goes into the stomach. The contents gets broken down. The energy from the contents will then go through the body.

Answer:

2Fe + 3Cl2 --> 2 FeCl3

Explanation:

Fe + Cl2 -->  FeCl3

iron is balanced but chlorine isn't so we find what number can make each one equal

Fe +3Cl2 --> 2FeCl3

now we need to balance iron

2Fe + 3Cl2 --> 2 FeCl3

Answer:

A They are incorporated into molecules of sugar.

Explanation:

Photosynthesis is the metabolic process whereby sugar molecules are synthesized by plants in the presence of sunlight (light energy). For this process to occur, carbon dioxide (CO2) and water (H2O) are needed as reactants from external sources. Hence, the photosynthetic equation is as follows:

6CO2 + 6H2O → C6H12O6 + 6O2

According to this question, the carbon atoms in carbon dioxide are incorporated into sugar molecule (glucose). It takes 6 carbon atoms to produce one glucose molecule (C6H12O6). This process involves series of reaction in the light-independent stage of photosynthesis to occur.

Answer:

Option A. 66 g

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

CH₄ + 2O₂ —> CO₂ + 2H₂O

Next, we shall determine the mass of CH₄ that reacted and the mass of CO₂ produced from the balanced equation. This is illustrated below:

Molar mass of CH₄ = 12 + (4×1)

= 12 + 4 = 16 g/mol

Mass of CH₄ from the balanced equation = 1 × 16 = 16 g

Molar mass of CO₂ = 12 + (16×2)

= 12 + 32 = 44 g/mol

Mass of CO₂ from the balanced equation = 1 × 44 = 44 g

SUMMARY:

From the balanced equation above,

16 g of CH₄ reacted to produce 44 g of CO₂.

Finally, we shall determine the theoretical yield of CO₂. this can be obtained as follow:

From the balanced equation above,

16 g of CH₄ reacted to produce 44 g of CO₂.

Therefore, 24 g of CH₄ will react to produce = (24 × 44) /16 = 66 g of CO₂.

Thus, the theoretical yield of CO₂ 66 g

The theoretical yield of  CO₂ is 66 grams.

The balanced chemical equation of the reaction is as follows:

CH₄  +  2O₂  →  CO₂  +  2H₂O

mass number of CH₄ = 16 g

mass number of CO₂ = 44 g

Therefore,

16 of CH₄ produced  44g of  CO₂

24 g of CH₄ will give ?  of CO₂

cross multiply

mass of CO₂ produced = 24 × 44 / 16

mass of CO₂ produced = 1056 / 16

mass of CO₂ produced = 66 grams

read more: https://brainly.com/question/10212233?referrer=searchResults

Answer:

[tex]1.26*10^2^4[/tex]

Explanation:

To find molecules, we will need to multiply the number of moles of carbon monoxide by Avogadro's number. Avogadro's number is [tex]6.022*10^2^3[/tex].

So the equation would look like this:

[tex](2.1) * (6.022*10^2^3) = 1.26 *10^2^4[/tex]