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3 years ago

In the diagram shown, what is occurring at the section marked 4?

Chemistry

1 answer:

astra-53 [7]3 years ago

4 0

You need to show an image of the diagram or else nobody knows what you’re referring to.

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2. A solution is made by adding 1.23 mol of KCl to 1000.0 g of water. Assume that the

ladessa [460]

Answer:

a. 74.55 g/mol.

b. 91.70 g.

c. 8.40%.

d. 1.23 mol/L.

Explanation:

a. Calculate the formula weight of KCl.

∵ Formula weight of KCl = atomic weight of K + atomic weight of Cl

atomic weight of K = 39.098 g/mol, atomic weight of Cl = 35.45 g/mol.

∴ Formula weight of KCl = atomic weight of K + atomic weight of Cl = 39.098 g/mol + 35.45 g/mol = 74.548 g/mol ≅ 74.55 g/mol.

b. Calculate the mass of KCl in grams.

we can use the relation:

no. of moles (n) = mass/molar mass.

∴ mass of KCl = n*molar mass = (1.23 mol)*(74.55 g/mol) = 91.69 g ≅ 91.70 g.

c. Calculate the percent by mass of KCl in this solution.

The mass % of KCl = (mass of KCl/mass of the solution) * 100.

mass of KCl = 91.70 g,

mass of the solution = 1000.0 g of water + 91.70 g of KCl = 1091.70 g.

∴ The mass % of KCl = (91.70 g/1091.70 g)*100 = 8.399% ≅ 8.40%.

d. Calculate the molarity of the solution.

Molarity is the no. of moles of solute per 1.0 L of the solution.

M = (no. of moles of KCl)/(Volume of the solution (L))

no. of moles of KCl = 1.23 mol,

Volume of the solution = mass of water / density of water = (1000.0 g)/(1.00 g/mL) = 1000.0 mL = 1.0 L.

M = (1.23 mol)/(1.0 L) = 1.23 mol/L.

3 0

4 years ago

In the Atomium building, what do the tubes represent?

Monica [59]

Answer:

74 = celcus

Explanation:

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3 years ago

HELP WILL MARK BRAINLIEST!WORTH 15 POINTS!

omeli [17]

Answer: I can't see the image

Explanation: N/A

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3 years ago

Qué valores rescatas de la labor que realizan los bomberos

sertanlavr [38]

Explanation:

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3 years ago

What are ten facts about the Precambrian era?

Vsevolod [243]

1. The Precambrian is the earliest part of Earth's history, set before the current Phanerozoic Eon.

2.The Precambrian was originally defined as the era that predated the emergence of life in the Cambrian Period.

3. During the Precambrian era the earth started cooling and the outer edge of the planet solidified from molten lava to a solid crust. Water rained from the atmosphere and created oceans.

4. It is The first and longest subdivision of time for the earth.

5. The earth took form about 4.5 billion years ago. For the first 4 billion years of that time, the Earth was growing and changing.

6. he only multi-cellular life forms at the end of the Precambrian were in the oceans and included some groups that have survived until the present: jellyfishes and segmented worms.

7. The discovery of 3.85-billion-year-old marine sediments and pillow lavas in Greenland indicates the existence of liquid water and implies a surface temperature above 0 °C (32 °F) during the early part of Precambrian time.

8. The Precambrian encompasses the Archean and Proterozoic eons, which are formal geologic intervals that lasted from 4 billion to about 541 million years ago.

9. Precambrian rocks on most continents have revealed that additional primitive life-forms existed approximately 3.5 billion years ago.

10. The earliest evidence for the advent of life includes Precambrian microfossils that resemble algae, cysts of flagellates, tubes interpreted to be the remains of filamentous organisms, and stromatolites (sheetlike mats precipitated by communities of microorganisms).

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4 years ago