a.
Initial moles of (CH₃CH₂)₃N = (0.1000 mol/L) × (20.00/1000 L) = 0.002 mol
Moles of HCl added = (0.1000 mol/L) × (13.00/1000 L) = 0.0013 mol
Addition of 1 mole of HCl reacts with 1 mole of (CH₃CH₂)₃N to 1 mole of (CH₃CH₂)₃NH⁺.
After addition of 13.00 mL of HCl:
Moles of (CH₃CH₂)₃N left unreacted = (0.002 - 0.0013) mol = 0.0007 mol
Moles of (CH₃CH₂)₃NH⁺ produced = 0.0013 mol
Hence, [(CH₃CH₂)₃NH⁺]/[(CH₃CH₂)₃N] = 0.0013/0.0007 = 13/7
Consider the dissociation of (CH₃CH₂)₃N:
(CH₃CH₂)₃N(aq) + H₂O(l) ⇌ (CH₃CH₂)₃NH⁺(aq) + OH⁻(aq) …… Kb = 5.2 × 10⁻⁴
Henderson-Hasselbalch equation:
pOH = pKb + log([(CH₃CH₂)₃NH⁺]/[(CH₃CH₂)₃N])
pOH = -log(5.2 × 10⁻⁴) + log(13/7) = 3.55
pH = pKw - pOH = 14.00 - 3.55 = 10.45
====
b.
Initial moles of (CH₃CH₂)₃N = 0.002 mol
Moles of HCl added = (0.1000 mol/L) × (20.80/1000 L) = 0.00208 mol
HCl is in excess.
Moles of HCl left unreacted = (0.00208 - 0.002) mol = 0.00008 mol
Volume of the final solution = (20.00 + 20.80) mL = 40.8 mL = 0.0408 L
In the final solution:
[H₃O⁺] = [HCl] = (0.00008 mol) / (0.0408 L) = 0.00196
pH = -log[H₃O⁺] = -log(0.00196) = 2.71
====
c.
Initial moles of (CH₃CH₂)₃N = 0.002 mol
Moles of HCl added = (0.1000 mol/L) × (29.00/1000 L) = 0.0029 mol
HCl is in excess.
Moles of HCl left unreacted = (0.0029 - 0.002) mol = 0.0009 mol
Volume of the final solution = (20.00 + 29.00) mL = 49 mL = 0.049 L
In the final solution:
[H₃O⁺] = [HCl] = (0.0009 mol) / (0.049 L) = 0.0184
pH = -log[H₃O⁺] = -log(0.0184) = 1.74
. How many grams of lithium are formed from the reaction if you begin with 89.5
grams of copper?
Cu
+
Li2S --> 2 Li +
CUS
Answer:
179g
Explanation:
Molar ratio for Copper : Lithium is
1:2
If there are 89.5g of copper
Grams for Lithium= 89.5 × 2 = 179g of Lithium
The amount of lithium are formed from the reaction if you begin with 89.5 grams of copper is 19.6 grams.
How do we convert mass into moles?Mass can be converted into moles by using the below equation as:
n = W/M, where
W = given mass
M = molar mass
Moles of 89.5g of copper = 89.5g / 63.5g/mol = 1.4 mol
Given chemical reaction is:
Cu + Li₂S → 2Li + CuS
From the stoichiometry of the reaction, it is clear that
1.4 mole of Cu = produces 1.4 mole of CuS
1.4 mole of CuS = produced by 1.4 mole of Li₂S
1.4 mole of Li₂S = produces 2×1.4=2.8 moles of Li
Mass of 2.8 moles of Li = (2.8mol)(7g/mol) = 19.6g
Hence resultant mass of lithium is 19.6g.
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Given a volume of 47.8 mL of gas at STP, _______________ moles of O2 exist
A cork cell was first observed by Robert Hooke in the year:
O 1556
O 1065
O 1965
O 1665
Answer:
1665
Explanation:
In 1665, Robert Hooke was the first to observe cork cells and their characteristic hexagonal shape, using the first optical microscope, which was invented by him at that time.
Which statement describes a physical property of copper?
