How many molecules are in 56.2 L
of CO2 at STP?

Answer:

This problem is providing a chemical equation between two hypothetical elements, X and Y and asks for the molesof X that are needed to 

produce 21.00 moles of D in excess Y. After the following work, the answer turns out to be 15.75 mol X:Mole ratios:In chemistry, one the most crucial branches is stoichiometry, which allows us to perform calculations with grams, moles and particles (atoms, molecules and ions). It is based on the concept of mole ratios, whereby the moles of a specific substance can be converted to moles of another one, say product to reactant, reactant to reactant, reactant to product and product to product.

Calculations:In such a way, since 21.00 moles of D are given, we need the mole ratio of D to X in order to get the answer, which according to the reaction is 3:4 based on their coefficients in the reaction. Hence, we calculate the required as follows:

Explanation:

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Answer:

What do hurricanes, tornadoes, and thunderstorms have in common?

ANSWER : Low pressure systems

Answer:

A- upfield

B- down field

C- splitting

D- chemical shift

E- integration

Explanation:

NMR is a spectroscopic technique commonly used to observe the magnetic fields around the nucleus of atoms in a compound under investigation.

A chemical shift is the difference in parts per million (ppm) between the resonance frequency of the observed protons in the compound under study and that of the tetramethylsilane (TMS) (the reference compound in NMR with a chemical shift of zero ppm because all protons in the compound are equivalent).

If signals appear close to the reference signal, the signals are said to appear upfield. If the signals appear far away from the reference, they are said to appear down field.

The presence of protons cause splitting of peaks to the magnitude of n+1. n is the number of neighboring protons. Splitting refers to the appearance of multiple peaks for a single nucleus due to neighboring nuclei.

The area of a signal that corresponds to the number of nuclei at that frequency is called the integration.

Answer:

rise the fall

Explanation:

when air is heated it become lighter then rise but when cooled it becomes heavy and fall

Answer:

242

96

1

0

Explanation:

Knowing the functioning of balancing equations, we have that the values ​​of the constants correspond to 242, 96, 1 e 0.

Given the equation we have:

[tex]239 \ 94 Pu + 4 2 He \rightarrow a b Cm + c d[/tex]

Knowing from the beginning that nothing is lost and nothing is created but everything is transformed, we will have that the value of the constants will be given by:

so for a and b we will calculate as:

[tex]239+3=a\\a=242\\94+2=b\\b=96[/tex]

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Answer:

"0.053457 M" of sulfuric acid.

Explanation:

The given values are:

[tex]V[/tex] = 10 mL solution

[tex]V_{added}[/tex] = 12.20 mL

[tex]V_{total}[/tex] = 22.20 mL

then,

M 0.103 M of NaOH,

[tex]V_{rinsed}[/tex] = experiment  will not be affected

[tex]V_{total \ base}[/tex] = 10.38 mL

Now,

⇒  mol of NAOH = MV

                            = [tex]0.103\times 10.38[/tex]

                            =  [tex]1.06914 \ m[/tex]

Whether Sulfuric acid, then

⇒  [tex]H_{2}SO_{4} + 2NaOH = Na_{2}SO_{4} + 2H_{2}O[/tex]

⇒  [tex]mol \ of \ acid =\frac{1}{2}\times \ mol \ of \ base[/tex]

⇒  [tex]1.06914 \ m \ mol \ of \ base = \frac{1}{2}\times 1.06914 = 0.53457 \ m \ mol \ of \ acid[/tex]

Before any dilution:

[tex]V_{sample} = 10 \ mL[/tex]

⇒  [tex]M \ acid = \frac{m \ mol}{V}[/tex]

                 [tex]=\frac{ 0.53457 }{10}[/tex]

                 [tex]=0.053457 \ M[/tex] (Sulfuric acid)

Answer:

what are sediments???????????????????????

Explanation:

Sediment is a naturally occurring material that is broken down by processes of weathering and erosion, and is subsequently transported by the action of wind, water, or ice or by the force of gravity acting on the particles.

I hope that helped you.

Answer:

a naturally occurring material that is broken down by processes of weathering and erosion.

Explanation:

Dictionaries help with definitions such as the one I've given you.    :)

Answer:

Chemical

Explanation:

Macromolecules are part of the chemical components of cells. For example, DNA, proteins, and lipids.

Cells of similar types/function form tissues. Different types of tissues interact together to form organs. Organs form a common function.

Answer:

Rounding volume to nearest whole number is 5cm³.

Explanation:

Given data:

Mass of smaller iron cube = 20 g

Density of cube = 7.87 g/cm³

Volume of larger cube = ?

Solution:

The mass of larger iron is twice of smaller iron cube.

It will be 40 g.

Now we will apply the density formula.

d = m/v

7.87 g/cm³ = 40 g/ v

v = 40 g/ 7.87 g/cm³

v = 5.08 cm³

Rounding answer to nearest whole number is 5cm³.

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Explanation:

I think 20

0 in the photo should be 1, 1, 1

In  1-isopropyl-2-methylcyclohexane, the number of hydrogen atoms is 18, and this is also an isomer of the cyclohexane, there is a methyl group on the first carbon and an isopropyl group on the second carbon in 1-isopropyl-2-methylcyclohexane.

It is significant as it has a methyl group and an isopropyl group, it is an isomer of the cyclohexane, and it is a compound that can exist in multiple forms with different properties, such as in the field of organic chemistry, uses in industry, etc.

Hence, in 1-isopropyl-2-methylcyclohexane, the number of hydrogen atoms is 18, and this is also an isomer of the cyclohexane, there is a methyl group on the first carbon and an isopropyl group on the second carbon in 1-isopropyl-2-methylcyclohexane.

