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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How can flame color identify an unknown metal?
How can a spectrum positively identify an element?
How can astronomers tell which elements a star contains without a sample of it?
Define a salt bridge. Question 6 options: A pathway between the cathode and anode in which ions are oxidized. A pathway by which counterions can flow between the half-cells without the solutions in the half-cell totally mixing. A pathway in which no ions flow. A pathway between the cathode and anode in which ions are reduced. A pathway, composed of salt water, that ions pass through.
Answer:
A pathway by which counterions can flow between the half-cells without the solutions in the half-cell totally mixing.
Explanation:
In a voltaic cell, oxidation occurs at the anode and reduction occurs at the cathode.
Hence, there is a build up of positive ions at the anode and a build up of negative ions at the cathode. This tends to disrupt the electrical neutrality of the half cells.
Hence, there is a need for negative ions in the salt bridge to flow towards the anode and positive ions in the salt bridge to flow towards the cathode in order to maintain the electrical neutrality of the cells.
Hence, a salt bridge provides a pathway by which counterions can flow between the half-cells without the solutions in the half-cell totally mixing.
For each process, predict the sign on the entropy change and write a sentence or two to explain how to make this prediction without completing any mathematics. a.A solid melts. b.A vapor is converted into a solid. CH 117 Recitation Name: _________________________________ ~ 196 ~ c.A liquid freezes. d.A solid sublimes e.A vapor condenses to a liquid. f.A liquid boils. g.Dissolving a tablespoon of salt in water. h.Combustion of gasoline.
Answer: a. A solid melts: [tex]\Delta S=+ve[/tex]
b. a vapor is converted to solid: [tex]\Delta S=-ve[/tex]
c. a liquid freezes: [tex]\Delta S=-ve[/tex]
d. A solid sublimes: [tex]\Delta S=+ve[/tex]
e. a vapor condenses to liquid : [tex]\Delta S=-ve[/tex]
f. a liquid boils: [tex]\Delta S=+ve[/tex]
g. dissolving a tablespoon of salt in water: [tex]\Delta S=+ve[/tex]
h. combustion of gasoline: [tex]\Delta S=+ve[/tex]
Explanation:
Entropy is the measure of randomness or disorder of a system. If a system moves from an ordered arrangement to a disordered arrangement, the entropy change is negative and vice versa.
a. A solid melts: The solid is converting to liquid, thus the randomness is increasing as the molecules are moving away and the intermolecular forces are getting weaker. Thus the entropy change [tex](\Delta S)[/tex] is positive.
b. a vapor is converted to solid: The gas is converting to solid, thus the randomness is decreasing as the molecules are moving close and the intermolecular forces are getting stronger Thus the entropy change [tex](\Delta S)[/tex] is negative.
c. a liquid freezes: The liquid is converting to solid, thus the randomness is decreasing as the molecules are moving close and the intermolecular forces are getting stronger. Thus the entropy change [tex](\Delta S)[/tex] is negative.
d. A solid sublimes: The solid is converting to gas, thus the randomness is increasing as the molecules are moving away and the intermolecular forces are getting weaker. Thus the entropy change [tex](\Delta S)[/tex] is positive.
e. a vapor condenses to liquid : The gas is converting to liquid, thus the randomness is decreasing as the molecules are moving close and the intermolecular forces are getting stronger. Thus the entropy change [tex](\Delta S)[/tex] is negative.
f. a liquid boils: The liquid is converting to gas, thus the randomness is increasing as the molecules are moving away and the intermolecular forces are getting weaker. Thus the entropy change [tex](\Delta S)[/tex] is positive.
g. dissolving a tablespoon of salt in water: The solid is converting to ions , thus the randomness is increasing as the ions can move freely. Thus the entropy change [tex](\Delta S)[/tex] is positive.
h. combustion of gasoline: The liquid is converting to gas, thus the randomness is increasing as the molecules are moving away and the intermolecular forces are getting weaker. Thus the entropy change [tex](\Delta S)[/tex] is positive.
What volume would 75.0g of oxygen gas occupy
Answer:
Explanation: It is already known that 1 mole of the gas( or 32g of O2) is equivalent to 22.4 Litres of the oxygen gas. So, 8g is equivalent to = (22.4/32) × 8 = 5.6 L of the gas.