Answer:
Copper is typically a solid and has a coppery, bronzy color. It is a metal and has a relatively high melting point. It has a strong luster and can conduct electricity.
Answer:
RESHAPE BY A FORCE.
Explanation:
1. It can be reshaped by a force. Physical property can be observed and measured without any changes in molecular composition.
2. A physical property is one that can be change without altering the identity of the substance. These set of properties is not concentration dependent they are use to describe matter. Example are: density, solubility, melting point and color and odor. For this case the second option seems to fit the description it can be reshape by force.
Knives should be stored in cluttered drawers.
True or false
Amir observes Wave 1 and Wave 2 crashing into each other at two different intervals. His experiments produce Wave 3 and Wave 4. Amir records his data in a table.
A 2-column table with 4 rows titled Amir's Waves. The first column labeled Wave has entries 1, 2, 3, 4. The second column labeled Information has entries Amplitude of 6 centimeters, Amplitude of 4 centimeters, Amplitude of 7 centimeters, Amplitude of 3 centimeters.
What is the best statement about the data collected in Amir’s table?
Wave 3 resulted from destructive interference, and Wave 4 resulted from constructive interference.
Waves 3 and 4 resulted from constructive interference.
Waves 3 and 4 resulted from destructive interference.
Wave 3 resulted from constructive interference, and Wave 4 resulted from destructive interference.
Answer:
d
Explanation:
wave a and b clashing constructively would make c a bigger wave and clashing destructively would make d a smaller wave, which they are.
Answer:
d
Explanation:
Pls help I need help ASAP!!! Be accurate
Use Lewis theory to determine the chemical formula for the compound formed between Mg and Br. Group of answer choices Mg3Br2 Mg2Br3 Mg2Br MgBr2 MgBr
Answer:
MgBr2
Explanation:
(Mg^2+) + (Br^1-)
For every Mg we need 2 Br to balance out the compound.
Since magnesium has two outer electrons, it can donate one electron each to two bromine atoms having seven outer electrons in order for each of the atoms to have a complete octet.
Since the octet rule states that a stable atom must have eight electrons in its outermost shell, it follows that magnesium could give out two of its outermost electrons to two bromine atoms.
When that happens, each bromine atom which previously had seven electrons now have eight electrons, satisfying the octet rule. The correct formula of the compound is MgBr2.
Learn more: https://brainly.com/question/11527546
There is a bottle of KCl solution: the volume is 35 mL; its molarity is 3.0 M.
After diluting it into final volume 200 mL, what is the molarity (in M) now?
Answer:
0.525 M
Explanation:
As the problem deals with a dilution process, we can use the following formula:
C₁V₁=C₂V₂Where subscript 1 stands for initial concentration and volume, while 2 stands for the final conditions. Meaning that in this case:
C₁ = 3.0 MV₁ = 35 mLC₂ = ?V₂ = 200 mLWe input the data given by the problem:
3.0 M * 35 mL = C₂ * 200 mLAnd solve for C₂:
C₂ = 0.525 MWhat is the force being applied to an object with a mass of 12 KG and an acceleration of 4M/S
Answer:
48 newtons
Explanation:
A report for a written communication?
Answer:
It is a document that promotes essential communications, such as communications organizations.
Explanation:
There are several models of written report for communicating. Reports are documents widely used in organizations, whose communication is an essential tool for the correct flow of business. Some of them are written in the form of e-mails, memos, letters, etc.
The reports assist in business communication and must be written in the format and specific subject for the recipient.
The company's need to issue written reports is to assist in the organization of the business, in planning, in decision-making, and in everything that concerns the operationalization of organizational systems.
Calculate the mass of an object that is accelerating 14 M/S to a force of 280N
Answer:
20 KG
Explanation:
Answer:
20 kg
Explanation:
F = ma
F = 280 N
a = 14 m/s^2
m = F/a = 280/14 = 20 kg
Please help with this one
Answer:
15g
Explanation:
hope this helped
Which of the following galaxies do not have a regular structure?
