How many protons, electrons, and neutrons? ANSWEN
2+
23
6521
26
Protons
Electrons
Neutrons
28
30
65
3-
31
Protons
Electrons
Neutrons
"As
57 Fe
32
3+
33
35
36
DRAGO
Protons
Electrons
Neutrons
14
ME
US

Answer:

NH4NO2.

Explanation:

Hello!

In this case, since the by-mass percent of any element (in this case nitrogen) is computed by:

[tex]\%N=\frac{n_N*m_N}{M}*100\%[/tex]

Whereas n is the number of N in the compound, m the atomic mass of nitrogen (14.01 g/mol) and M the molar mass of the compound. Thus, down below we can find the molar mass of each compound and the by-mass percent of nitrogen:

NH4NH2CO2  = 78.07 g/mol

[tex]\%N=\frac{2*14.01}{78.07}*100\%=35.9\%[/tex]

NH4NO2  = 64.06 g/mol

[tex]\%N=\frac{2*14.01}{64.06}*100\%=43.7\%[/tex]

N2O3  = 76.01 g/mol

[tex]\%N=\frac{2*14.01}{76.01}*100\%=36.9\%[/tex]

NH4Cl  = 53.49 g/mol

[tex]\%N=\frac{1*14.01}{53.49}*100\%=26.2\%[/tex]

NH2OH = 33.03 g/mol

[tex]\%N=\frac{1*14.01}{33.03}*100\%=42.4\%[/tex]

In such a way, the compound with the highest percentage of nitrogen by mass is NH4NO2.

Best regards!

Answer:

NH4NO2

Explanation:

The answer is the 2ndone

NH4NO2

Answer:

Following are the solution to the given question:

Explanation:

Due to the strong attachment among ions, it's indeed hard to break the covalent compounds in a combination. The ionic compounds, as they have a great melting point, become solid at room temperature, and may we say that the stronger between both the ions, as it is on a high point of fusion, is quite desirable.

Answer:

D, D, A

Explanation:

Answer:

A heterogeneous catalyst can be easily separated from reactants.

Explanation:

Answer:

A magnesium atom must lose two electrons to have the same number electrons as an atom of the previous noble gas, neon. Thus, a magnesium atom will form a cation with two fewer electrons than protons and a charge of 2+. The symbol for the ion is Mg2+, and it is called a magnesium ion.

Answer:

pH = 2.98

Explanation:

pKa of HNO2 is 3.35

HNO2 reacts with NaOH as follows:

HNO2 + NaOH → NaNO2 + H2O

Where moles of NaOH added are equal to NaNO2 produced

And initial moles of HNO2 - Moles NaOH = Moles HNO2

Initial moles HNO2:

0.0200L * (0.10mol/L) = 0.00200moles HNO2

Moles NaOH = Moles NaNO2:

0.0100L * (0.10mol/L) = 0.00100 moles NaOH = Moles NaNO2

Moles HNO2:

0.00200moles - 0.00100moles = 0.00100 moles HNO2

Then, the added HCl reacts with NaNO2 producing HNO2:

HCl + NaNO2 → HNO2 + NaCl

Where moles added of HCl are moles of HNO2 produced and initial moles  of NaNO2 - moles of HCl = Moles NaNO2

Moles HCl:

4x10⁻⁵L * (10.0mol / L) = 0.00040moles HCl = Moles of HNO2 produced

Moles HNO2:

0.00100moles + 0.0004moles = 0.0014moles HNO2

Moles NaNO2:

0.00100moles - 0.0004moles = 0.0006moles NaNO2

With these moles and H-H equation we can solve for the pH of the buffer:

pH = pKa + log [NaNO2] / [HNO2]

Where pH is pH of the buffer

pKa is pKa of HNO2: 3.35

[] are moles of each species:

Replacing:

pH = 3.35 + log [0.0006moles NaNO2] / [0.0014moles HNO2]

Answer:

0.6022×10²³ molecules

Number of moles = 0.1 mol

Explanation:

Given data:

Mass of HCl = 3.65 g

Number of molecules = ?

Number of moles = ?

Solution:

Number of moles:

Number of moles = mass/molar mass

Number of moles = 3.65 g/36.45 g/mol

Number of moles = 0.1 mol

Number of molecules:

1 mole of any substance contain 6.022×10²³ molecules

0.1 mol ×  6.022×10²³ molecules/ 1 mol

0.6022×10²³ molecules

Answer:

For you first question about the defined function program:

if ( v ≤ 250 ) {

   set p to (5 + v*.02)

}

elseif ( 250 ≤ v ≤ 800 ) {

   set p to (5 + 2500 + (v - 250)*.02)

}

else {

   set p to (5 + 28000 + (v - 800)*.1)

}

This function will first check if the user has used how many units and decide which category that user falls into.

