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Katen [24]
3 years ago
12

When a 0.4500 g sample of impure potassium chloride was dissolved in water and treated with an excess ofsilver nitrate, 0.8402 g

of silver chloride was precipitated. Calculate the percentage KCl in the original sample.
Chemistry
1 answer:
Svetllana [295]3 years ago
5 0

Answer:

97.78% KCl in the original sample

Explanation:

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The half-life of a positron is very short. It reacts with an electron, and the masses of both are converted to two gamma-ray pho
sp2606 [1]

Explanation:

(a)   It is known that relation between energy and mass is as follows.

            E = 2 \times mc^{2}

where,    E = energy

              m = mass

              c = speed of light = 3 \times 10^{8} m/s

As it is given that mass is 9.109 \times 10^{-31} kg. So, putting the given values into the above formula as follows.

             E = 2 \times mc^{2}

                       = 2 \times 9.109 \times 10^{-31} kg \times 3 \times 10^{8}m/s

                       = 1.638 \times 10^{-13} J

Therefore, we can conclude that the energy produced by the reaction between one electron and one positron is 1.638 \times 10^{-13} J.

(b) When gamma ray photons are produced then they will have the same frequency. Relation between energy and frequency is as follows.

                    E = h \times \nu   ..... (1)

where,     h = plank's constant = 6.626 \times 10^{-34} J.s

              \nu = frequency

Also,     E = 2 \times mc^{2} ........ (2)

Hence, equating equations (1) and (2) as follows.

                    h \times \nu = 2 \times mc^{2}        

So,    

6.626 \times 10^{-34} Js \times \nu = 1.638 \times 10^{-13} J

                           \nu = 1.236 \times 10^{20} Hz

Thus, we can conclude that the frequency is 1.236 \times 10^{20} Hz.

5 0
3 years ago
A driver blows 0.75 -L air bubble 10 m under water. As it rises to the surface, the pressure goes from 2.25 atm to 1.03 atm. Wha
kakasveta [241]

Answer:

1.64 L

Explanation:

P₁V₁ = P₂V₂

P₁ = 2.25 atm

V₁ = 0.75 L

P₂ = 1.03 atm

V₂ = ?

(2.25 atm)(0.75 L) = (1.03 atm)V₂

[(2.25 atm)(0.75 L)]/(1.03 atm) = V₂

V₂ = 1.64 L

3 0
3 years ago
The shape of a molecule is trigonal planar. How many electron domains around the central atom does this molecule most likely hav
r-ruslan [8.4K]

There are three electron domains around the central atom. In a trigonal planar geometry, the central atoms is bonded to three other atoms or groups.

I hope I was able to answer your question. Have a good day. Thank you. 

3 0
3 years ago
Read 2 more answers
The wavelength of light from an electronic billboard is 4.89
strojnjashka [21]

Answer:

Frequency = 6.13x10⁻³s⁻¹

Explanation:

The wavelength is defined as the ratio between speed of light (3x10⁸m/s) and the frequency of the wave:

Wavelength = Speed of light / frequency

Frequency = Speed of light / wavelength

Frequency = 3x10⁸m/s / 4.89x10¹⁰m

<h3>Frequency = 6.13x10⁻³s⁻¹</h3>
8 0
3 years ago
Complete the chemical name of the compound CoI3
amid [387]

Answer:

Cobalt (III) Iodide

General Formulas and Concepts:

<u>Chemistry - Compounds</u>

  • Reading a Periodic Table
  • Writing Compounds
  • Naming Compounds

Explanation:

<u>Step 1: Define</u>

CoI₃

<u>Step 2: Identify</u>

Co is a Transition Metal, has either a charge of 2+ or 3+

I is a Halogen, has a charge of 1-

<u>Step 3: Write name</u>

We need to balance the charges, and in order to do that, we must have a Co³⁺

Cobalt (III) Iodide

8 0
2 years ago
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