WILL AWARD BRAINLIEST! I NEED HELP PLEASE! Match the states of matter for each of the five lines below.
Answer:
see explanations
Explanation:
The graphic is the heating curve for water. Note that it is divided into 5 distinct heat flow segments. The segments with changing slopes are single phase segments with changes in temperature values. From left to right segment A is solid ice being warmed to it's melting point. Segment B is the melting segment in which 2 phases are in contact (solid + liquid). Note that addition of heat does not change the temperature. Segment C is warming of the liquid (single phase) up to its boiling point. At the boiling point the liquid begins to pass into the gas phase and again 2 phases are in contact; i.e., liquid & gas. Note again when two phases are in contact no temperature change occurs. Finally, segment E is the heating of the pure, single phase gas.
In summary ...
Segment A => heating single phase (solid) ice up to melting pt.
Segment B => melting of ice => 2 phases in contact (s & l) ΔT = ∅.
Segment C => heating single phase (liquid) water up to boiling pt.
Segment D => boiling of liquid => 2 phases in contact (l & g). ΔT = ∅.
Segment E => heating single phase (steam) up to desired temperature.
For what it's worth, the equation for the segments that show increasing temperature values is q = mcΔT (m= mass, c = specific heat & ΔT temp change.
The segments with zero slopes (horizontal lines) are defined by equations q = m·ΔHₓ where m = mass & ΔHₓ = heat of fusion (a constant = 335 j/g). The same is true for the line at 100°C where q = m·ΔH(v) where m = mass & ΔH(v) is the heat of vaporization (a constant = 2259 j/g.
Calculations involve calculating the amount heat transfer for each segment individually and then adding the heat values to obtain the total heat transfer.
If you need more instruction on this topic, kick back a note and I'll try to help clarify. Good Luck, Doc :-)
Answer:
Picture attached has answers
Explanation:
Electrophilic substitution occurs
Answer:
I hope it's helpful for you....
Explanation:
Electrophilic substitution reactions are chemical reactions in which an electrophile displaces a functional group in a compound, which is typically, but not always, a hydrogen atom.
What is the cation in KF?
Answer:
K, or Potassium
Explanation:
Why are half-reactions used in redox reactions?
Answer:
Because a redox reaction holds for both oxidation and reduction.
One half equation is of oxidation and the other is of reduction.
When these two half equations are combined, we get an overall equation of the redox reaction.
Question 10
1 pts
Given the following balanced chemical equation:
2C2H10 + 902 +4CO2 + 10H2O
How many grams of C2H10 are needed to produce 150. g of water?
396 g
15.8 g
O 1420
O 56.8 g
Answer:
56.8 g
Explanation:
Your first conversion factor is the molar mass of H2O to convert from grams of water to moles. Your second conversion factor is the mole ratio of 2 mol C2H10 for every 10 mol H2O. Your last conversion factor is the molar mass of C2H10 to convert from moles back to grams.
150. g H2O • (1 mol H2O / 18.02 g H2O) • (2 mol C2H10 / 10 mol H2O) • (34.1 g C2H10 / 1 mol C2H10) = 56.8 g C2H10
A gas under a pressure of 9.86 kPa and at a temperature of 75°C occupies a 500.0L container. How many moles of gas are in the container?
Answer:
1.7 mol
Explanation:
This is an ideal gas problem. So many units! That's the tip-off usually.
PV=nRT
First convert kPA to atm 1 atm=101.3 kPA so 9.86/101.3 = .097311 atm
(.097311 atm x 500L) = n · 0821 L·atm/mol·K · 348K
Do your multiplication then divide to get n alone and you should get 1.7 mol
Which type of substances do you separate into ions when writing the complete ionic equation?
a. Aqueous
b. Liquid
c. Gas
d. Solid
Answer:
a. Aqueous
Explanation:
Took the test
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A condition in which bones become weak and brittle.
The body constantly absorbs and replaces bone tissue. With osteoporosis, new bone creation doesn't keep up with old bone removal.
thus 2) is correct.
a disease in which bone tissue becomes breakable and thin.
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Think
about the physical properties used to identify elements as either metal,non-metals, or metalloids. Write
Imagine that you are asked to classify a group of elements as either metal, non-metals, or metalloids.
