How many atoms are in a sample containing 7 moles of phosphorus?

Ranks the objects from most to least dense : X,Z,Y,W

Given

Object W : m=16 g, V=84 cm³

Object X : m=12 g, V= 5 cm³

Object Y : m=4 g, V= 6 cm³

Object Z : m=408 g g, V= 216 cm³

Required

Density

Solution

Density formula:  

[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]

ρ = density  

m = mass  

v = volume  

1. Object W

[tex]\tt \rho=\dfrac{16}{84}=0.19[/tex]

2. Object X

[tex]\tt \rho=\dfrac{12}{5}=2.4[/tex]

3. Object Y

[tex]\tt \rho=\dfrac{4}{6}=0.67[/tex]

4. Object Z

[tex]\tt \rho=\dfrac{408}{216}=1.89[/tex]

From most to least dense : X,Z,Y,W

Answer:

geosphere

Explanation:

Answer:

differential weathering.

Explanation:

Answer:

Molecular formula = SF₆

Empirical formula is SF₆

Explanation:

Percentage of sulfur = 21.95%

Percentage of fluorine = 78.03%

Molar mass of compound = 146.1 g/mol

Empirical formula = ?

Molecular formula = ?

Solution:

Number of gram atoms of S = 21.95 / 32= 0.69

Number of gram atoms of F = 78.03 / 19 =  4.107

Atomic ratio:

                                  S                  :         F

                                0.69/0.69      :       4.107/0.69

                                     1                :         6

S : F =  1:6

Empirical formula is SF₆

Molecular formula:

Molecular formula = n (empirical formula)

n = molar mass of compound / empirical formula mass

Empirical formula mass :

32 + 19×6 = 146

n = 146.1 / 146

n = 1

Molecular formula = n (empirical formula)

Molecular formula = 1 (SF₆)

Molecular formula = SF₆

Answer:

The sugar atoms formed new atoms after caramelization.

Explanation:

When sugar is heated to a certain temperature, it becomes caramel. Te formation of caramel from the sugar is a chemical process.

In the context, Pedro is doing an investigation by heating sugar to make caramel. Burning of the sugar crystal is a chemical change as different chemicals are present in both. The caramel formed cannot be revered back to sugar crystal, this also proves the chemical change of caramelization of sugar cubes. Sugar consists of carbon, oxygen and hydrogen atoms. It reacts with atmospheric oxygen atoms to form new groups of atoms and forms caramel.

Answer:

Petals are modified leaves that surround the reproductive parts of flowers. They are often brightly colored or unusually shaped to attract pollinators. Together, all of the petals of a flower are called corolla.

Answer:

sodium

Explanation:

nitrogem, phosphorous and potassium are very important to plant growth, but sodium isnt necessary.

Answer:

the answer is sodium hope this helps

Answer:

c actual contains three atom

Answer:

Cu2+

Srry if I didnt help..

The metallic ion in the compound CuCl₂ is copper (Cu).

CuCl₂ is a combination of copper (Cu) and chlorine (Cl) ions. In this compound, copper has a positive charge of 2, and chlorine has a negative charge of 1. Copper is a type of metal that can make different charged particles (called ions) depending on what it combines with and how it reacts.

In CuCl₂, the copper ion has a positive charge of 2. This means that it has given away two electrons and has an oxidation state of +2. The chlorine ions have a negative charge of -1 because they have taken in one electron. This shows that they have an oxidation state of -1.

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Answer:

+4

Explanation:

Answer:

That change is known as melting.

Explanation:

I am not sure what you are asking. I hope this helps!

Answer:

Speed is how fast you cover a certain distance

[tex]Speed=\frac{Distance}{time}[/tex]

Answer:

ANIMAL CELL

Animal cells are generally small in size.

They don't have a cell wall

Except the protozoan Euglena, no animal cell possesses plastids.

Vacuoles in animal cells are many, small and temporary.

Animal cells have a single highly complex and prominent Golgi apparatus.

Animal cells have centrosome and centrioles.

PLANT CELL

Plant cells are larger than animal cells.

The plasma membrane of plant cells is surrounded by a rigid cell wall of cellulose.

They have Plastids

Most mature plant cells have a permanent and large central sap vacuole.

Plant cells have many simpler units of Golgi apparatus, called dictyosomes.

Plant cells lack centrosome and centrioles.

Hope this helps!

Answer: Differences between animal and plant cells :

Explanation:

Answer:

the equation could have mulitplication and square roots which may change the function of the line

Answer:

The large the atomic radius the more the metallic character of elements

Explanation:

The atomic radius is related to the metallic character in a way that the larger the atomic radius, the more metallic a body becomes.

Therefore, as we go down a group, metallic character increases.

Answer:

It helps it not to break or crack. It is like an outer shell to protect it.

Explanation:

Answer:

C. Distance and mass.

Explanation:

Objects that have greater mass have more force of gravity between them.

