Help!!!
An unknown salt was dissolved to make a total 1.53g of solution. The temperature of the water decreased from
24.3C to 20.3C when 8mol were dissolved. What is the heat of solution in J/mol?

Answer:

P2 = 0.91 atm

Explanation:

Using Gay-Lussac's Law for this question: P1/T1 = P2/T2

P1 = 101 kPa (dividing by 101.3 to convert to atm) = 0.99 atm

T1 = 23C (must be convert to Kelvin by plus 273.15) = 296.15K

T2 = 0C = 273.15K

P2 = ?

P1/T1 = P2/T2

(Multiply both sides by T2 to get rid of it).

273.15 x 0.99/296.15 = P2

P2 = 0.91 atm

A weather map of Chicago with a high pressure system and warm front, so the upcoming weather be Warm, dry, clear skies in Chicago.

High pressure of air tries to compress the gas from upper atmosphere to lower atmosphere.

When any gas has high pressure then it sinks towards the land from the upper atmosphere, and at the upper part air gets cool and form water vapor. When air comes towards the land then, it becomes warm and dry as it doesn't participate in the formation of precipitate. Due to which we are able to see clear sky at the dry days.

Hence, option (1) is correct i.e. Warm, dry, clear skies are the upcoming weather.

To know more about pressure of air, visit the below link:

https://brainly.com/question/441281

Answer:

A. Warm, dry, clear skies

( Hope this helps ) <3    ( Give person above brainliest )

The discrepancy in how much a person can lift on Earth and in Mars is due to the difference in the acceleration due to gravity in both planets.

Although, the physical Quantity, mass is always constant as it is a measure of the quantity of matter in a body. The weight on the other hand is a function of the acceleration due to gravity and hence is different in different planets.

On this note, it follows that a person can carry 270kg mass on earth and 440kg mass on Mars.

Read more on weight and gravity;

https://brainly.com/question/2537310

Answer:

the first picture is of prophase and the second one is interphase

Explanation:

please Mark as BRAINLIEST

Answer:

C

Explanation:

i took the test

The temperate climatic zone has hot summers, cold winters, and average amounts of precipitation throughout the year. Thus, option C is correct.

The climatic zone may be defined as a world area or part discerned from a neighbor by a significant physical climatic attribute that is of a transnational scale.

The movement of the sun from the tropic of cancer to the tropic of Capricorn determines the climate of a particular zone. The equator zone is more consistent with climatic attributes. The tropical zone has seasonal climatic attributes.  

Therefore, the correct option is C.

To learn more about the Climatic zone, refer to the link;

https://brainly.com/question/1112371

#SPJ2

You can determine which is which by weighting them

Copper usually weighs heavier than iron, so if you weigh them both on the scale, the heavier one would be the copper cube

Hope this helped!

Answer:

d metallic is the sum of the following is not a primary function of the following method

#17

#a

Group 15 elements have valency 3

#b

Let's check the EC of both

[tex]\\ \rm\Rrightarrow [O]=1s^22s^22p^4[/tex]

[tex]\\ \rm\Rrightarrow [S]=[Ne]3s^23p^4[/tex]

#c

Decrease in size

#18

#a

#b

#c

1. The empirical formula of the compound is HNO₃. The name of the compound is trioxonitrate (v)

2. The empirical formula of the compound is PbN₂O₄ or  Pb(NO₂)₂

3. The molecular formula of the compound is N₂O₅

Divide by their molar mass

H = 1.6 / 1 = 1.6

N = 22.2 / 14 = 1.586

O = 76.2 / 16 = 4.7625

Divide by the smallest

H = 1.6 / 1.586 = 1

N = 1.586 / 1.586 = 1

O = 4.7625 / 1.586 = 3

Thus, the empirical formula of the compound is HNO₃ and the name of the compound is trioxonitrate (v)

Divide by their molar mass

Pb =13 / 207 = 0.0628

N = 1.77 / 14 = 0.1264

O = 4.03 / 16 = 0.2519

Divide by the smallest

Pb = 0.0628 / 0.0628 = 1

N = 0.1264 / 0.0628 = 2

O = 0.2519 / 0.0628 = 4

Thus, the empirical formula of the compound is PbN₂O₄ or Pb(NO₂)₂

We'll begin by determining the empirical formula of the compound. This can be obtained as follow:

