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3 years ago

What is the main purpose of the second paragraph?

Chemistry

1 answer:

Svetlanka [38]3 years ago

5 0

To explain your first paragraph which includes your thesis. The second paragrph supports your first pragraph

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The normal boiling point of a substance occurs when its vapor pressure is 1.00 atm, which means that at this temperature, the li

Sladkaya [172]

Answer:

See explanation below

Explanation:

For start, we need some values here to do this exercise.

In general, you can calculate the normal boiling point of any substance by using the Clausius Clapeyron equation which is the following:

ln(P2/P1) = -ΔHvap/R (1/T2 - 1/T1)

Where:

P1 and P2: pressure of the substance at T1 and T2.

ΔHvap: enthalpy of vaporization of the substance. In the case of bromine is 29.6 kJ/mol

R: constant gas. In this case is 8.3145 J/mol K

T1 and T2: temperature of the substance.

In order to calculate the normal boiling point, we will assign that value to T2, and the pressure would be 1 atm or 1.01x10^5 Pa

T1 and P1 would be temperature and pressure of this substance at any condition. For this example, I will take the fact that Bromine has 22000 Pa at 20 °C (or 293.15 K)

With this data, let's replace in the clausius Clapeyron equation:

ln(1.01x10^5 / 22000) = -29600/8.3145 (1/T2 - 1/293.15)

-1.5241 * 8.3145 / 29600 = (1/T2 - 1/293.15)

-4.281x10^-4 + 1/293.15 = 1/T2

T2 = 1 / 2.9831x10^-3

T2 = 335.22 or 62.07 °C

The real one is 59 °C so, the difference in the result may come with the values of P1 and T1 that may be not accurate.

7 0

3 years ago

As a scuba diver descends under water, the pressure increases. at a total air pressure of 2.85 atm and a temperature of 25.0 ∘c,

Radda [10]

Henry's Law is written in equation as:

C = kP
where
C is the concentration
k is the Henry's law constant
P is the partial pressure

This law is applied to soluble gases in liquids. At a certain temperature, there is a specific value of the Henry's Law constant. The C represents the solubility. Hence, we solve for C.

C = (6.26×10⁻⁴ mol/(L⋅atm))*(2.85 atm)
C = 0.0017841 mol/L

4 0

4 years ago

The total number of valence electrons in the phosphate ion is

Vitek1552 [10]

Answer:

Step-by-step explanation:

There are two ways you can count the valence electrons.

A. From the Periodic Table

1 × P (Group 15) = 5

4 × O (Group 16) = 4 × 6 = 24

+3 e⁻ (for the charges) = 3

Total = 32

B. From the Lewis structure

In the Lewis structure (below), each line (bond) represents a pair of bonding electrons, and each dot represents an unbound electron (half a lone pair).

5 lines (bonds) = 5 × 2 = 10

3 single-bonded O atoms = 3 × 6 = 18

1 double-bonded O atom = 4

Total = 32

4 0

4 years ago

Who was Alexander Fleming

azamat

Sir Alexander Fleming (6 August 1881 – 11 March 1955) was a Scottish physician and microbiologist, best known for discovering the enzyme lysozyme and the world's first broadly effective antibiotic substance which he named penicillin.

For this discovery he shared the Nobel Prize in Physiology or Medicine in 1945 with Howard Florey and Ernst Boris Chain.

3 0

3 years ago

Read 2 more answers

Which two species are most closely related

Eddi Din [679]

Can you post a picture?

3 0

3 years ago