How many moles are in 9.8 x 1024 atoms of calcium?

Answer:

315 mL

General Formulas and Concepts:

[tex]Molarity=\frac{moles \hspace{3} of \hspace{3} solute}{liters \hspace{3} of \hspace{3} solution}[/tex]

Explanation:

Step 1: Define variables

0.555 M NaHCO₃

14.7 g NaHCO₃

Step 2: Define conversions

Molar Mass of Na - 22.99 g/mol

Molar Mass of H - 1.01 g/mol

Molar Mass of C - 12.01 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of NaHCO₃ - [22.99 + 1.01 + 12.01 + 3(16.00)] g/mol = 84.01 g/mol

1 L = 1000 mL

Step 3: Find moles of solute

[tex]14.7 \hspace{3} g \hspace{3} NaHCO_3(\frac{1 \hspace{3} mol \hspace{3} NaHCO_3}{84.01 \hspace{3} g \hspace{3} NaHCO_3} )[/tex] = 0.174979 mol NaHCO₃

Step 4: Find amount of solution

[tex]0.555 \hspace{3} M \hspace{3} NaHCO_3=\frac{0.174979 \hspace{3} mol \hspace{3} NaHCO_3}{x \hspace{3} L}[/tex]

[tex]0.555 \hspace{3} M \hspace{3} NaHCO_3(x \hspace{3} L)=0.174979 \hspace{3} mol \hspace{3} NaHCO_3[/tex]

[tex]x \hspace{3} L=\frac{0.174979 \hspace{3} mol \hspace{3} NaHCO_3}{0.555 \hspace{3} M \hspace{3} NaHCO_3}[/tex]

[tex]x \hspace{3} L=0.315278[/tex]

Step 5: Convert

[tex]0.315278 \hspace{3} L(\frac{1000 \hspace{3} mL}{1 \hspace{3} L} )[/tex] = 315.278 mL

Step 6: Simplify

We are given 3 sig figs.

315.278 mL ≈ 315 mL

Answer:

Mass = 23.232 g

Explanation:

Given data:

Mass of C₈H₁₈ = 7.58 g

Mass of CO₂ produced = ?

Solution:

Chemical equation:

2C₈H₁₈ + 25O₂      →     16CO₂ + 18H₂O

Number of moles of octane:

Number of  moles =  mass/molar mass

Number of moles = 7.58 g/ 114.23 g/mol

Number of moles = 0.066 mol

Now we will compare the moles of CO₂ with octane from balance chemical equation.

                  C₈H₁₈            :           CO₂

                       2              :              16

                 0.066             :           16/2×0.066 = 0.528

Mass of CO₂ produced:

Mass = number of moles × molar mass

Mass = 0.528 mol × 44 g/mol

Mass = 23.232 g

Answer:

mixture

Explanation:

Kool-Aid  is a mixture of sugar, water, dye, and flavoring.

Answer:

Changes in environment, food source changes and disease?

Explanation:

I dont know what the answer choices are

Answer:

changes in the environment

Explanation:

like digging big holes.

Hope this helps!

Answer:

yah it was one of my best I've ever had

Answer:

Yah

Explanation:

Dull black surface are good absorbers of radiation.

The process by which energy in the form of electromagnetic radiation is emitted by a heated surface and travels directly to its absorption point at the speed of light.

The rate at which a body absorbs or radiates thermal radiation relies upon the nature of the surface as well.

According to the Kirchhoff's radiation law, the objects, which are good emitters are also good absorbers.

A blackened surface is an excellent absorber as well as an excellent emitter.

A black body refers to a body, which is regarded as a perfect radiator and absorber of electromagnetic radiations, a dull black surface is a good absorber of heat radiation.

Thus, dull black surface is the best surface for absorbing heat radiation.

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Answer:

its C and D

C. The brown substance is molecular

D. The blue substance is ionic

Explanation:

did the test !