Explain how you would use their physical properties to accomplish this task.
Be sure to –Address the prompt, provide support, and conclude your thoughts. Write legibly and concisely.
Answer:
The elements can be classified as metals, nonmetals, or metalloids. ... Elements are further classified into metals, non-metals, and metalloids based on their properties, ... when they undergo chemical reactions They normally do not accept ... Most metal oxides are basic oxides and dissolve in water to form .
Explanation:
A student prepares a aqueous solution of butanoic acid . Calculate the fraction of butanoic acid that is in the dissociated form in his solution. Express your answer as a percentage. You will probably find some useful data in the ALEKS Data resource.
Answer:
15.4%
Explanation:
If Ka = 0.54 mM = 1.51x10⁻⁵
Then;
C₄H₈O₂ --------> C₄H₇O₂⁻ + H⁺
I 0.54x10⁻³ 0 0
E 0.54x10⁻³(1-x) 0.54x10⁻³x 0.54x10⁻³x
Recall that x is the percentage degree of dissociation
From the ICE table;
Ka = [C₄H₇O₂⁻] [ H⁺]/[C₄H₈O₂]
1.51x10⁻⁵=(0.54x10⁻³x) (0.54x10⁻³x)/ 0.54x10⁻³(1-x)
1.51x10⁻⁵ = 0.54x10⁻³x^2/1-x
1.51x10⁻⁵(1-x) = 0.54x10⁻³x^2
1.51x10⁻⁵ - 1.51x10⁻⁵x = 0.54x10⁻³x^2
Hence;
0.54x10⁻³x^2 + 1.51x10⁻⁵x - 1.51x10⁻⁵=0
x^2 + 0.028x - 0.028 = 0
Solving the quadratic equation here;
x = 0.154 or −0.182
Ignoring the negative result, x = 0.154
Hence, fraction of butanoic acid that is in the dissociated form in this solution = 15.4%
a freshwater stream flows into the ocean as shown in the diagram which statement correctly describes how the stream affects these salinity of the ocean
A- salinity increases because the stream adds salt to the ocean.
B- salinity decreases because the stream adds freshwater to the ocean
C- salinity increases because of stream adds freshwater to the ocean
D- salinity Remains the Same because the stream adds freshwater to the ocean
Which combination of atoms is most likely to produce a compound
with ionic bonds?
Answer: In an ionic bond, one atom donates an electron to another atom. This stabilizes both atoms. Because one atom essentially gains an electron and the other loses it, an ionic bond is polar. In other words, one atom in the bond has a positive charge, while the other has a negative charge. Often, these atoms dissociate into their ions in water. Atoms that participate in ionic bonding have different electronegativity values from each other. If you look at a table of electronegativity values, it is apparent ionic bonding occurs between metals and nonmetals. Examples of compounds with ionic bonds include salt, such as table salt (NaCl).
is pyramidal molecular geometry?
A. N2
B. H2O
C. NH3
D. CCL4
Answer:
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Is pyramidal molecular geometry?[tex]\color{Blue}\huge\boxed{Answer} [/tex]
B.H2OWhat is another name for a mole?
O A. Rutherford's number
O B. Mendeleev's number
O C. Dalton's number
D. Avogadro's number
Answer: D Avogadro’s Number
Explanation:
Another name for a mole is Avogadro's number. option D) is correct.
What is a Mole?
A mole refers to the amount of a substance that contains as many elementary units as can be found in 12g of Carbon-12. It can also be a number of a substance /particles, such as atoms or ions. molecules or electrons. The number of particles is approximately 6.02* 10²³ in magnitude and is called Avogadro's number of particles. it can be denoted with 'mol'.
Formula for calculating mole.
n = N/Nₐ
Where,
n = number of moles of the substance (or elementary entity)
N = total number of elementary entities in the sample
Nₐ= Avogadro constant.
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A 0.530 M Ca(OH)2 solution was prepared by dissolving 36.0 grams of Ca(OH)2 in enough water. What is the total volume of the solution thus formed? (4 points)
Answer:
0.917 L
Explanation:
Step 1: Given data
Molar concentration of the solution (M): 0.530 M (0.530 mol/L)Mass of Ca(OH)₂ (solute): 36.0 gStep 2: Calculate the moles corresponding to 36.0 g of Ca(OH)₂
The molar mass of Ca(OH)₂ is 74.09 g/mol.
