The change in entropy when 15.0 g of acetone vaporizes at its normal boiling point is 22.8 J/K, expressed with three significant figures.
To calculate the change in entropy (ΔS) when acetone vaporizes, you need to use the formula ΔS = q/T, where q is the heat absorbed during the phase change and T is the temperature in Kelvin.
First, convert the boiling point of acetone from Celsius to Kelvin: T = 56.1 + 273.15 = 329.25 K.
Next, find the enthalpy of vaporization (ΔHvap) for acetone, which is 29.1 kJ/mol.
Now, you need to determine the number of moles (n) of acetone in 15.0 g.
The molar mass of acetone is 58.08 g/mol, so n = 15.0 / 58.08 ≈ 0.258 mol.
Calculate the heat absorbed during vaporization:
q = n * ΔHvap = 0.258 mol * 29.1 kJ/mol = 7.50 kJ. Remember to convert this to J: q = 7500 J.
Finally, calculate the change in entropy:
ΔS = q/T = 7500 J / 329.25 K = 22.8 J/K.
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How does the temperature of the air change with altitude?
how do humans impact the distribution of minerals?
Answer:
With our modern tools and increased rate of mining industries being built, id say we deal a big impact on mineral exportation.
Explanation:
You're leaving a carnival and you're pumped because a clown just handed you a red, helium- filled balloon. But then, something tragic occurs. You hear the ice cream truck, jump with joy doing a 180 degrees in the air, and you lose grip of your beautiful balloon. Upward it flies as you stare speechless into the sky. Why did this helium balloon fly away instead of falling to the ground like a balloon filled with your breath usually does?
. ILL GIVE BRAINLY
Why does the top layer of the rainforest receive the most sunlight?
Its tall trees rise above all the other layers.
The plants there have very broad, dark green leaves.
It has many trees and vines.
The trees there are thicker than in the other layers.
Answer:
It has many trees and vines
Explanation:
Answer:it’s tall trees rise above all the other layers
Explanation:
The quiz said so
PLS HELP ME THIS IS DUE TODAY BRO ILL BRAINLIST U JUST DO THE ONES U KNOW WAJDHWNDIGB!
Answer: Helium: atomic number 2. EC 2
Neon: atomic number 10. EC 2,8
hydrogen: atomic number 1. EC 1
magnesium: atomic number 12. EC 2,8,2
chlorine: atomic number 17. EC 2,8,7
Aluminum: atomic number 13. EC 2,8,3
Explanation: hope this helped
A chemist determined by measurements that 0.050 moles of tin participated in a chemical reaction. Calculate the mass of tin that participated in the chemical reaction.
Be sure your answer has the correct number of significant digits.
Answer:
Explanation:
MM of I2 = 2 (127 g) = 254 g/mol
0.065 mol I2 x 254g I₂/ 1 mol I₂ = 16.5 g I2
he distance from Earth to the North Star is about 430 light-years. Which of the following statements describes why scientists use the light-year unit to measure distances in space?
A light-year unit is very small and distances in space are very small.
A light-year unit is very small and distances in space are very large.
A light-year unit is very large and distances in space are very small.
A light-year unit is very large and distances in space are very large.
Answer:
D
Explanation:
because the rest don’t make any sense
A light-year unit is very large and distances in space are very large. Therefore, the correct option is option D.
What is distance?No matter the direction of the journey, distance is the overall path that an item in motion has traveled. Since just the length of the path travelled is calculated as well as the motion's direction is ignored, distance is referred to as a scalar number. The distance can only ever be positive; it can never be 0 or negative.
Displacement generally defined as the overall alteration of an object's location and motion direction. Displacement is recognized as a vector quantity since it takes into consideration both the directions of the motion and the amount of the changing position. Displacement may be zero, positive, or negative. A light-year unit is very large and distances in space are very large.
Therefore, the correct option is option D.
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When talking about the products of photosynthesis, why is it a HUGE issue when a vast amount of the rainforests is dying along with vast acres of forests from fires/deforestation? Remember, we know that this hurts the ecosystems of animals living there, but what else does it effect? Question 5 options: the creation of too much water the creation of oxygen the creation of to much heat the creation of carbon monoxide
Answer:d
Explanation:because im really really sure thats the answer
DUE IN 10 MINUTES I WILL MAKE YOU BRAINILIST
Answer:
Ernest Rutherford postulated the nuclear structure of the atom, discovered alpha and beta rays, and proposed the laws of radioactive decay. He received the Nobel Prize in Chemistry in 1908.
Erwin Schrödinger proposed the quantum mechanical model of the atom, which treats electrons as matter waves. ... The Heisenberg uncertainty principle states that we can't know both the energy and position of an electron.
hope it helps
Which of the following statements is true? According to the Law of Inertia, the Earth will stay in motion because it is already moving. The sun's gravitational pull keeps the Earth from moving in a straight line. The speed of the Earth's motion keeps it from crashing into the sun. All of the above.
Answer:
The Earth will stay in motion because it is already moving.
Answer:
b
Explanation:
How many moles are in sample containing 2.71 x 10^24 atoms of iron?
Answer:
4.5 moles
Explanation:
One mole is equal to 6.022 x 10^23 atoms
2.71 x 10^24 atoms * 1 mol/ 6.022 x 10^23 atoms = 4.5 moles
Magnesium is the limiting reactant in this experiment: Calculate the theoretical yield of MgO for each trial. Determine the percent yield of MgO for each trial. Determine the average percent yield of MgO for both trials.
Answer:
how do u want me to do this
Explanation:
Hey I'm Chloe,
Does anyone know How many sides and Octagon has?
