CHEMISTRY COLLEGE

What mass of Nz will be needed to produce 31.5 grams of N2O5?4N2 + 502 --> 2N2O5
a) 158.3 grams
b) 38.64 grams
c) 4.96 grams
d) 16.34 grams

Answers

Answer 1
Answer:

Answer: d) 16.34 grams

Explanation:

To calculate the moles :

\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}  

\text{Moles of} N_2O_5=(31.5g)/(108.01g/mol)=0.292moles

The balanced chemical reaction given is:

4N_2+5O_2\rightarrow 2N_2O_5  

According to stoichiometry :

As 2 moles of N_2O_5 are produced by= 4 moles of N_2

Thus 0.292 moles of N_2O_5 are produced by=  =(4)/(2)* 0.292=0.584moles of N_2

Mass of N_2=moles* {\text {Molar mass}}=0.584moles* 28g/mol=16.34g

Thus 16.34 g of N_2 will be needed

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Which of the following is not a reason why chemical bonds are important
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In addition to displacing halide ions, the acetylide ion also adds to carbonyl groups. 2-Methyl-3-butyn-2-ol (MBI) is an acetylenic alcohol used in the manufacture of products for the agrochemical and specialty chemical industry. It can be synthesized by the addition of acetylene to acetone to form the alkoxide ion and, as a second step, protonation of the alkoxide ion to produce the alcohol. Complete the mechanism for 2-methyl-3-butyn-2-ol production by drawing in the products of each step and the missing curved arrows. Sodium amide deprotonates the terminal alkyne to form sodium ethynide. Draw all missing reactants and/or products in the appropriate boxes by placing atoms on the canvas and connecting them with bonds. Add charges where needed. Electron flow arrows should start on an atom or a bond and should end on an atom, bond, or location where a new bond should be create

I need soon this is due at 10:30 pm its curently 6:00 pm
What is parasitism?

Answers

Answer:

the practice of living as a parasite in or on another organism.

Hope this HELPS!!!

Explanation:

Essentially all of the mass of an atom is due to the ______.(A) electrons.(B) neutrons.(C) nucleons.(D) protons.

Answers

Answer:

Atom is made up of NUCLEUS and electrons revolving around nucleus.

Nucleus itself contains protons and neutrons. Protons and neutrons are approximately 1680 times heavier than the electrons. So the major contribution to the mass of an atom comes from the nucleus.

Final answer:

The mass of an atom is mostly carried by the nucleons, protons, and neutrons, in its nucleus. Electrons contribute very little to the overall mass of an atom because of their small mass.

Explanation:

Essentially, all of the mass of an atom is due to the nucleons. An atom is primarily composed of protons, neutrons, and electrons. However, the mass of an electron is so small that it contributes very little to the overall mass of an atom. The term 'nucleons' refers to the particles in the nucleus of an atom, namely the protons and neutrons. These particles carry most of the atom's mass given their relatively large mass compared to electrons.

Learn more about Atomic Mass here:

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Calculate the energies of one photon of ultraviolet (λ = 1 x 10⁻⁸ m), visible (λ = 5 x 10⁻⁷ m), and infrared (λ = 1 x 10⁴ m) light. What do the answers indicate about the relationship between the wavelength and energy of light?

Answers

Answer:

  • Energy of ultraviolet light is 19.878 10⁻¹⁸ J
  • Energy of visible light is 3.9756 X 10⁻¹⁹ J
  • Energy of infrared light is 19.878 X 10⁻³⁰ J

The answers indicate that wavelength is inversely proportional to the energy of light (photon)

Explanation:

Energy of photon E = hc/λ

where;

h is Planck's constant = 6.626 X 10⁻³⁴js

c is the speed of light (photon) = 3 X 10⁸ m/s

λ is the wavelength of the photon

⇒For ultraviolet ray, with wavelength λ = 1 x 10⁻⁸ m

E = (6.626 X 10⁻³⁴ X 3 X 10⁸)/ (1 x 10⁻⁸)

E = 19.878 10⁻¹⁸ J

⇒For Visible light, with wavelength λ = 5 x 10⁻⁷ m

E = (6.626 X 10⁻³⁴ X 3 X 10⁸)/ (5 x 10⁻⁷)

E = 3.9756 X 10⁻¹⁹ J

⇒For Infrared, with wavelength λ = 1 x 10⁴ m

E = (6.626 X 10⁻³⁴ X 3 X 10⁸)/ (1 x 10⁴)

E = 19.878 X 10⁻³⁰ J

From the result above, ultraviolet ray has the shortest wavelength, but it has the highest energy among other lights.

