Answer:
-4.88 × 10⁴ kJ/mol
Explanation:
Step 1: Calculate the heat gained by the calorimeter (Qcal)
We will use the following expression.
Qcal = C × ΔT
where,
C: heat capacity of the calorimeterΔT: temperature changeQcal = 9.001 kJ/°C × 25.0°C = 225 kJ
Step 2: Calculate the heat released by the fuel
According to the law of conservation of energy, the sum of the heat released by the fuel (Qf) and the heat absorbed by the calorimeter is zero.
Qf + Qcal = 0
Qf = -Qcal = -225 kJ
Step 3: Calculate the heat of reaction in kJ/mol
3.00 g of a fuel (MW = 650.0 g/mol) released 225 kJ of heat. The heat of reaction is:
-225 kJ/3.00 g × 650.0 g/mol = -4.88 × 10⁴ kJ/mol
Any help?
The Kb for hydroxylamine, HONH2, is 1.1 x 10 -8
. What would be the pH of a solution
prepared by placing 1.34 g of HONH2 in 0.500 L of water?
Answer:
pH = 9.475
Explanation:
Hello there!
In this case, according to the basic ionization of the hydroxylamine:
[tex]HONH_2+H_2O\rightarrow HONH_3^++OH^-[/tex]
The resulting equilibrium expression would be:
[tex]Kb=\frac{[HONH_3^+][OH^-]}{[HONH_2]} =1.1x10^{-8}[/tex]
Thus, we first need to compute the initial concentration of this base by considering its molar mass (33.03 g/mol):
[tex][HONH_2]_0=\frac{1.34g/(33.03g/mol)}{0.500L} =0.0811M[/tex]
Now, we introduce [tex]x[/tex] as the reaction extent which provides the concentration of the hydroxyl ions to subsequently compute the pOH:
[tex]1.1x10^{-8}=\frac{x^2}{0.0811-x}[/tex]
However, since Kb<<<<1, it is possible to solve for [tex]x[/tex] by easily neglecting it on the bottom to obtain:
[tex]x=[OH^-]=\sqrt{1.1x10^{-8}*0.0811}= 2.99x10^{-5}[/tex]
Thus, the pOH is:
[tex]pOH=-log(2.99x10^{-5})=4.525[/tex]
And the pH:
[tex]pH=14-4.525\\\\pH=9.475[/tex]
Regards!
an artificial reef is intended to affect the ocean ecosystem by
Answer:
By strengthening the weak coral that is on the reef.
Answer: To encourage plants and animals to set up homes there to increase biodiversity.
To determine the concentration of a sodium thiosulfate solution as in this experiment, a student pipetted 25.0 mL of 0.0100 M potassium iodate (KIO3) solution into a 125 mL Erlernmeyer flask. Potassium iodide and sulfuric acid were added as in this experiment. The titration needed 15.21 mL of the sodium thiosulfate to reach the end point. What is the concentration of the sodium thiosulfate solution
Answer:
0.0986M is the concentration of the Na₂S₂O₃ solution
Explanation:
Potassium iodate, KIO₃, reacts with sodium thiosulfate, Na₂S₂O₃, as follows:
KIO₃ + 6Na₂S₂O₃ +5KI + 3H₂SO₄ → 3H₂O + 3K₂SO₄ + 3Na₂S₄O₆ + 6NaI
To solve this question we must find the moles of sodium thiosulfate that reacts as follows:
Moles KIO₃:
0.0250L * (0.0100mol / L) = 2.5x10⁻⁴moles KIO₃
Moles Na₂S₂O₃:
2.5x10⁻⁴moles KIO₃ * (6mol Na₂S₂O₃ / 1mol KIO₃) = 1.5x10⁻³ moles Na₂S₂O₃
Molar concentration:
1.5x10⁻³ moles Na₂S₂O₃ / 0.01521L =
0.0986M is the concentration of the Na₂S₂O₃ solutionname any
three kinds of mixtures with example
Answer:
Here are a few more examples:
Smoke and fog (Smog)
Dirt and water (Mud)
Sand, water and gravel (Cement)
Water and salt (Sea water)
Potassium nitrate, sulfur, and carbon (Gunpowder)
Oxygen and water (Sea foam)
Petroleum, hydrocarbons, and fuel additives (Gasoline)
Heterogeneous mixtures possess different properties and compositions in various parts i.e. the properties are not uniform throughout the mixture.
Examples of Heterogeneous mixtures – air, oil, and water, etc.