36.0 g × 1 mol/74.09 g = 0.486 mol
Step 3: Calculate the volume of the solution
Molarity is equal to the moles of solute divided by the liters of solution.
M = moles of solute / liters of solution
liters of solution = moles of solute / M
liters of solution = 0.486 mol / (0.530 mol/L) = 0.917 L
Answer:
0.917 liters
Hope this helps! :D
Explanation:
5.
(08.02 MC)
A 0.530 M Ca(OH)2 solution was prepared by dissolving 36.0 grams of Ca(OH)2 in enough water. What is the total volume of the solution thus formed? (4 points)
1.
Why are kilometers not a good unit of measurement in space?
T.
2.
What distance measurement unit is used for objects within our solar system?
astronomical
units
3.
How many kilometers are in one astronomical unit?
4.
What distance measurement unit is used for objects outside of our solar
system?
_light
year!
5.
How many kilometers are in one light-year? I
How far away is the nearest star to Earth other than our Sun?
6.
7.
How far away is the center of the Milky Way Galaxy from Earth?
8.
What is the diameter of the Milky Way Galaxy?
We measure force in units called
3.
Why do you suppose internet service costs a lot of money?
Answer:
Why does internet cost so much? Equipment and installation: One of the main reasons for internet prices to run high is the cost of equipment and installation in new service areas. Fiber optic cables are expensive, so fiber optic internet providers may have higher prices to recoup the costs of installing new lines.Apr 21, 2021Explanation:
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.
explain what is ment by solvent front
Answer:
In paper chromatography, the wet moving edge of the solvent that progresses along the surface where the separation of the mixture is occurring.
Explanation:
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What is a renewable resource on Earth?
minerals
coal
wind
petroleum
Answer:
Wind
Explanation:
Wind turbines make energy by the movement of the natural force on earth called 'wind' and renewable resources are resources that can be made from natural and environment-safe objects or things (e.g. Water, Geothermal Heat, The Sun, and Wind)
How are cells organized?
A: Organs
B: Organelles
C: Tissues
Answer:
tissues,organs, organelles
Which equation represents a double replacement reaction? A) 2Al(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2(g) B) 2Al(s) + 3Cl2(g) - 2AlCl3(s) C) 2AlCl3(s) + 2Al(s) + 3Cl2(g) D) AlCl3(aq) + 3KOH(aq) - Al(OH)3(s) + 3KCl(aq)
Answer:
D) AlCl₃(aq) + 3 KOH(aq) → Al(OH)₃(s) + 3 KCl(aq)
Explanation:
Which equation represents a double replacement reaction?
A) 2 Al(s) + 6 HCl(aq) → 2 AlCl₃(aq) + 3 H₂(g)
No, this is a single replacement reaction, in which Al replaces H in its acid.
B) 2 Al(s) + 3 Cl₂(g) → 2 AlCl₃(s)
No, this is a synthesis reaction, in which two simple substances combine to form a compound.
C) 2 AlCl₃(s) → 2 Al(s) + 3 Cl₂(g)
No, this is a decomposition reaction, in which a compound decomposes into simple substances.
D) AlCl₃(aq) + 3 KOH(aq) → Al(OH)₃(s) + 3 KCl(aq)
Yes, this is a double replacement reaction, in which both reactants exchange their cations and anions.
Which one(s) are correct for ionic naming? Select all that apply.
O dicopper trichloride
O iron sulfide
O nickel Il carbonate
O strontium iodide
O carbon dioxide
Which product will precipitate in the following reaction:
CaCl2 + Na2CrO4 → CaCrO4 + 2 NaCl
A.NaCl
B.CaCrO4
C.Na2CrO4
D.CaCl2
Answer:
a
Explanation:
Name (3) ways an animal can use energy from food?
Answer:
The food chain begins with the sun: plants get their energy by photosynthesizing sunlight into energy, and then herbivores eat those plants to get their energy. Carnivores who then eat the herbivores are getting that sunlight passed along from sun to plant to herbivore to carnivore.