Two correct statements are B) The silver substance is ionic

C) The brown substance is molecular.

Silver is a chemical element with the symbol Ag and atomic wide variety 47. categorized as transition steel, Silver is stable at room temperature.

It is a molecular substance, that's a substance with or more atoms, the smallest gadgets of remember joined together via a covalent bond. A covalent bond is a hyperlink created via the sharing of electrons that holds these atoms collectively.

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Answer:

- carbon (C)

- hydrogen (H)

- oxygen (O)

- nitrogen (N)

- sulfur (S)

Explanation:

Amino acids are organic molecules which base chemical structure is composed by:

- a carbon atom (C)

- a carboxyl group (-COOH)

- an amino group (-NH₂)

- a side chain- called R group- which varies in different amino acids. It can be composed by N, H, O, C and sometimes S.

According to this, the five chemical elements that are present in amino acids are:

- carbon (C)

- hydrogen (H)

- oxygen (O)

- nitrogen (N)

- sulfur (S)

Answer:

215.51 g of O2.

Explanation:

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

2KClO3 —> 2KCl + 3O2

Next, we shall determine the mass of KClO3 that decomposed and the mass of O2 produced from the balanced equation. This is illustrated below:

Molar mass of KClO3 = 39 + 35.5 + (16×3)

= 39 + 35.5 + 48

= 122.5 g/mol

Mass of KClO3 from the balanced equation = 2 × 122.5 = 245 g

Molar mass of O2 = 16 × 2 = 32 g/mol

Mass of O2 from the balanced equation = 3 × 32 = 96 g

From the balanced equation above,

245 g of KClO3 decomposed to produce 96 g of O2.

Finally, we shall determine the mass of O2 produced by the decomposition of 550 g of KClO3. This can be obtained as follow:

From the balanced equation above,

245 g of KClO3 decomposed to produce 96 g of O2.

Therefore, 550 g of KClO3 will decompose to produce =

(550 × 96)/245 = 215.51 g of O2.

Therefore, 215.51 g of O2 were obtained from the reaction.

Answer:

The ball's kinetic energy is transforming to potential energy.

Explanation:

the ball is stopping resulting in potential energy

Answer:

Explanation:

Alkanes are saturated hydrocarbons (i.e they do not have any double/triple bond within there carbon chain). They have the general formula CₙH₂ₙ₊₂ where n is the number of carbons and starts with 1.

Since the predominant alkane in the olive has 27 carbons, it's molecular formula will be C₂₇H₍₂ₓ₂₇₎₊₂ ⇒ C₂₇H₅₆

The major alkane component in the olive leaves has 31 carbons, hence it's molecular formula will be C₃₁H₍₃₁ₓ₂₎₊₂ ⇒ C₃₁H₆₄

Answer:

metamorphic rock from heat and pressure

Answer:

C) Reactants absorb a minimum amount of energy and then release a smaller  

amount of energy as products form.

Explanation:

The statement that best describes how to read a reaction pathway from the graph of an endothermic reaction is that, reactants absorb a minimum amount of energy and then release a smaller amount of energy as products form.

In an endothermic change, heat is absorbed from the surrounding.

Answer:

1st one

Explanation:

Answer: Matter can be broken down into two categories: pure substances and mixtures. Pure substances are further broken down into elements and compounds. Mixtures are physically combined structures that can be separated into their original components. A chemical substance is composed of one type of atom or molecule :)!