Divide by their molar mass

N = 4.04 / 14 = 0.2886

O = 11.46 / 16 = 0.71625

Divide by the smallest

N = 0.2886 / 0.2886 = 1

O = 0.71625 / 0.2886 = 2.5

Multiply by 2 to express in whole number

N = 1 × 2 = 2

O = 2.5 × 2 = 5

Thus, the empirical formula of the compound is N₂O₅

Finally, we shall determine the molecular formula of the compound. This can be obtained as follow:

Molecular formula = empirical × n = molar mass

[N₂O₅]n = 108

[(2×14) + (16×5]n = 108

[28 + 80]n = 108

108n = 108

Divide both side by 108

n = 108 / 108

n = 1

Molecular formula = [N₂O₅]n

Molecular formula = [N₂O₅] × 1

Molecular formula = N₂O₅

Learn more about empirical and molecular formula:

https://brainly.com/question/26273076

Similar to Arctic foxes, the Grey wolves fur turn white in winter as a form of adaptation to enable to avoid detection by prey.

Adaptation refers to the special features or structures possessed by organisms which enhances their chances of survival in their environment.

Arctic foxes turn white in winter in order to avoid detection by predators as well as to be able to easily catch prey.

A similar adaptation has been observed in grey wolves whose fur turn white in winter to enable to avoid detection by prey.

Learn more about adaptation at: https://brainly.com/question/29594

Answer:willow ptarmigan

Explanation:They change their feathers to white in the winter from red in the summer

Answer:

Alcohol evaporates much faster than water due to its lower boiling temperature. This allows more heat to be transferred faster, which makes it feel colder to the touch.

Explanation:

answer

Explanation: i think 0.49

Answer:

letter D is the answer

Explanation:

D. The final temperature is 350 K, while pressure remains constant

Answer:350 K, while pressure remains constant

Explanation:

Answer:

Big dipper

Explanation:

Explanation:

the difference between a nuclear bomb and a thermonuclear bomb is that :

A nuclear bomb derives it's destructive force from nuclear reaction. That is,fission reaction, fusion reaction or both.

While thermonuclear bomb derives it's own force from a chain reaction in which isotopes of hydrogen combines under extremely high temperature to form helium under a process known as nuclear fusion.

PLEASE RATE AND MARK BRIANLIEST!!!

Answer:

To me a two column proof is usually associated with Euclidean Geometry.

To use it here in this rather simplistic problem is like using a sledge hammer to drive in a finishing nail ...

here is what I would do

7y=8x-14; y=6

then:

42 = 8x - 14

56 = 8x

x = 56/8 = 7

There! I have proven it.

Explanation:

Answer:

under me :)

Explanation:

There is water vapour present around us. When you put cold glass on a table, the water vapour comes in contact with the glass, and condenses, forming water droplets which are seen around the glass. Hope this helps

Answer:

3n+2n=5n 5 nitrogen atoms

3.07 moles of hexane must burn to form 18.4 moles of carbon dioxide.

Moles of any substance is define as the ratio of the given mass to the molar mass of that substance.

Given chemical reaction is:

2C₆H₁₄ + 19O₂ → 12CO₂ + 14H₂O

From the stoichiometry of the reaction, it is clear that:

2 moles of C₆H₁₄ = produce 12 moles of CO₂

1 moles of CO₂ produced by = 2/12 moles of C₆H₁₄

18.4 moles of CO₂ produced by = 1/6×18.4=3.07 moles of C₆H₁₄

Hence, option (2) is correct i.e. 3.07 moles.

To know more about moles, visit the below link:
https://brainly.com/question/1464305

The specific proteins produced by cell B in response to the foreign substance are antibodies.

Antibodies are specific proteins produced by the immune cells of the body in response to a foreign substance called antigen which produces the immune response.

Antibodies are released by immune cells such as B cells.

The antibodies bind to antigen and tag them for destruction by phagocytes.