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Answer:

0.013

Explanation:

Answer:

Explanation:

The names Px, Py and Pz, indicate the orientation of the orbital in space. The key difference between Px Py and Pz orbitals is that Px orbital has two lobes oriented along the x-axis and Py orbital has two lobes oriented along the y-axis whereas Pz orbital has two lobes oriented along the z-axis.

Answer:

Px can stand for Picture Pixel Prescription Prognosis Post Exchange or Physical Exam Personal Exchange Price.

Pz can stand for Precautionary Zone

Py can stand for Program Year or Python

Explanation:

hope this helps

Answer: The sum of all outputs must equal the input:

Explanation:

Answer:

A is the correct answer

Answer:

Ozone (O3) Nitrogen dioxide (NO2) Carbon monoxide (CO) Sulphur dioxide (SO2)

Explanation:

Answer:

Particulate matter (PM10 and PM2. ...

Ozone (O3)

Nitrogen dioxide (NO2)

Carbon monoxide (CO)

Sulphur dioxide (SO2)

Explanation:

Particulate matter (PM10 and PM2. ...

Ozone (O3)

Nitrogen dioxide (NO2)

Carbon monoxide (CO)

Sulphur dioxide (SO2)

Answer:

CuO

Explanation:

Copper(II) oxide is a metal oxide it has the formula CuO.  It has formula of copper(2+). Cupric oxide, or copper (II) oxide

Answer:

0.188 moles of copper and 0.376 moles of silver nitrate

Explanation:

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Let's see

[tex]\\ \rm\rightarrowtail Cu+AgNO_3\longrightarrow Cu(NO_3)_2+Ag[/tex]

Moles of silver :-

Answer:

Explanation:

It can be written as: V = nRT/P. "P" is pressure, "V" is volume, n is the number of moles of a gas, "R" is the molar gas constant and "T" is temperature. Record the molar gas constant "R". R = 8.314472 J/mole x K.

Answer: The theory explains the phenomenon based on certain criteria while the paradigm provides the background or the frame that allows a theory to be tested and measured.

Explanation:

Answer:

The bonds between atoms in the reactants are rearranged to form new compounds in chemical reactions, but none of the atoms disappear and no new ones are formed. As a consequence, chemical equations must be balanced, meaning that the number and kinds of atoms must be the same on both sides of the reaction arrow.

Answer:

The Law of Conservation of Mass states that mass is neither created nor destroyed, it only changes.

So when you balance a chemical equation, what you get is the same equation, but with the same number of atoms of each chemical element in the reactants and in the products. In this way the conservation of mass is achieved, because the same number of atoms that exists in the reactants is the one that is later transformed and appears in the products.

A balanced equation is the following:

H2 + 1/2O2 --------> H2O

Reactants: Products:

Amount of H = 2 Amount of H = 2

Amount of O = 1 Amount of O = 1

It is a balanced equation because each element has the same number of atoms in the reactants and in the products.

Explanation:

If I help you give me points, thanks.

Answer:

ΔH = -162.5 kJ.

Explanation:

Hello.

In this case, we first rearrange the reactions:

ClO(g) + O₃(g) ⇒ Cl(g) + 2O₂(g);  ΔH =-122.8 kJ

2O₃(g) ⇒ 3O₂(g);  ΔH=-285.3 kJ

O₃(g) + Cl(g) ⇒ ClO(g) + O₂(g);  ΔH= ?

Thus, we are going to use the Hess law, as an strategy to rearrange the known chemical reactions and thereby compute the enthalpy of reaction of the unknown one.

1. The first reaction must be inverted in order to obtain chlorine as a reactant in the third one, therefore, the enthalpy of reaction becomes positive:

Cl(g) + 2O₂(g) ⇒ ClO(g) + O₃(g);   ΔH = 122.8 kJ

2. Second reaction remains the same:

2O₃(g) ⇒ 3O₂(g);  ΔH=-285.3 kJ

Then, we add them to obtain:

Cl(g) + 2O₂(g) + 2O₃(g) ⇒ ClO(g) + O₃(g) + 3O₂(g)

Whereas we can subtract both oxygen and ozone to obtain the third one:

O₃(g) + Cl(g) ⇒ ClO(g) + O₂(g)

Therefore, the enthalpy of reaction turns out:

ΔH = 122.8 kJ + (-285.3 kJ )

ΔH = -162.5 kJ.

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Answer:

The atomic mass of element is 65.5 amu.

Explanation:

Given data:

Abundance of X-63 = 50.000%

Atomic mass of  X-63 = 63.00 amu

Atomic mass of X-68 = 68.00 amu

Atomic mass of element = ?

Solution:

Abundance of X-68 = 100-50 = 50%

Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)  / 100

Average atomic mass  = (50×63)+(50×68) /100

Average atomic mass =  3150 + 3400 / 100

Average atomic mass  = 6550 / 100

Average atomic mass = 65.5 amu.

The atomic mass of element is 65.5 amu.

Answer:

Explanation:

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The volume in of a 0.600 M NaCl solution that contains 0.00123 moles of NaCl is 2.05mL

The volume of a substance can be calculated using the following expression:

molarity = no. of moles ÷ volume

According to this question, a 0.600 M NaCl solution contains 0.00123 moles of NaCl.

volume = 0.00123 moles ÷ 0.600 M

volume = 0.00205L

Therefore, the volume in of a 0.600 M NaCl solution that contains 0.00123 moles of NaCl is 2.05mL.

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