Answer:

the second answer its science behind it

Answer:

b

Explanation:

Answer:

The concentration is  [tex]   [Cu^{2+}]_a  = 10^{-10.269} [/tex]  

Explanation:

From the question we are told that

    The voltage of the cell is  [tex]E =  0.22 \  V[/tex]

Generally the reaction at the cathode is  

  [tex]Cu^{2+} _{(aq)} + 2e^{-} \to  Cu_{s}[/tex] the half cell voltage is  V_c =  0.337 V

Generally the reaction at the anode is    

   [tex]Cu _{(s)} \to Cu^{2+} _{(aq)} +  2e^{-}[/tex]  the half cell voltage is  V_a = -0.337 V

Gnerally the reaction of the cell is  

    [tex]Cu_{(s)} + Cu^{2+} _{(aq)} \to Cu^{2+}_{(aq)} +  Cu_{(s)}[/tex]

At initial the voltage is  V  =  0 V

Generally the voltage of the cell at 25°C is  

       [tex]E =  V  - \frac{0.0591}{n} log \frac{[Cu^{2+}] _a}{[Cu^{2+}]_c}[/tex]

Here n is number of  of electron and it is 2

So from the question we are told that one cell has a concentration 1.5 x 10-3 M

Let assume it is  [tex][Cu^{2+}]_c[/tex]

So

      [tex]0.22=  0  - \frac{0.0591}{2} log \frac{[Cu^{2+}] _a}{  1.5 * 10^{-3} }[/tex]

=>    [tex]-7.445 =     log \frac{[Cu^{2+}] _a}{  1.5 * 10^{-3} }[/tex]

=>  [tex]-7.445 =     log [Cu^{2+}_a] - log [1.5*10^{-3}][/tex]

=>    [tex]-7.445  + log [1.5*10^{-3} =     log [Cu^{2+}_a] [/tex]

=>    [tex]-7.445  - 2.824 =     log [Cu^{2+}_a] [/tex]

Taking the antilog

=>    [tex]   [Cu^{2+}]_a  = 10^{-10.269} [/tex]    

=>     [tex]   [Cu^{2+}]_a  = 5.38 *10^{-11} \  M  [/tex]  

Answer:

D

Explanation:

Identifying unique features of evidence

A laboratory is a place where scientific investigations and experiments are conducted. Observing a phenomenon in the lab includes identifying unique features of evidence. Thus, option D is correct.

An observation is said to be the deduction that is seen or heard and is due to the actions of the process or event that are gained from the information from a conducted experiment.

It is an important factor in an experiment and research and is used in the lab to falsify or prove the hypothesis. It is made based on the experimental setup and involves various steps.

The observations are used to draw conclusions and inferences based on the detailed identification of the characteristics of the evidence. The evidence supports the observation.

Therefore, option D. the features of evidence are the correct option.

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The question is incomplete, the complete question is;

A 8.00 L tank at 2.64 °C is filled with 9.82 g of chlorine pentafluoride gas and 10.1 g of dinitrogen difluoride gas. You can assume both gases behave as ideal gases under these conditions. Calculate the mole fraction and partial pressure of each gas, and the total pressure in the tank. Be sure your answers have the correct number of significant digits.

Answer:

See explanation for details

Explanation:

Number of moles of N2F2 = mass/ molar mass

Molar mass of N2F2 = 66 g/mol

Number of moles = 10.1 g/66 = 0.15 moles

Number of moles of ClF5 = 9.82 g/130 g/mol= 0.08 moles

Molar mass of ClF5= 130g/mol

Total number of moles = 0.15 moles + 0.08 moles = 0.23 moles

Given that;

T= 2.64 °C + 273 = 275.64 K

n= 0.23 moles

R= 0.082 Latmmol-1K-1

V= 8.00 L

P= ??

From;

PV =nRT

P= nRT/V

P= 0.23 ×0.082 × 275.64/8.00

P= 0.65 atm

Mole fraction of N2F2= 0.15/0.23 = 0.65

Partial pressure = mole fraction × total pressure = 0.65 × 0.65 = 0.42 atm

Mole fraction of ClF5 = 0.08/0.23 = 0.35

Partial pressure of ClF5 = mole fraction × total pressure = 0.35 × 0.65 = 0.22 atm

Answer:

CHO

Explanation:

Carbon = 41%,  Hydrogen = 4.58%, oxygen = 54.6%

Step 1:

Divide through by their respective relative atomic masses

41/ 12,         4.58/1,         54.6/16

3.41              4.58            3.41

Step 2:

Divide by the lowest ratio:

3.41/3.41,      4.58/3.41,     3.41/3.41

1,                    1,                  1

Hence the empirical formula is CHO

Answer:

The empirical formula of X is C3H4O3.

