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2 years ago

4 possible careers in chemistry and place of application

Chemistry

1 answer:

LenaWriter [7]2 years ago

5 0

Answer:

Analytical Chemist.

Chemical Engineer.

Chemistry Teacher.

Forensic Scientist.

PLZ MARK THE BRAINLIST

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Iron has a density of 7.9 g/cm3. The volume of a regular cylinder is V =πr2h. An iron cylinder has a height of 3.00 m and a mass

Sedaia [141]

Hfhsnebrjicjcbdnd hope this helps

6 0

2 years ago

What amount of sucrose (C12H22O11) should be added to 5.83 mol water to lower the vapor pressure of water at 50 °C to 72.0 torr?

Triss [41]

Answer:

The amount of sucrose that must be added is 1.66 moles

Explanation:

Colligative property of lowering vapor pressure has this formula:

Vapor pressure of pure solvent (P°) - Vapor pressure of solution = P° . Xm

We have both vapor pressure (pure solvent and solution9, so let's determine the ΔP

ΔP = 92.6 Torr - 72 Torr = 20.6 Torr

Let's add the data in the formula

20.6 Torr = 92.6 Torr . Xm

Xm = Mole fraction of solute → (mol of solute/ mol of solute + mol of solvent)

Mol of solvent = 5.83 mol (data from the problem)

Therefore Xm = 20.6 Torr / 92.6 Torr → 0.222

Let's find out the moles of solute (our unknown value)

0.22 = moles of solute / moles of solute + 5.83 moles of solvent

0.222 (moles of solute + 5.83 moles of solvent) = moles of solute

0.222 moles of solute + 1.29 moles of solvent = moles of solute

1.29 moles of solvent = moles of solute - 0.222 moles of solute

1.29 moles = 0.778 moles of solute

1.29 / 0.778 = moles of solute → 1.66 moles

3 0

3 years ago

List three examples of high energy waves that are harmful to living things:

lord [1]

UV rays, gamma rays, and x rays
Hope this help

5 0

3 years ago

The force of attraction that holds two atoms together is called a "chemical bond". True or false? if false, what is the right an

Annette [7]

1: False; electrical force 2:true

3 0

3 years ago

Enter your answer in the provided box. phosphorus pentachloride is used in the industrial preparation of organic phosphorus comp

ankoles [38]

I have a helpful trick for such problems.

Step 1:
Write the equation asked with exact moles given in question,

PCl₃ + Cl₂ → PCl₅ --------(1)
Step 2:
Write equations given in data along with energies,

P₄ + 6Cl₂ → 4PCl₃ ΔH = −1280 kj -----(2)

P₄ + 10Cl₂ → 4PCl₅ ΔH = −1774 kj -----(3)

Step 3:
Compare the equation 1 with eq 2 and 3 and modify eq 2 and 3 according to eq 1 both in terms of reactant and product and number of moles. For example in eq 1 PCl₃ is on left hand side and its number of moles is one, so, modify eq, 2 according to eq 1 both in terms of moles and reactant product sides. i.e.
By inter converting eq 2, the sign of energy will change from negative to positive, and divide eq 2 with 4, to have its ratio's equal to eq 1

PCl₃ → 1/4 P₄ + 1.5 Cl₂ ΔH = +320 KJ

Same steps are done for eq 3, but in this case signs are not changed only moles are changed

1/4P₄ + 2.5Cl₂ → 1/4PCl₅ ΔH = −443.5 kj
Now,
Compare both last equations,

PCl₃ → 1/4 P₄ + 1.5 Cl₂ ΔH = +320 KJ

1/4P₄ + 2.5Cl₂ → 4/4PCl₅ ΔH = −443.5 kj
_____________________________________________

PCl₃ + Cl₂ → PCl₅ ΔH = -123.5 KJ

7 0

3 years ago