A. Elliptical and barred spiral galaxies
B. Irregular and elliptical galaxies
C. Spiral galaxies
D. Irregular galaxies
Answer: D
Explanation: Irregular galaxies
Answer:
Your answer is D
Explanation:
Irregular galaxies do not have a regular structure.
what evidence Have you collected to explain The relationship between the seafloor Ready mid ocean ridges and ocean trenches
Answer:Abundant evidence supports the major contentions of the seafloor-spreading theory. First, samples of the deep ocean floor show that basaltic oceanic crust and overlying sediment become progressively younger as the mid-ocean ridge is approached, and the sediment cover is thinner near the ridge.
Explanation:
Please could you help me with this question
(No links or spam)
Will give brainliest if correct
Answer:
first one pure
second one mixture..
Ali says the climate of a town is rainy because it is raining outside today. Is she correct? In one or two sentences, explain why Ali is or is not correct about the climate of the town.
Answer:
Ali is incorrect.
Explanation:
Ali is wrong because the climate is a study of the weather pattern over a long period of time. You cannot look outside one day and determine the climate because the climate is long-term.
She could say the weather is rainy, because that is short term, but not the climate.
What is the cation in KF?
Answer:
K, or Potassium
Explanation:
The nucleus inside a eukaryotic cell has ________ that contains cell's DNA.
A. bacteria
B. chromosomes
C. electron
O D. hair
What is the pressure inside a container of 3 moles of gas with a volume of 60 Liters at a temperature of 400 K?
I just need the answer not a link please :)
In terms of percentages, what are the 3 biggest uses of natural gases?
1) Using Gas In The Home. In our homes, we end up utilizing the material every day.
2) Use In The Industrial Sector. The industrial sector makes similar use of natural gas liquids as a fuel for process heating and raw material to produce chemicals, fertilizers, and hydrogen.
3) Transportation.
Hope this helps. Btw, I love ur pfp!
Answer:
1) Using Gas In The Home. In our homes, we end up utilizing the material every day. ...
2) Use In The Industrial Sector. The industrial sector makes similar use of natural gas liquids as a fuel for process heating and raw material to produce chemicals, fertilizers, and hydrogen.
3) Transportation.
Determine the molar mass of a compound that has a density of 1.25 g/L at
STP. *
*
Answer:
So, weight per litre (1.25g/l) times 22.4 l/mole equals the mole weight (28 g/mole).
the color of an object that absorbs all colors except red
Answer:
The color black absorbs most colors, while white reflects most colors.
Which of these actions increases enthalpy in the air molecules of the Earth's
atmosphere?
A. The air being heated by the sun
B. Trees being planted in the rain forests
C. Carbon dioxide being taken in by plants during photosynthesis
D. People breathing in oxygen
HELP PLS
Answer:
The air being heated by the sun
Explanation:
Just took the quiz
Answer:
The answer is A (the air being heated by the sun)
Explanation:
A P E X
Do not abuse or misuse any piece of drawing instrument. ASAPPPP
What happens to the solar energy absorbed by plants during photosynthesis ?
Answer:
Photosynthesis in plants converts solar energy into chemical energy using electrons and protons from water. in plants involves a series of steps and reactions that use solar energy, water, and carbon dioxide to produce organic compounds and oxygen.
Explanation:
Answer:
its is used to make sugar which plants eat think it goes through like glycose or something
Explanation:
Is anyone good at chemistry if so can someone help me please ?
(NO LINKS)
The reactions are a bit poorly written. While it's true that aqueous H₂CO₃ is produced in this neutralization reaction, the H₂CO₃ rapidly decomposes to yield CO₂(g) and H₂O(l). Writing the product as H₂CO₃(aq) in the net ionic equation is unnecessarily confusing since it portrays the substance as nonionizing yet water-soluble.
In any case, the Na⁺ and the Cl⁻ are the spectator ions here.
give a description of arecent (2018-2020) example of how this problem has displayed itself in your community
Answer:
im not sure go with the first
Explanation:
How many atoms are in 20.4 g of beryllium
Explain in detail how low density polyethylene is made
Answer:
Low-density polyethylene is manufactured by the process of the polymerization of ethylene at very high temperatures in a tubular reactor. In this tubular reactor, high-pressure polymerization allows further copolymerization of ethylene with polar co-monomers. The tubular process has an advantage over autoclave process.
Explanation:
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