Then, it uses that information to execute a command to calculate how much money that user should pay for the electricity bill, factoring in the extra demands from the question.

For your second question:

(5 + 2500 + (700 - 250)*.02)

= (3000 + 450*.02)

= (3000 + 9)

= 3009

The customer should have paid 3009 dollars.

Explanation:

Hope this helped!

Answer:

True

Explanation:

Methylcyclohexane has a cyclic compound of 7 carbons false classified as Saturated Hydrocarbon.

Answer:

[tex]M_{K^+}=2.1M[/tex]

Explanation:

Hello!

In this case, since we know the initial and final concentrations and the added volume of water, we can write:

[tex]3.50M*V_1=0.700M(0.210L+V_1)[/tex]

Which can be solved for the initial volume as follows:

[tex]3.50M*V_1-0.700M(0.210L+V_1)=0\\\\3.50V_1-0.147-0.7V_1=0\\\\2.8V_1=0.147\\\\V_1=\frac{0.147}{2.8}=0.0525L[/tex]

It means that the final volume is:

[tex]V_2=0.210L+0.0525L=0.2625L[/tex]

Next, we compute the moles of potassium phosphate in solution:

[tex]n_{K_3PO_4}=0.2625L*0.700\frac{molK_3PO_4}{L}=0.184molK_3PO_4[/tex]

Then, since 1 mol of potassium phosphate has 3 moles of potassium (K's subscript), we compute the moles of potassium ions:

[tex]n_{K^+}=0.184molK_3PO_4*\frac{3molK^+}{1molK_3PO_4}=0.551molK^+[/tex]

Finally, the concentration of potassium ions turns out:

[tex]M_{K^+}=\frac{0.551molK^+ }{0.2625L}\\\\ M_{K^+}=2.1M[/tex]

Regards!

Answer:

A

Explanation:

This is because of the law of conservation of mass.  This means that even if a reaction occurs, the mass will remain the same.

New atoms will not be formed, but new compounds will.

Answer:

it is the unit of Force

Explanation:

force is equal to Newton

Answer:

atoms

Explanation:

atoms combines to form compound

Answer:

8.51 x 10²¹ atoms

Explanation:

Given parameters:

Mass of K = 0.551g

Unknown:

Number of atoms = ?

Solution:

To find the number of atoms in this given substance, we need to solve for the number of moles first.

 Number of moles  = [tex]\frac{mass}{molar mass}[/tex]

 Now;

     Molar mass of K  = 39g/mol

 Number of moles  = [tex]\frac{0.551}{39}[/tex] = 0.014mole

Therefore,

   1 mole of a substance contains 6.02 x 10²³ atoms

  0.014 mole of K will contain 0.014 x 6.02 x 10²³ = 8.51 x 10²¹ atoms

Answer:

0

Explanation:

Ca has 20 electrons

Answer: 1. halve

2. halve

3. double

Explanation:

The relationship between wavelength and energy of the wave follows the equation:

[tex]E=\frac{hc}{\lambda}[/tex]

E= energy

[tex]\lambda [/tex] = wavelength of the wave

h = Planck's constant  

c = speed of light

Thus as wavelength and energy have inverse realation, when wavelength will halve , energy will double.

2. The between wavenumber and energy of the wave follows the equation:

[tex]E=h\times c\times \bar{\nu}[/tex]

E= energy

[tex]\bar{\nu}[/tex][tex]\nubar[/tex] = wavenumber of the wave

h = Planck's constant  

c = speed of light

Thus as wavenumber and energy have direct relation, when wavenumber will halve , energy will be halved.

3. The relationship between energy and frequency of the wave follows the equation:

[tex]E=h\times \nu[/tex]

where

E = energy

h = Planck's constant  

[tex]\nu[/tex] = frequency of the wave

Thus as frequency and energy have direct realation, when frequency will double , energy will double.

The equilibrium concentration of H₂ : c. 9.55 x 10⁻³ M

Given

Kc = 54.6 at 425°C

The concentration of Hl = 0.0706 mol/L

Required

The equilibrium concentration of H₂ (and I₂)

Solution

[tex]\tt Kc=\dfrac{[HI]^2}{[H_2][I_2]}\\\\54.6=\dfrac{0.0706^2}{[H_2][I_2]}[/tex]

[H₂][I₂]=[H₂]²

[tex]\tt [H_2][I_2]=\dfrac{0.0706^2}{54.6}=[H_2]=9.55\times 10^-3~M[/tex]

The gas phase concentration of H2 and I2 is  9.55 x 10-3M.