Examples of Homogeneous mixtures – alloys, salt, and water, alcohol in water, etc.
Explanation:
Answer:
smog,mud, cement?
Explanation:
Smoke and fog (Smog)
Dirt and water (Mud)
Sand, water and gravel (Cement)
During a titration, the pH of an analyte solution containing HA(aq) is 3.92 and the ratio of [A–]/[HA] is 0.41. What is the Ka of HA?
Answer:
[tex]Ka=4.71x10^{-4}[/tex]
Explanation:
Hello there!
In this case, according to the Henderson-Hasselbach equation, it is possible to write:
[tex]pH=pKa+log(\frac{[A^-]}{[HA]} )[/tex]
Next, since we are given the pH and the [A–]/[HA] ratio, we can solve for the pKa as shown below:
[tex]pKa=pH-log(\frac{[A^-]}{[HA]} )[/tex]
Now, we plug in the values to obtain:
[tex]pKa=3.92-log(0.41 )\\\\pKa=3.33[/tex]
Next, Ka is:
[tex]Ka=10^{-pKa}=10^{-3.33}\\\\Ka=4.71x10^{-4}[/tex]
Best regards!
(giving brainiest)
brainly will ban you if you answer with a wrong absurd answer or copied answer if the question has over 50 points in it!
Answer:
Mars and jupiter
Explanation:
Similarities
-both circle the sun
-both have atmospheres
- both have moons
Differences
-mars is red and rocky
-jupiter is the largest planet
-mars is most like our earth
- jupiter has rings
do liquids have a higher molecular attraction
Info gathered by site below:
Liquids
denser than gases
have a definite volume
attractive forces not strong enough to keep molecules from moving allowing liquids to hold shape of container
Thanks to:
Source: https://chem.libretexts.org/Bookshelves/General_Chemistry/Map%3A_Chemistry_-_The_Central_Science_(Brown_et_al.)/11%3A_Liquids_and_Intermolecular_Forces/11.S%3A_Liquids_and_Intermolecular_Forces_(Summary)
So dont thank me. thank the website.
Guess this song
Okay I was gone for a minute but I'm back down. Sit the F back down
Seem like everybody nowadays Hollywood
Oh it's like that now?
I'ma show you mf how to act now
I'ma show 'em how to act
This is gonna get reported I all ready now XD
Answer:
it is logic: everybody
Explanation:
that's the song
What is the key difference between a liquid and a gas?
Answer:
What is the key difference between gases and liquids? EZZZZZ. The particles in a liquid are attracted to one another; the particles in a gas *are not attracted *.
Explanation:
water
air
multiple cells
a place to live
Answer:
I guess it WATER
An __________ includes all living and non-living things in an environment.
Answer:
an ecosystem
Explanation:
it compromises of living and non living things in an environment.
Match each energy type with the source it uses.
Solar
?
Nuclear reactions
Hydropower
?
Moving water
Geothermal
?
Sun's rays
Biomass
?
Plants
ASAP HELL
The energy exists in many different forms. Each form of energy can be converted or changed into the other forms. The geothermal energy denotes the thermal energy.
What is solar energy?The energy produced from the sun is called the solar energy. The heat and light which come from the sun is the solar energy. The solar energy play an important role in reducing the emissions of green house gases and also control the climate change.
The biomass is known as the fuel obtained from the organic matter waste of the living organisms such as plant waste, animal waste and municipal wastes. It is the fuel developed from plants.
The hydropower is the largest source of renewable energy which uses the moving water to produce electricity. The energy which is generated from the heat within the earth is called the Geothermal energy.
Thus,
Solar - sun's rays
Moving water - Hydropower
Plants - Biomass
Nuclear reactions - Geothermal
To know more about solar energy, visit;
https://brainly.com/question/29343234
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help pls i give twenty points and brainlist
Answer:
C and B are the correct answers
aluminium extraction from its ore
(giving brainiest)
tell how you solved the question
QWERTYUIOPASDFGHJKLZXCVBNM
Which of the following is an example of a situation where work occurs?
A
a glass of water sitting on the counter
B
a leaf resting on a rock
с
a student sitting at a desk
D
a baseball soaring through the air
Answer:
a baseball soaring through the air
Explanation:
According to the passage, “Work occurs whenever something is moved and an object is put into motion.” A baseball soaring through the air is an object in motion.
An example of a situation where work occurs is a baseball soaring through the air. Therefore, option D is correct.
What is work ?Work is defined as the energy that is applied to or removed from an object by applying force along a displacement. In its simplest form, it equals the product of the force's magnitude and the distance traveled for a constant force directed in the same direction as the motion.
Inertia law. Its name derives from an object's propensity to resist any change in motion up until an out-of-balance force acts on it.
A force that opposes motion is friction. Friction occurs when two moving objects come into touch and operates in the opposite direction.
The angle between force and displacement determines the kind of work that is done. Positive work occurs when a force is applied and an object is moved in that direction.
Thus, option D is correct.
To learn more about work, follow the link;
https://brainly.com/question/19382352
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Identify the labeled structures.
How many moles are present when there are 1.00.1026 molecules of water?
Answer: 1.00×10^26=1000×10^23
1000×10^23/6.022×10^23=166.05×10^23 moles of water.
HOPE IT HELPS ☺️
PLEASE MARK AS BRAINLIEST
Explanation:
Compare and contrast the way energy can transfer from one object to another.
Answer:
Energy is transferred from the hotter object to the cooler one, and the difference in temperature between them decreases.Explanation
igneous sedimentary, and metamorphic rocks are found at the same cliff side.Which statement is correct?
Answer:
The metamorphic rock and sedimentary rock were already at this location and magma flowed into other rocks
Explanation:
When a nonmetal gains electrons, it becomes this type of ion.
Answer:
When these atoms gain electrons, they acquire a negative charge because they now possess more electrons than protons. Negatively charged ions are called anions. Most nonmetals become anions when they make ionic compounds. A neutral chlorine atom has seven electrons in its outermost shell.
Explanation:
Hope this helps!
help me with this question?!!
Answer:
Glow sticks and match would be light emission, slime would be preciptate, and cookies would be gas.
Explanation:
What is the ionic charge for the lead ion in PbS2?
Answer:
[tex]\boxed {\boxed {\sf +4}}[/tex]
Explanation:
Lead (Pb) has 2 positive oxidation states, +4 and +2.
Sulfur (S) has 3 oxidation states: +6, +4, and -2. Since lead creates a positive ion, sulfur must be a negative ion to balance the charges.
There are 2 atoms of sulfur, each with a charge of -2. Therefore, their overall charge is -4, because 2* -2= -4.
A compound has a net charge of 0. To achieve this, lead must have a charge of +4 to balance out the -4 charge of sulfur.
Lead has a +4 ionic charge in PbS₂
7.) Regarding molecular formula and empirical formula for a particular compound... (A) the subscripts in the empirical formula must be greater than or equal to those of the molecular to (B) the subscripts in the empirical formula must be less than or equal to those of the molecular form (C) the subscripts in the empirical formula must always be equal to those of the molecular formula (D) the subscripts in the empirical formula must be less than or greater than those of the molecular.
Answer:
Explanation:
i think the anwer would be that its elliptical orbit and the tilt an its axis.
The distances from large bodies of water will affect the average rainfall of an area. (Example: Florida has more rain than Nevada) *10 points
A. True
B. False
Answer:
A
Explanation:
help Tell me the answer.
Answer:
it's easy u just have to put them in a calculator the way they are it will give you your answer atleast I think so hope this helps
A compound has the empirical formula CH20 and a
gram-formula mass of 60. grams per mole. What is the
molecular formula of this compound?
Answer:
The molecular formula of this compound is (2) C2H4O2.
Explanation:
A student claims that she cannot identify the exact location of an electron. Which of the following explains if the student's claim is correct or
incorrect? (1 point)
The claim is incorrect because a particle can have a known location at a given time.
The claim is correct because an electron is invisible and cannot be seen.
The claim is correct because we cannot determine the exact location of an electron at a given time.
The claim is incorrect because the exact position of matter is always visible or can be determined.
Answer:
The claim is incorrect because the exact position of matter is always visible or can be determined.
150. g of aluminum chloride in 0.450 liters of solution, what is the concentration? (any examples are helpful, thank you)
Answer:
2.49 M
Explanation:
Step 1: Given data
Mass of AlCl₃: 150. gVolume of solution: 0.450 LStep 2: Calculate the moles AlCl₃ (solute)
The molar mass of AlCl₃ is 133.34 g/mol.
150. g × 1 mol/133.34 g = 1.12 mol
Step 3: Calculate the molar concentration of AlCl₃
Molarity is equal to the moles of solute divided by the liters of solution.
M = 1.12 mol/0.450 L = 2.49 M
What layer of the Sun is the location for nuclear fusion?