Answer:

Gasses and particles in Earth's atmosphere scatter sunlight in all directions. Blue light is scattered more than other colors because it travels as shorter smaller waves. This it why we see a blue sky most of the time

Explanation:

I looked it up

Answer:

sun shine

Explanation:

A clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light. When we look towards the sun at sunset, we see red and orange colours because the blue light has been scattered out and away from the line of sight.

Answer:

the molar mass of NaOCl is 74.5g

Answer:

mass

Explanation:

Answer:

mass mass mass mass mass

Answer:

Detail is given below

Explanation:

Differences:

Ionization involves the formation of ions while in dissociation substance are break into atoms, ions or molecules.

In ionization atoms and molecules gain positive or negative charge.

While in dissociation positive and negative ions are not essentially formed substance could be break into neutral small particles.

Ionization occur in covalent compounds while dissociation occur in ionic compound.

Ionization example:

Cl + e⁻    →  Cl⁻

Dissociation example:

NaCl   →   Na⁺ + Cl⁻

Here sodium and chloride ions are formed but in sodium chloride these ions were already present.

Another example:

N₂O₄   →     2NO₂

Answer:

Yes

Explanation:

Answer:the plural of walrus is walruses

Explanation:

Answer:

Solar photons

Hope this helps :)

Answer:

6 moles of SO₃ formed.

Explanation:

Given data:

Number of moles of SO₃ formed = ?

Number of moles of oxygen react = 3 mol

Solution:

Chemical equation;

2SO₂+ O₂      →   2SO₃

now we will compare the moles of oxygen and sulfur trioxide.

                             O₂            :            SO₃

                               1             :             2

                               3            :           2/1×3 = 6 moles

Thus, six moles of SO₃ will formed.

Answer:

99.90g

Explanation:

1.506 x 10^24atoms × [tex]\frac{1mol}{6.022*10^{23}atoms}[/tex] × [tex]\frac{39.948grams}{1mol}[/tex] = 99.90grams

multiply the atom by constant and by its molar mass

1.506 x 10²⁴ atoms of argons gas is two moles. One mole of argon weighs 35.9 g. Thus mass of two moles of argon is 89.9 g.

Argon is 18th element in periodic table. It is placed in 18 the group and it is a noble gas or inert gas with completely filled orbitals. The group members of argon are neon, krypton, xenon and radon.

One mole of every substance contains 6.022 × 10²³ atoms. This number is called Avogadro number. Therefore, one mole of every element contains Avogadro number of atoms. The atomic mass of an element is the mass of one mole of that element.

Mass of one mole of argon is 35.9 g. Thus, it contains  6.022 × 10²³ atoms. Hence, the number of moles that contains  1.506 x 10²⁴ atoms is calculated as follows:

no.of moles =  1.506 x 10²⁴  / 6.022 × 10²³

                    = 2.5 moles.

The mass of 2.5 moles of argon is 2.5 × 35.9 = 89.9 g. Hence, the mass of  1.506 x 10²⁴ argon atoms is 89.9 g.

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Answer:

The correct answer is - cellular respiration is when chemical energy from sugar/glucose is converted to cellular energy in the form of ATP.

Explanation:

Cellular respiration is a set of metbolic reaction that takes place inside the cell and breaking the sugars or nutrients to convert the chemical energy present in the nutrients into the cellular energy whic is used by cells that is ATP and release water and carbon dioxide as waste.

In this process the ammount of energy store in the cellular currecncy or ATP which is the form of energy that is utilized by the to perform its sunction. The chemical energy that is present in the nutrients or sugar is come from light energy which is stored in the nutrients by photosyntheis process.

Answer:

my best guess is b

Explanation:

typically the lower the pitch the longer the wave line inbetween the inclines are

Answer:

the answer to this question is option A mark me as brainliest

Answer:

521 nm

Explanation:

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

Frequency (v) = 5.76×10¹⁴ s¯¹.

Wavelength (λ) =.?

RECALL: velocity (c) of light = 3×10⁸ m/s

Thus, we can obtain the wavelength of the green light by using the following formula:

c = vλ

3×10⁸ = 5.76×10¹⁴ × λ

Divide both side by 5.76×10¹⁴

λ = 3×10⁸ / 5.76×10¹⁴

λ = 5.21×10¯⁷ m

Next, we shall convert 5.21×10¯⁷ m to nanometer (nm). This can be obtained as follow:

1 m = 1×10⁹ nm

Therefore,

5.21×10¯⁷ m = 5.21×10¯⁷ m × 1×10⁹ nm / 1 m

5.21×10¯⁷ m = 521 nm

Thus, 5.21×10¯⁷ m is equivalent to 521 nm

Therefore, the wavelength (λ) of the photon of the green light is 521 nm.

Answer:

the wavelength (λ) of the photon of the green light is 521 nm.