The equation of the reaction is;

          H2      +       I2 ------>        2HI

We also have the information that the equilibrium constant of the process is  54.6.

Now recall that;

Kc = 2HI/[H2] [I2]

We can assume that the concentration of H2 = concentration of I2

Hence; [H2] = [I2] = x

54.6 = [0.0706]^2/x^2

54.6x^2 =  [0.0706]^2

x = √ [0.0706]^2/54.6

x = 9.55 x 10-3M

Learn more about equilibrium constant: https://brainly.com/question/17960050?

Answer:

The enthalpy of vaporization of H2O is higher than the enthalpy of fusion of H2O, therefore vaporizing the same mass of H2O would require more heat/energy than melting the same mass of H2O.

hope it helps!

It is useful to express a number in scientific notation is it makes large numbers easier to compare and work with. The correct option is B.

Scientific notation is a way of writing mathematical equations easily. It is used when the number is very large, and they are written in decimals. It is a standard form of writing in the United States.

An example is 1.332 x 10-3.

Thus, the correct option is B. It makes large numbers easier to compare and work with.

Learn more about scientific notation, here:

https://brainly.com/question/15361382

#SPJ2

Answer:

17 for chlorine atom ; 18 electrons for a chlorine ion

★Plato/Edmentum users★

The creation of energy through the process of nuclear fusion. ✔

Have a good day fellow cheaters :)♡

Answer:

B

Explanation:

The molecule which has a structure that is most like aspirin is benzene.

Aspirin, also known as acetylsalicylic acid, is a pain reliever, fever reducer, and inflammation reducer.

In the structure of aspirin one aromatic ring is present in which carboxylic group is present and molecular formula of aspirin is written as C₉H₈O₄.

Hence benzene has a structure that is most like aspirin.

To know more about aspirin, visit the below link:

https://brainly.com/question/2070753

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Answer:

12*2= 24

Mg 24 is twice heavier than carbon

Explanation:

The atomic mass of one carbon 12 atom = 12 g/mol

Relative atomic mass [tex](A_{r})[/tex] of an element is the mass of one of its atoms relative to 1/12 the mass of one atom of carbon-12.

Relative atomic mass [tex](A_{r})[/tex] is given by the formula

[tex](A_{r})[/tex] = (Average mass of an atom ×12)/(mass of one atom of carbon-12)

From the question, x is twice heavier as one carbon 12 atom

∴ mass of x = 2 × 12 g/mol

mass of x = 24 g/mol

Then, the relative atomic mass of elements x​ is calculated thus

[tex]A_{r}= \frac{24gmol^{-1} \times 12}{12 gmol^{-1} }[/tex]

[tex]A_{r} = 24 \\[/tex]

Hence, the relative atomic mass of elements x​ is 24.

(NOTE: Relative atomic mass is unitless)

Learn more on relative atomic mass here: https://brainly.com/question/16824270

Answer:

The correct answer is - (a) isobutene.

Explanation:

A 1° or primary hydrogen atom is one that is bonded to a 1° carbon atom; a 2° hydrogen atom is one that is connected to a 2° carbon atom; In isobutene only among all the all option having only primary hydrogen atoms. rest have secondary or teritary hydrogen atoms in them

C1∘H3≡CH: (only 1∘ hydrogen atoms)

Answer:

If I'm correct i believe that the answer is A.

Answer:

A. Where warm moist air masses traveling north collide with cool dry air masses traveling south

Explanation:

I got it right

Answer:

Lathanum .

Atomic number = 57

Symbol = La

Atomic weight = 138.9

No of energy orbitals = 6

Electronic configuration

[tex][Xe]6s^25d^1[/tex]

Explanation:

giving equal opportunity,making good governance, maintaining peace and harmony among people, other try to write by your self

Answer:

–0.16 m

Explanation:

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

Time (t) = 0.18 s

Acceleration due to gravity (g) = –9.81 m/s²

Height (h) =?

We can obtain how far the ruler will fall by using the following equation:

H = ½gt²

H = ½ × –9.81 × 0.18²

H = ½ × –9.81 × 0.0324

H = –0.16 m

Thus, the ruler will fall –0.16 m before you will catch it.

Answer:

Answered below

Explanation:

1) 2Na (s) + 2H2O (l) → 2NaOH (aq) + H2 (g)

2) 2Na (s) + H2 (g) → 2NaH (s)

3) Formula for graphite is C.

Thus;

Na + C → NaC

4) 2Na (s) + O2 (g) → 2Na_2O_2 (s)

5) 2Na (s) + Cl2 (g) → 2NaCl (s)

6) Na + Pb → NaPb

7) Na (s) + NH3 (g) → NaNH2 (s) + H2 (g)