Therefore, cell B will produce antibodies.

Learn more about antibodies at: https://brainly.com/question/15382995

Answer:

alkali metals, alkaline earth metals, transition metals, basic metals, lanthanides (rare earth elements), and actinides. 

Explanation:

Answer:

Explanation:

1: the sciencetific name of a giant squid is called Architeuthis

2: i dont know I think it says diet but: Giant squid mostly eat deep water fishes and other squids.
3: the range of a Giant squid can be found in oceans around the world at depths of at least 2,950 feet, but their exact  range is unknown.

4, characteristics,

1: it has two large fins attached to its mantle.

2: the giant squid have many unique features, such as their ability to produce 'ink' to distract and deter predators.  

3:

facts,

1: Their eyes are the largest eyes in the animal kingdom and are about 10 inches

2: Their big eyes help them to spy objects in dark depths where most other animals would see nothing

3: Until 2005, nobody had ever seen a giant squid that was alive.

4: According to the stories, an huge squid would wrap its arms around a whale, causing a terrible fight to start. 
5: Giant squid have small fins at the rear of their mantles used for locomotion. 

Human IMPACT

Not only can squids and octopuses sense sound, but as it turns out, these and other so-called cephalopods might be harmed by growing noise pollution in our oceans—from sources such as offshore drilling, ship motors, sonar use and pile driving.

Answer:0.633 0.440

Explanation:

edge

There are  0.6326 mole in Cu atom and 0.4397 mole in S atom.

A mole would be defined as the quantity of a material that includes precisely 6.02214076 X [tex]10^{23}[/tex] of the substance's elementary entities.

Calculation of mole of Cu

Given data:

Mass of Cu = 40.2 g

Molar mass of Cu = 63.546 u

Mole?

Mole can be determined by the formula:

Mole = mass / molar mass

Mole = 40.2 g / 63.546 u

Mole = 0.6326

Calculation of mole of S.

Given data:

Mass of S = 14.1 g

Molar mass of S = 32.065u

Mole = ?

Mole can be determined by the formula:

Mole = mass / molar mass

Mole = 14.1 g / 32.065u

Mole = 0.4397

Therefore, there are  0.6326 mole in Cu atom and 0.4397 mole in S atom.

To know more about mole.

https://brainly.com/question/26416088

#SPJ2

Answer:

A. forms, I used his answer and it was wrong so forms is the answer...

Answer:

30mL is required

30ml of a 2.50 M hydrochloric acid solution is required to make 100.0 mL of a 0.750 M solution.

HCl is an acid which is made up of hydrogen and chlorine gas.

By the formula of dilution

M1V1 = M2V2

where V1 = 2.50 m

M2 = 100.0

V2 = 0.750 m

M1 × 2.50 m = 100.0 × 0.750 m

M1 = 30 ml

Thus, the M1 is 30 ml option a is correct.

Learn more about HCl

https://brainly.com/question/3637432

Electrolysis is a process, which allows us to break down a chemical compound into its elements, completing the balance by adjusting the number of atoms on both sides of the reaction is important because the number of electrons given up during oxidation must be the same as the number of electrons gained during the reduction.

It is a process of oxidation and reduction of one or more elements that, through the induction of electric current, breaks down the water molecule (H2O), thus producing gaseous hydrogen and oxygen.

Oxidation and reduction processes occur simultaneously and never in isolation, which is why they are called redox reactions.

Therefore, we can conclude that electrolysis is a process where electrical energy will change to chemical energy where it is important that the number of electrons given up during oxidation is the same as the number of electrons gained during reduction.

Learn more about balance of redox equations : https://brainly.com/question/1232351

Answer:

The reaction is: -67.68

Explanation:

hope this helped:)

Answer:

V2 = 3.39

Explanation:

V1/T1 = V2/T2

V1 = 6.80L

T1 = 325C (must be convert to K by + 273.15) = 598.15 K

T2 = 25C = 298.15 K

V2 =?

T2xV1/T1 = V2

298.15 x 6.80/ 598.15 = V2

3.39 = V2

So 3.39 is the answer!