Explanation:

Answer:

Explanation:

pH = 10.3

[ H] = 10⁻¹⁰°³

= 5 x 10⁻¹¹ M

concentration of CsOH C = 3 M

pKa of carbonate = 6.35

Ka = 10⁻⁶°³⁵ = 4.46 x 10⁻⁷

Buffer capacity = 2.303 x C x Ka x [ H⁺] / ( Ka + [ H⁺]² )²

= 2.303 x 3 x 4.46 x 10⁻⁷  x 5 x 10⁻¹¹ / ( 4.46 x 10⁻⁷  + 25 x 10⁻²² )²

= 154 x 10⁻¹⁸ / 19.9 x 10⁻¹⁴

= 7.74 x 10⁻⁴ .

Answer:

1.02M

Explanation:

The first thing to do is to write out the balanced chemical reaction out.

Therefore, the chemical equation for the chemical reaction is given below as:

CO + H₂O <------------------------------------------------------------------------------> CO₂ + H₂.

The molarity of CO = 1.8/O.25 = 7.2M, the molarity of H2O = 0.5 × 4 = 2 m and the molarity of CO2 is 1.6 × 4 =6.4 M.

Therefore at equilibrium we have that the molarity of CO = (7.2 - x)M, the molarity of CO2 at equilibrium = (6.4 + x)M, the molarity of Hydrogen at equilibrium = x M and the molarity of H2O  at equilibrium = ( 2 - x) M.

Hence, the equilibrium constant is given as, Kc = 0.152 = [CO2][H2]/[CO][H2O].

The equilibrium constant = 0.152 = [6.4 + x][x]/[7.2 - x][2 - x].

Solving for the quadratic equation gives the value of x as equals to= 0.981.

Therefore, the equilibrium molarity of H2O = 2 - 0.981 = 1.019 = 1.02M

Answer:

A

Explanation:

Nuclear fusion is a much more powerful reaction than any of the others.

Nuclear fusion of two hydrogen isotopes would expect to produce the most energy. Therefore, option (A) is correct.

Nuclear fusion can be defined as when two or more nuclei fuse together to form a single heavier nucleus. In this reaction, the matter is generally not conserved due to some of the mass of the nuclei being converted to energy.

For nuclear fusion, the nuclei must be brought closer to the reaction occurring. Each star in the universe, including sun, is shining due to nuclear fusion reactions. They produce large amounts of energy in this process.

In the Sun's core, hydrogen nuclei are get transformed into helium nuclei which are known as nuclear fusion. It takes place when four hydrogen nuclei fuse into each helium nucleus. During the Nuclear fusion process, some of the mass of hydrogen nuclei is transformed into energy.

Therefore, nuclear fusion is where hydrogen atoms combined to form helium to produce the most energy.

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Answer:

See explanation

Explanation:

Friedel-Crafts alkylation frequently undergo polysubstitution because the process  leads to the addition of an electron donating alkyl group, which activates the benzene ring to further alkylation. The acyl group rather deactivates the ring towards electrophilic substitution.

When benzene is reacted with t-butyl chloride, the chief disubstituted product is the para rather than ortho isomer because the increased bulk of the tert-butyl group hinders attack at the ortho-sites.

Answer:

d. Pergoldic acid

Explanation:

chlorate = ClO₃⁻

Goldate GoO₃⁻

On this basis we can infer that HClO₄ and HGoO₄ will be similar .

HClO₄ is called perchloric acid , hence HGoO₄ will be called pergoldic acid.