I Tried Researching it but Nothing came up.
Our current model of a chemical bond is to think of it as an electrical interaction between what two parts of an atom
Answer:
Explanation:
It involves the thinking of it as an electrical interaction between the positively charged part of an atom and the negatively charged part as well. Succinctly put, the interaction between the proton of an atom and the electron of an atom.
The relationship between these two sub atomic particles is one of the basis for many chemical bonding, and this is inclusive of all the bonds there exist. Hydrogen, Electrovalent and even Covalent bondings to mention but a few
If sodium (Na) bonds with chlorine (Cl), which statement is true?
An electron is transferred from sodium to chlorine and an ionic bond is
formed.
An electron is shared between sodium and chlorine and an ionic bond is
formed.
An electron is transferred from sodium to chlorine and a covalent bond is
formed.
An electron is shared between sodium and chlorine and a covalent bond is
formed.
Answer:
First Statement is correct
Explanation:
An electron is transferred from sodium to chlorine and ionic bond is formed.
Hope it help!!
If sodium ( Na ) bonds with chlorine ( Cl ), then an electron is transferred from sodium to chlorine and an ionic bond is formed. Therefore, option A is correct.
What is ionic bond ?The main interaction taking place in ionic compounds is ionic bonding, a form of chemical bonding that includes the electrostatic attraction between two atoms or ions with dramatically differing electronegativities.
When the ionic character is larger than the covalent character, i.e., when there is a significant difference in the electronegativity between the two atoms, the bond is more polar than when the electrons are divided more evenly in covalent bonding.
The ionic bond found in the salt sodium chloride is an illustration of this type of connection. The valence electron from sodium is transported to chloride's outer electron shell.
Thus, option A is correct.
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describe nucleus of atom
Answer:
the nucleus is made up of protons and neutrons
hey guys i dont want to beg for help but i just am stuck in this q please help
I try this before but for me is letter C
Answer:
C
Explanation:
i took the test
BALANCE THE FOLLOWING EQUATION
1.) Sc(C2H3O2)3 + Na3BO3 = NaC2H3O2 + ScBO3
2.) Ba3(PO4)2 + Ca2SiO4 = Ba2SiO4 + Ca3(PO4)2
Answer:
1) Sc(C2H3O2)3 + Na3BO3 = 3 NaC2H3O2 + ScBO3
2) 2 Ba3(PO4)2 + 3 Ca2SiO4 = 3 Ba2SiO4 + 2 Ca3(PO4)2
Now molecules: Choose... molecules of H 2 + Choose... molecules of O 2 → Choose... molecules of H 2 O
Answer:
2 H2 + 1 O2 → 2 H2O
Explanation:
Fill in the blanks. In this phase, the particles are still in contact, but now move freely past each other. Heating a liquid sample will result in the particles having---- kinetic energy and the temperature of the liquid will ------- until it reaches the point at which there is another phase change, this time to a ------- .
Which of the following examples is a chemical property?
Answer:
Examples of chemical properties include flammability, toxicity, acidity, reactivity (many types), and heat of combustion. Iron, for example, combines with oxygen in the presence of water to form rust; chromium does not oxidize (Figure 2).
Explanation:
What is the Lewis dot diagram for GaF3
Can someone help me
Answer:
View attached image
The purpose of mitosis is to produce
A. Sex cells
B. Body cells
C. DNA
empirical formula of c8h14
Answer:
C4H7
Explanation:
Empirical formula is defined as the simplest ratios of atoms present in the compound.
The empirical formula for C8H14 is C4H7 as if you multiply each coefficient of C4H7 by 2, it will become C8H14. The chemical name of C8H14 or C4H7 is 1-Methylcycloheptene.
Hence, the correct answer is "C4H7".
Amoeba have the following metabolism.
A. Autotrophic
[tex] \huge \purple{\tt{Answer:}} [/tex]
a. Autotrophic
Why Doesn't The Earth Usually Feel Solar Winds?
Answer:
When the solar winds approach the Earth, the magnetosphere (part of the Earth's natural magnetic defenses) deflects/repels most of the charged particles and shields our planet's surface from the winds. Sometimes, however, the magnetosphere isn't strong enough to block the Earth from these winds, so they do hit Earth and may cause catastrophic consequences, such as ruin power grids, cut off telecommunications (cell service/calls), etc.
Hope this helps you out! Have a nice day! :)
ANSWER ASAP GIVING BRAINLIEST FIVE STARS AND A HEART!!!
Write a paragraph that explains the differences among incandescent, fluorescent, and laser light.
Answer:
An incandescent light bulb works by heating a filament in the bulb. Fluorescent light is a bright light produced by electricity flowing through a tube filled with ionized gas. Fluorescent light bulbs are more energy-efficient than incandescent bulbs.
Explanation:
Is barium hydroxide Ba(OH)2 or is BaOH?
Answer:
What is the charge on the barium ion and what is the charge of the hydroxide ion.
Explanation:
To get the correct formula they have to add to zero over all.
9. This type of bond consists of closely packed cations and loosely held valence e- rather than
neutral atoms.
a. lonic
b. Covalent
c. Metallic
d. polyatomic
1) What type of molecule is water and why? Show its lewis structure, shape, and
explain what type of compound it is in terms of bond type and symmetry.
2) Which part of the water molecules will attract to the negatively shared balloon
and why? Show how the water molecule aligns itself to the negative part of the
balloon.
(PLeASE HeLP)
Answer:
I DO NOT UNDERSTAND THE QUESTION, BUT THANKS FOR THE COINS/TOKENS!
Explanation: