Answer:
Explanation:
2C₄H₁₀ + 13O₂ = 8 CO₂ + 10H₂O
Change in number of moles Δn = 18 - 15 = + 3 moles .
ΔHo = -2658.3 kJ/mol.
ΔHo = ΔEo+ Δn RT
Δn = 3
For one mole Δn = 1.5
ΔHo = ΔEo+ W
W = Δn RT
= 1.5 x 8.31 x 298
= 3714.5 J
= 3.7 kJ /mole
ΔHo = ΔEo+ W
ΔEo = ΔHo - W
= -2658.3 - 3.7 kJ
= - 2662 kJ .
(a) The work done for the combustion of 1 mole of methane is 3,714.5 J.
(b) The change in the energy of the given system is -3,991.2 kJ.
The balanced chemical reaction of the given compounds is written as follows;
[tex]2C_4H_{10} \ + \ 13O_2 \ -->\ 8CO_2 \ + \ 10H_2 O[/tex]
The change in number of moles;
[tex]\Delta n = 18 - 15 = 3[/tex]
The work done for the combustion of 1 mole of methane is calculated as follows;
[tex]W = \frac{\Delta n}{2} RT\\\\W = \frac{3}{2} \times 8.31 \times 298\\\\W = 3,714.6 \ J[/tex]
The energy change is calculated as follows;
[tex]\Delta E_0 = \Delta H_o - W\\\\\Delta E_0 = (\frac{3 \ mole}{2} \times-2658.3 \ kJ/mol) - 3.715 \ kJ\\\\\Delta E_0 = -3,991.2 \ kJ[/tex]
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20 POINTS!!!
3. Which substance will take more energy to heat from 20C to 100C?
a) 30 g of water
b) 300 g of water
and WHY?
Answer:
300g of water because its a larger amount
Explanation:
During the production of yogurt, specific ___________ are used to ferment the milk. In turn, the same ___________ are beneficial to our digestive system when we eat the yogurt.
Question 10 options:
A)algae
B)bacteria
C)fungi
D)protozoan
I will give you brainlest
QUESTION:
What was the Proclamation of 1763? *
ANSWER CHOICES:
A. A law passed by the British parliament that allowed colonial movements west of the Appalachian Mountains.
B. A law passed by the French parliament that prohibited colonial movements west of the Appalachian Mountains.
C. A law passed by the British parliament that prohibited colonial movements west of the Appalachian Mountains.
D. A law passed by the President that prohibited colonial movements west of the Appalachian Mountains.
Answer:
C. A law passed by the British parliament that prohibited colonial movements west of the Appalachian Mountains.
Explanation:
Answer:
✔ Cumberland Gap
was a natural mountain pass through the Appalachian Mountains.
This is the Correct Answer!
This might not be the same Question. This is history 5th Unit.
Two students stand close to each other Why do they not get pulled closer to each other due to the gravitational pull they exert on each other
Answer:
there gravitational force is very less to pull the weight of a person.
Two students who stand close to each other don't get pulled closer as a
result of gravitational force because the magnitude of the force is small.
Gravitational force acts on all objects on Earth but the force exerted is very
small as a result of the masses of the students being very small as to when
compared with that of the earth.
The large difference in mass of the student and earth is the reason why the
effect of the force is very little and unable to move them closer.
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facing the wind. A) windward B) subaric C) monsoon D) biotic
Reflections
What have I learned in this activity
1. I have learned that
Answer:
I havent the foggiest.
Explanation:
Answer:
Explanation:
I havent the foggies
How can being Energy Independent be a bad thing?
Mrs. Elder travelled from Zillah, WA to Tacoma, WA in 3 hours. She traveled 201 miles on the trip. What was the speed she traveled at with no stops? (Speed=Distance/Time)
Answer:
201 ÷ 3 = 67mph
Explanation:
let me know if you want me to explain more
You have 85.63 g of CO2, how many molecules of CO2 are in that
container?
Ans:
______X 1024 molecules of CO2
Explanation:
1.17×10^24 molecules of co2
Which represents the smallest percentage of earths water a.frozen water b. Ground water c. Salt water d.surface fresh water
ANSWER: Surface Fresh Water
Humans only use 0.3% of the water on earth. The other 99.7 percent is in the oceans, soils, icecaps, and floating in the atmosphere.
How many moles are present in 54.8 mL of mercury if the density of mercury is 13.6 g/mL?
Answer:
3.72 mol Hg
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisDensity = Mass over VolumeExplanation:
Step 1: Define
D = 13.6 g/mL
54.8 mL Hg
Step 2: Identify Conversions
Molar Mass of Hg - 200.59 g/mol
Step 3: Find
13.6 g/mL = x g / 54.8 mL
x = 745.28 g Hg
Step 4: Convert
[tex]745.28 \ g \ Hg(\frac{1 \ mol \ Hg}{200.59 \ g \ Hg} )[/tex] = 3.71544 mol Hg
Step 5: Check
We are given 3 sig figs. Follow sig fig rules and round.
3.71544 mol Hg ≈ 3.72 mol Hg
On Stemscopes
take your time.
Rapid growth of algae in a pond is often the result of-
O loss of habitat due to commercial building.
O flooding that causes water level to rise.
O excess nutrients from fertilizer runoff.
O clogged river tributaries entering a lake.
Answer:
The answer is 3
Explanation:
The nutrients from fertilizer runoff is the most probable answer, because the other 3 dont contribute to algae growth
Answer:
excess nutrients from fertilizer runoff.
Explanation:
what is the ratio of atoms of potassium to atoms of oxygen
Based on the octet rule, phosphorus most likely forms a ________ ion.
A. P5+
B. P3+
C. P5-
D. P3-
E. P+
Based on the octet rule, phosphorus most likely forms a P³⁻ ion; option D.
What is the octet rule?The octet rule is a rule which describes the way in which atoms of elements behave in terms of electron arrangement or distribution in order to achieve stability.
The octet rule states that atoms of elements achieve stability when they have eight electrons in their valance shells.
It explains that atoms of elements will gain, lose or share a certain number of electrons in order to achieve the stable electronic configuration of the noble gases.
Phosphorus has five electrons in its valence shell and will accept three electrons in order to have an octet.
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3 HBr + Al(OH)3 ⇒ 3 H20 + AlBr
Answer:
Balanced equation: 3HBr + Al(OH)3 → 3H2O + AlBr3
Hydrogen Bromide + Aluminum Hydroxide = Water + Aluminum Bromide
Explanation:
Hoped this helped you but I wasn't sure was this what you were asking for!!!
Have a great day!!
It refers to the cracked sections of the earth's crust.
Answer:
Plates
Explanation:
The Earth's crust is broken up into sections called plates. Tectonic plates are on the mantle which allow them to move.
A piece of tin has a mass of 16.52 g and a volume of 2.26 cm3 what is the density of tin?
Answer:
The density of tin is 7.31 g/cm³.
Explanation:
Given that the formula of density is D = m/v where m represents mass and v is volume :
D = 16.52/2.26
D = 7.31 g/cm³ (3sf)
A student with a body temperature of 37°C holds a piece of
ice that has a temperature of -8°C.
Vhich statement best explains what happens?
A. Thermal energy transfers coldness from the student's hand to the
ice.
B. Thermal energy transfers heat from the student's hand to the ice.
C. Heat transfers thermal energy from the student's hand to the ice.
D. Heat transfers coldness from the ice to the student's hand.
Answer:
D i think. Not sure.
Explanation:
I mean i just did it myself, and i dont really do chemistry, but I would say D sorrry if i made you get it wrong!!
Answer:
C. Heat transfers thermal energy from the student's hand to the ice.
Explanation:
I got it right on my test apix
50 POINTS!!! DUMB ANSWERS WILL BE DELETED
explain earth rotation and how days and nights are shifted
Answer:
Hope this isnt dumb!
Explanation:
Earth rotates on a axle this causes us to experience a day and night moment but however Earth's axis is tilted 23.5 degrees the and angled to measure between Earth's equatorial plane in the plane in which orbits are sun.
Answer:
The Earth rotates on it's axis, and it takes 24 hours for the Earth to go all the way around. When the part of the Earth you're on is facing the sun, you have daytime. When the part of the Earth you're on is not facing the sun (facing the moon instead), you have nighttime.
I hope this helps!
Lana is testing her hypothesis that marigolds grow faster in red light than in yellow light. If the plants in yellow light grow faster during her experiment what should Lana do next? A. Assume that she made a mistake during the experiment B. Report that her hypothesis was useless C. Conclude that the experiment did not work D. Repeat the experiment to confirm the result
If the plants in yellow light grow faster during her experiment, Lana should repeat the experiment to confirm the result. Option D.
Testing hypothesesIn science, hypotheses are tested using experiments. Two hypotheses are usually formed during the course of experimentation:
Null hypothesisAlternate hypothesisThe null hypothesis is set up to either be accepted is found to be true or rejected if found to be false. The alternate hypothesis is just there for guidance.
Hypotheses being found not to be true does not always mean that the reverse will be true.
Thus, if a complete opposite is obtained during testing, the next thing would be to repeat the experiment in order to be double sure there was not a mistake.
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How many grams of sodium hydroxide is exactly required to react with 3.86 mol of sulfuric acid?
Answer:
20.4g NaOH
Explanation:
Because, trust the drip, trust the drip
How many hydroxide ions are bonded to each aluminum ion?
Answer:
3
Explanation:
edge 2020
There are 3 hydroxide ions bonded to each aluminum ion.
Aluminum belongs to the 13th group of the periodic table. It has 13 electrons in the orbitals. According to the electron distribution rule, there are 3 valence electrons in the aluminum ion.
In the molecule of hydroxide, the oxygen has 5 valence electrons capable of the formation of the double bond. The bonding of the hydroxide ion with the aluminum ion will complete the octet of Aluminum and oxygen by the formation of the double bond.
So Aluminum can form 3 bonds with hydroxide ions. 2 double contributing to 4 electrons and 1 single bond completing the octet of Aluminum.
Thus Aluminum can form 3 bonds with hydroxide ions.
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Write balanced net ionic equations and the corresponding equilibrium equations for the stepwise dissociation of the triprotic acid H3PO4.
Answer:
[tex]H_3PO_4(aq)+H_2O(l)\rightleftharpoons H_3O^+(aq)+H_2PO_4^{-}(aq); \ Ka_1[/tex]
[tex]H_2PO_4^{-}(aq)+H_2O(l)\rightleftharpoons H_3O^+(aq)+HPO_4^{-2}(aq); \ Ka_2[/tex]
[tex]HPO_4^{-2}(aq)+H_2O(l)\rightleftharpoons H_3O^+(aq)+PO_4^{-3}(aq); \ Ka_3[/tex]
Explanation:
Hello!
In this case, since the phosphoric acid is a triprotic acid, we infer it has three stepwise ionization reactions in which one hydrogen ion is released at each step, considering they are undergone due to the presence of water, thus, we proceed as follows:
[tex]H_3PO_4(aq)+H_2O(l)\rightleftharpoons H_3O^+(aq)+H_2PO_4^{-}(aq); \ Ka_1[/tex]
[tex]H_2PO_4^{-}(aq)+H_2O(l)\rightleftharpoons H_3O^+(aq)+HPO_4^{-2}(aq); \ Ka_2[/tex]
[tex]HPO_4^{-2}(aq)+H_2O(l)\rightleftharpoons H_3O^+(aq)+PO_4^{-3}(aq); \ Ka_3[/tex]
Moreover, notice each step has a different acid dissociation constant, which are quantified in the following order:
Ka1 > Ka2 > Ka3
Best regards!
What is the enthalpy for reaction 1 reversed?reaction 1 reversed: N2O4→N2 + 2O2
Express your answer numerically in kilojoules per mole.
Answer:
8kJ/mol
Explanation:
since the forward reaction is -8kJ/mol, the backward reaction has the same enthalphy but reversed
The enthalpy of the reaction is 8kj/mol because it is a reversed reaction.
Since the forward reaction is -8kj/mol, thebackward enthalpy will be 8kj/mol.
What is Enthalpy?Enthalpy is refers to the total sum of the internal energy that is sum up to the product of the pressure and volume in a system of reaction.
Therefore, The enthalpy of the reaction is 8kj/mol because it is a reversed reaction. Since the forward reaction is -8kj/mol, the backward enthalpy will be 8kj/mol.
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What is the number of moles in 0.025g (NH4)2Cr2O7
Answer:
9.91 X 10^-5 or 0.000099 mol
Explanation:
Where does condensation occur?
A. atmosphere
B. lithosphere
C. biosphere
D. hydrosphere
~~Please explain~~ :)
Answer:
A. Atmosphere
Explanation:
hope this helps
The first step in mitosis is:
chromosomes pull away from each other
the nucleus of the cell forms
a cell splits apart
a second set of chromosomes is produced
Answer:
It is D. a second set of chromosomes is produced
Explanation:
Hope this helped have an amazing day!
How is coffee, Lemonade, Soda, Vinegar, Orange Juice an acid?
Answer:
Curd, lemon juice, orange juice and vinegar taste sour. These substances taste sour because they contain acids. The chemical nature of such substances is acidic. The word acid comes from the Latin word acere which means sour.
What is the value of freezing point depression of a solution of 15.0g of NaCl in 250g of water?
Answer:
-3.82ºC is the freezing point of solution
Explanation:
We work with the Freezing point depression to solve the problem
ΔT = m . Kf . i
ΔT = Freezing point of pure solvent - freezing point of solution
Let's find out m, molality (moles of solute in 1kg of solvent)
15 g / 58.45 g/mol = 0.257 moles of NaCl
NaCl(s) → Na⁺ (aq) + Cl⁻(aq)
i = 2 (Van't Hoff factor, numbers of ions dissolved)
m = mol /kg → 0.257 mol / 0.250kg = 1.03 m
Kf = Cryoscopic constant → 1.86 ºC/m (pure, for water)
0ºC - Tºf = 1.03m . 1.86ºC/m . 2
Tºf = -3.82ºC
Anyone know what room temperature lemon juice feels like it's for a project and I don't have it. Will give brainly!!!!
Answer:
Since both hot and cold temperature extremes can negatively affect the enzymes, vitamins, and nutrients in lemons when making lemon water, room temperature water between 68 degrees to 79 degrees Fahrenheit is the best option.
Explanation:
hope it helps you