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Answer:

18.1 g

Explanation:

You know that the atomic weight of phosphorus is equal to  

30.794 u

, where  

u

represent the unified atomic mass unit.

The unified atomic mass unit is equivalent to  

1 g/mol

, but let's take the long road and prove that identity.

Now, the unified atomic mass unit is defined as  

1

12

th

of the mass of a single unbound carbon-12 atom in its ground state and is equivalent to

1 u

=

1.660539

⋅

10

−

24

g

This means that the mass of one phosphorus atom will be

30.974

u

⋅

1.660539

⋅

10

−

24

g

1

u

=

5.14335

⋅

10

−

23

g

You know that one mole of any element contains exactly  

6.022

⋅

10

23

atoms of that element - this is known as Avogadro's number.

Well, if you know the mass of one phosphorus atom, you can use Avogadro's nubmer to determine what the mass of one mole of phosphorus atoms

5.14335

⋅

10

−

23

g

atom

⋅

6.022

⋅

10

23

atoms

1 mole

=

30.974 g/mol

Finally, if one mole of phosphorus atoms has a mass of  

30.974 g

, then  

0.585

moles will have a mass of

0.585

moles

⋅

30.974 g

1

mole

=

18.1 g

From: https://socratic.org/questions/the-atomic-weight-of-phosphorus-is-30-974-u-what-is-the-mass-of-a-phosphorus-sam

Answer:

b, c, e

Explanation:

Inorganic compounds usually lack carbon.

Inorganic compounds are not associated with or made from living things.

Inorganic compounds include salt and water​.

Answer:

yes the answer id bce

Explanation:

Explanation:

Molality is the ratio of the amount of substance of a solute (in moles – n) to the mass in kilograms of the solvent (m).

The symbol for molality is usually W and it can be calculated by the following formula:

W = n/m

here, we need to calculate n of NaCl using the formula:

n = m/MM

where MM of NaCl is 58.5 g/mol

n = 120/58.5

n = 2.05 moles

W = 2.05/30

W = 0.068 mol/Kg

Answer: A) 0.068

Answer:

kinetic energy is that form of mechanical energy that has been released and is associated with the body in motion.

Explanation:

My best answer

A balanced chemical equation for the standard formation reaction of liquid chloroform is :

CH₄   +   3Cl₂   ----->   CHCl₃   +     3HCl

The methane combine with chlorine form the trichloro methane or the chloroform.

CH₄   +   Cl₂   ----->   CHCl₃   +     HCl

to balance the equation , the number of atoms in the product side is equal to the reactant side :

               reactant            product

C                     1                      1

H                     4                      2

Cl                     2                     4

to balance the equation miltiply 3 in Cl₂ and 3 in HCl, we get :

CH₄   +   3Cl₂   ----->   CHCl₃   +     3HCl

now the number of atoms in the product side is equal to the reactant side .

Thus, A balanced chemical equation for the standard formation reaction of liquid chloroform is :

CH₄   +   3Cl₂   ----->   CHCl₃   +     3HCl

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Evolution can be defined as the change in genetic of any population over time.

1. An adaptation is any heritable trait that helps an organism, such as a plant or animal, survive and reproduce in its environment.

2. Evolution is a process that results in changes in the genetic material of a population over time.

3. Natural selection, organisms that possess heritable traits that enable them to better adapt to their environment compared with other members of their species will be more likely to survive, reproduce, and pass more of their genes on to the next generation.

4. Charles Darwin is known as the father of evolution.

5. Darwin postulated that the beak of an ancestral species had adapted over time to equip the finches to acquire different food sources.

6. When a trait is expressed in more than one way, such as the different colours of the beetles, it is called variation.

7. A queen honeybee can lay up to 2000 eggs in one day. this is an example of overproduction of offspring.

8.  In human beings, eye colour, eyebrows, earlobe size, and the ability to curl one's tongue are nonadaptive traits.

9. A dragonfly wing is the homologous structures.

10. Years of selective breeding by humans has resulted in the artificial "evolution" of dogs into many different types.

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Answer:

Explanation:

I tried to figure it out but my head wasn’t working sorry

An example of a biotic factor of an aquarium ecosystem is an  algae growing on the glass. Option B is the correct answer.

This refers to a living organism that shapes its environment. The examples of biotic factor that make up fresh water ecosystem are: aquatic plants, fish, amphibians,fungi, bacteria, and protists. and algae.

The biotic factors are gropped into : producers, consumers, and decomposers.

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The new volume of the gas whose pressure was changed would be = 40 milliliters.

The initial volume(V1)of the gas= 20ml

The initial pressure(P1) = 4 atm

The final pressure(P2) = 2 atm

The final volume(V2) = ?