Also infrared has the highest wavelength but the least energy among other lights.

Hence, wavelength is inversely proportional to the energy of light (photon).

Which response gives the products of hydrolysisofNH4Cl?
A. NH4+ + HCl
B. NH3 + OH- + HCl
C. NH3 + H+
D. NH4OH + HCl
E. No hydrolysis occurs.

Answers

Answer : The correct option is, (C) NH₃ + H⁺

Explanation:

Hydrolysis : It is defined as the chemical reaction in which the breakdown of compound takes place due to reaction with water.

As per question:

First ammonium chloride completely dissociates into ion.

NH_4Cl(aq)\rightarrow NH_4^+(aq)+Cl^-(aq)

Now ammonium ion react with water to give ammonia and hydronium or hydrogen ion.

The balanced hydrolysis reaction will be:

NH_4^++H_2O\rightarrow NH_3+H_3O^+

Hence, the correct option is, (C) NH₃ + H⁺

Answer:

NH₃ and H⁺

Explanation:

The dissociation of NH₄Cl will lead to two ions , i.e. , NH⁴⁺  and Cl⁻ .

Hence , the reaction is -

NH₄Cl  →  NH⁴⁺   +   Cl⁻

We can conclude that  NH₄Cl can be formed from the ions , NH⁴⁺  and Cl⁻

Hence ,

According to the reaction ,

NH⁴⁺ + H₂O  ⇆  NH₃ + H₃O⁺

Therefore ,

The reactant that will lead to the formation of NH₄Cl are -  NH₃ and H⁺

What is the pOH of a 7.9 x 10 ^-4 M OH- solution?

pOH= ?

Answers

Answer: pOH of the given hydroxide ion concentration is 3.10

Explanation:

pOH is defined as the negative logarithm of hydroxide ion concentration. It is represented by the equation:

pOH=-\log[OH^-]

We are given:

Hydroxide ion concentration, [OH^-]=7.9* 10^(-4)M

Putting values in above equation, we get:

pOH=-\log(7.9* 10^(-4))\n\npOH=3.10

Hence, pOH of the given hydroxide ion concentration is 3.10

pOH is defined as -log([OH-]).

pOH = -log([OH-]) = -log(7.9 * 10^-4) = 3.1

Hope this helps!

A piston confines 0.200 mol Ne(g) in 1.20 at 25 degree C. Two experiments are performed. (a) The gas is allowed to expand through an additional 1.20 L against a constant of 1.00atm. (b) The gas is allowed to expand reversibly and isothermally to the same final volume. Please calculate the work done by the gas system in these two processes, respectively. Which process does more work? (revised from 6/e exercise 8.11) Please show calculation details.

Answers

Answer:

The second experiment (reversible path) does more work

Explanation:

Step 1:

A piston confines 0.200 mol Ne(g) in 1.20L at 25 degree °C

(a) The gas is allowed to expand through an additional 1.20 L against a constant of 1.00atm

Irreversible path: w =-Pex*ΔV

⇒ with Pex = 1.00 atm

⇒ with ΔV = 1.20 L

W = -(1.00 atm) * 1.20 L

W = -1.20L*atm *101.325 J /1 L*atm = -121.59 J

(b) The gas is allowed to expand reversibly and isothermally to the same final volume.

W = -nRTln(Vfinal/Vinitial)

⇒ with n = the number of moles = 0.200

⇒ with R = gas constant = 8.3145 J/K*mol

⇒ with T = 298 Kelvin

⇒ with Vfinal/Vinitial  = 2.40/1.20 = 2

W = -(0.200mol) * 8.3145 J/K*mol *298K *ln(2.4/1.2)

W = -343.5 J

The second experiment (reversible path) does more work
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