Using the general gas formula;

P1V1 = P2V2

V2 = P1V1/P2

= 4×20/2

= 40ml

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Answer:

A

Explanation:

A option is correct .

you cannot create energy neither you can destroy it but you can only convert into other form

Answer:

valence electrons

Explanation:

they are the electrons that are in the outermost shell

The total mass of the balloon and its content is 1521.17 g, the number of moles of CO₂ in the balloon is 34.15 mol, and the number of CO₂ molecules in the balloon is 2.06 x 10²⁵ molecules.

a) The molar mass of CO₂ is 44.01 g/mol. To find the total mass of the balloon and its content, we need to add the mass of the balloon (20g) to the mass of the CO₂ inside the balloon.

Mass of CO₂ = number of moles of CO₂ x molar mass of CO₂

Since the balloon is at STP (standard temperature and pressure), we can use the molar volume of a gas at STP (22.4 L/mol) to find the number of moles of CO₂ in the balloon:

Volume of CO₂ = Volume of balloon = 765 L (at STP)

Number of moles of CO₂ = volume of CO₂ / molar volume of a gas at STP

                                          = 765 L / 22.4 L/mol

                                          = 34.15 mol

Mass of CO₂ = 34.15 mol x 44.01 g/mol

                       = 1501.17 g

Total mass of balloon and its content = 20 g + 1501.17 g

                                                               = 1521.17 g

b) Number of moles of CO₂ in the balloon is 34.15 mol

c) To find the number of CO₂ molecules in the balloon, we need to use Avogadro's number (6.02 x 10²³ molecules/mol).

Number of CO₂ molecules = number of moles of CO₂ x Avogadro's number

                                           = 34.15 mol x 6.02 x 10²³ molecules/mol

                                           = 2.06 x 10²⁵ molecules

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Container 3 has the gas stored at the highest temperature.

Temperature is a measure of the average kinetic energy of the particles in a substance. In the given table, it is stated that container 3 has a large number of collisions with container walls, high average kinetic energy, and large number of particles with large spaces between them.

These properties indicate that the gas in container 3 has higher kinetic energy and more vigorous movement compared to the other containers.

Container 1 has a low number of collisions with container walls and a medium average kinetic energy. This suggests that the gas in container 1 has lower energy and less movement than the gas in container 3.

Container 2 has a large number of collisions with container walls, but it also has a small number of particles with little spaces between them. While the collisions may be frequent, the limited number of particles and the lack of space between them may result in lower overall kinetic energy compared to container 3.

Container 4 has few collisions with container walls, low average kinetic energy, and a small number of particles. These properties indicate that the gas in container 4 has the lowest energy and least movement among all the containers.

Container 3

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The kinetic-molecular theory's true assertions are as follows:

If both containers' temperatures are the same, container A will have a higher pressure than container B.

Container A has a lower temperature than container B if the pressure in both containers is equal.

The molecules that make up a gas are always moving randomly, colliding with one another and the container walls, according to the kinetic molecular hypothesis. Remember that high temperature and low pressure are the only conditions in which perfect gases can exist.

The kinetic-molecular theory's true assertions are as follows:

If both containers' temperatures are the same, container A will have a higher pressure than container B.

If both are under pressure

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Answer:

hydrochloric acid

Explanation:

chemical compound any substance composed of identical molecules consisting of atoms

Answer:

The solid-liquid line in the water phase diagram has a negative slope, whereas for most other substances it has a positive slope.

The ice has a lower density as compared to water still they have in the solid phase.

In the solid-liquid line in the water phase diagram it contains the negative slope. While the most other substance should have the positive slope.

Also, when the pressure is applied so the higher density should be favored. In the water, the highest density phase should be likely the liquid water.

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Answer:

0.0831 moles of NaOH were in the original mixture

Explanation:

The strontium hydroxide, Sr(OH)2, requires 2 moles of HCl per mole of hydroxide to be neutralized.

The sodium hydroxide, NaOH, requires 1 mol of HCl per mol of hydroxide.

To solve this question we must write 2 equations:

(1) 0.19mol = X + Y

Where X = Moles NaOH; Y = Moles Sr(OH)2

The moles of HCl required are:

0.100L * (2.969mol / L) = 0.2969 moles HCl

0.2969 mol = X + 2Y(2)

Replacing (1) in (2):

0.19mol - Y = X

0.2969 mol = (0.19mol - Y) + 2Y

0.1069mol = Y

Moles X = Moles NaOH:

0.19mol = X + 0.1069mol

X = 0.0831 moles of NaOH were in the original mixture

Answer:

I also think NaOH is the answer since they are all strong electrolytes and NaOH has the highest number

Explanation:

Nuclear structure and stability

Although the decay properties of the transuranium elements are important with regard to the potential application of the elements, these elements have been studied largely to develop a fundamental understanding of nuclear reactions and nuclear and atomic structure.

Answer:

Single-replacement reaction

Explanation:

Single-replacement reactions, aka. single-displacement reactions, involve one element/ion in a compound being replaced by another element/ion. In this case, aluminum is replacing the iron in the compound.

If you need help visualizing, the equation looks like this:

Fe₂O₃ + Al³⁺ --> Al₂O₃ + Fe³⁺

To prepare a 0.12 M solution of FeCl₃, the amount of solid FeCl₃ to be dissolved in a given volume of solvent will be 9.72 grams.

Given,

Molarity of FeCl₃ (M)= 0.12 M

The molecular weight (m) of FeCl₃ is  = 162 gm

The volume of the solution (V) to be prepared is =500 ml

The amount of FeCl₃ to be dissolved to make a 0.12 M solution is= x

So,

MV= x ÷ m × 1000

0.12× 500 = x ÷ 162 × 1000

x = 60 × 162 ÷ 1000

x= 9.72 gm

So 9.72 grams of FeCl₃ is dissolved to make 500 ml of 0.12 M solution.

For preparing 0.4 M HCl from 4M HCL:

If we need to make 500 ml of solution with 0.4M of HCL, then we use the formula:

M₁V₁= M₂V₂

0.4 × 500= 4 × x

x= 50 ml

So 50 ml of 4M HCL is taken to make 0.4 M HCL.

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The pH of the given aqueous solution with [H+] = 0.0055 M at 298 K is approximately 2.26.

The formula used to find the pH of the solution is given as,

pH = -log[H+]

Substituting [H+] = 0.0055 M into the above formula, we get,

pH = -log(0.0055) ≈ 2.26

Therefore, the pH of the given aqueous solution with [H+] = 0.0055 M at 298 K is around 2.26.

A solution's acidity or basicity is determined by its pH. It is described as the hydrogen ion concentration's negative logarithm, pH = -log(H+). It is commonly expressed as [H+] and measured in units of moles per litre (M).

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A hypothesis is a proposed explanation or prediction based on limited evidence or observations, which can be tested through further investigation or experimentation. It should be specific, testable, and based on existing knowledge.

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Answer:

0.0011455108359133

Explanation

323K=0.370atm

1K=0.370/323

Two elements that could displace iron in a single replacement reaction are magnesium and zinc. This determination is made based on the reactivity series, which ranks metals according to their ability to displace other metals in aqueous solutions.

An element replaces another element in a compound in a single replacement reaction, creating a new compound and a different element.

The reactivity series determines the displacement of metals in single replacement reactions by ranking metals in order of their reactivity, with the most reactive metal displacing less reactive metals from their compounds.

Magnesium and zinc, which are more reactive than iron, can displace iron in a single replacement reaction.

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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:

The best answer 1 and 2, the carbon skeletons of which two amino acids enter metabolism at the level of pyruvate are alanine and serine or alanine and cysteine.

Metabolism refers to the chemical processes that occur within an organism to maintain life. These processes include the breakdown of nutrients to release energy and the synthesis of molecules that the body needs for growth and repair. There are two main types of metabolism: catabolism, which involves the breakdown of molecules to release energy, and anabolism, which involves the synthesis of molecules using energy.

The rate at which an individual's metabolism operates can affect their weight, with a faster metabolism generally leading to a higher rate of calorie burn and a slower metabolism leading to a lower rate of calorie burn. However, factors such as genetics, age, and sex also play a role in determining an individual's metabolism. Additionally, lifestyle factors such as diet and physical activity can also impact metabolism, with regular exercise and a balanced diet known to help boost metabolism.

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Answer: The factor that lead to cyclopropane being less stable than the other cycloalkanes is the presence of a RING STRAIN.

Explanation:

In organic chemistry, the end carbon atoms of an open aliphatic chain can join together to form a closed system or ring to form cycloalkanes. Such compounds are known as cyclic compounds. Examples include cyclopropane, cyclobutane, cyclopentane and many among others.

Cyclopropane is less stable than other cycloalkanes mentioned above because of the presence of ring strain in its structural arrangement. The ring strain is the spatial orientation of atoms of the cycloalkane compounds which tend to give off a very high and non favourable energy. The release of heat energy which is stored in the bonds and molecules cause the ring to be UNSTABLE and REACTIVE.

The presence of the ring strain affects mainly the structures and the conformational function of the smaller cycloalkanes. cyclopropane, which is the smallest cycloalkane than the rest mentioned above, contains only 3 carbons with a small ring.