1. 0.134 g of Cr is plated out after 2.20 days.
2. 1.39 A of current is required to plate out 0.250 mol Cr in 8.60 h.
To calculate the mass of Cr plated out, we need to use Faraday's law of electrolysis, which states that the amount of substance plated out is directly proportional to the quantity of electricity passed through the solution.
The formula is:
moles of substance plated out = (current x time) / (96500 x number of electrons transferred)
For Cr, the number of electrons transferred is 3, so the formula becomes:
moles of Cr plated out = (6.00 A x 2.20 days x 24 h/day x 3600 s/h) / (96500 x 3)
Solving for moles, we get 0.250 mol. To convert to mass, we use the molar mass of Cr, which is 52.00 g/mol. Therefore, the mass of Cr plated out is:
mass of Cr = 0.250 mol x 52.00 g/mol = 13.0 g = 0.134 g
For the second part of the question, we need to rearrange the formula to solve for the current:
current = (moles of substance plated out x 96500 x number of electrons transferred) / (time)
Plugging in the values, we get:
current = (0.250 mol x 96500 x 3) / (8.60 h x 3600 s/h) = 1.39 A.
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When a Cr⁺³ solution is electrolyzed, the ions undergo a reduction reaction to form solid chromium on the cathode. The balanced equation for this reaction is:
2Cr⁺³ + 6e- → 2Cr(s)
To calculate the mass of chromium plated out after 2.20 days, we need to first determine the amount of charge (Q) that has passed through the cell:
Q = I × t
where I is the current in amperes and t is the time in seconds.
Converting 2.20 days to seconds:
2.20 days × 24 hours/day × 60 minutes/hour × 60 seconds/minute = 190,080 seconds
So, Q = 6.00 A × 190,080 s = 1.14 × 10⁺⁶ C
Next, we can use Faraday's law to calculate the amount of chromium plated out:
moles of e- = Q / F
where F is the Faraday constant (96,485 C/mol e-), so
moles of e- = 1.14 × 10⁺⁶ C / 96,485 C/mol e- = 11.8 mol e-
Since each mole of electrons reduces 2 moles of Cr⁺³ to form 1 mole of Cr, we have:
moles of Cr = 11.8 mol e- × 1 mol Cr⁺³ / 2 mol e- = 5.90 mol Cr
Finally, we can use the molar mass of chromium (52.0 g/mol) to calculate the mass of chromium plated out:
mass of Cr = 5.90 mol Cr × 52.0 g/mol = 307 g Cr
Therefore, after 2.20 days of electrolysis with a current of 6.00 A, 307 g of chromium is plated out.
To determine the amperage required to plate out 0.250 mol of Cr from a Cr⁺³ solution in 8.60 hours, we can use a similar approach.
First, we need to convert the time to seconds:
8.60 hours × 60 minutes/hour × 60 seconds/minute = 30,960 seconds
Next, we can use the same equation as before to calculate the amount of charge required:
Q = (0.250 mol × 3 mol e- / 2 mol Cr⁺³) × (96,485 C/mol e-) = 36,368 C
Finally, we can use the equation for current (I = Q / t) to find the required amperage:
I = 36,368 C / 30,960 s = 1.17 A
Therefore, a current of 1.17 A is required to plate out 0.250 mol of chromium from a Cr⁺³ solution in 8.60 hours.
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HELP!!!!!!!!
One use of CaCl 2 to salt roads in the winter. The equation that describes the change in freezing point of a solvent due to a solute is T f =i x K f x molality. How much would the freezing point decrease if a 3.23 molal (m) solution were achieved? (K f =1.86^ C/(mol/kg) for water and i = 3 for CaCl 2 )
Answer:
On contact with ice, calcium chloride forms brine rapidly, which lowers the freezing point of water and melts snow and ice quickly. Calcium chloride forms brine faster than other ice melters because its hygroscopic properties actually cause it to attract moisture from its surroundings
Explanation:
HOPE IT WILL HELP YOU
1) Write the symbol and charge for each individual ion
2) Balance the charge so that they equal to zero
3)Write the formula based on how many of each ion you used in step 2
6) Nitrogen and Barium
7) strontium and fluorine
8) iodine and calcium
9) magnesium and sulfur
10) Sulfur and aluminum
N -3
Ba +2
Sr +2
F -1
I -1
Ca +2
Mg +2
S -2
S -2
Al +3
//
Ba3N2
SrF2
CaI2
MgS
Al2S3
//
I don't really understand 2.
where did all the elements in the universe come from?
Answer:
Wal-mart XDDDDD
Explanation:
what's the formula for hypoarsenous acid?
Answer:
As(OH)3 or AsH3O3
Explanation:
HELPP PLEASEEEEEEEEEEEEE
Answer:
Potential energy I believe
Explanation:
Neon is a noble gas because it is stable non reactive and has ____ valence electrons
Answer:
8 .....................
Determine if you can swim in 1×10^27 molecules of water
How many grams of H,O are needed to produce 13 g of NaOH? 2 Na,O2 + 2 H20-4 NaOH + O2
Answer:
This is a typical stoichiometry question.To answer this question you want to get a relationship between
N
a
2
O and NaOH.
So you can get a relationship between the moles of
N
a
2
O
and moles of NaOH by the concept of stoichiometry.
N
a
2
O +
H
2
O ----------------> 2 NaOH.
According to above balanced equation we can have the stoichiometry relationship between
N
a
2
O and NaOH. as 1:2
It means 1 moles of
N
a
2
O is required to react with one mol of
H
2
O to produce 2 moles of NaOH.
in terms of mass 1 mole of
N
a
2
O has mass 62 g on reaction with water produces 2 moles of NaOH or 80 g of NaOH.
62 g of
N
a
2
O produces 80 g of NaOH.
1g of NaOH is produced from 62/80 g of
N
a
2
O
1.6 x
10
2
g of NaOH will require 62 x 1.6 x
10
2
g / 80 of
N
a
2
O
124g of
N
a
2
O.
Explanation:
There are three main parts to any dissolution which result in an energy change, either endothermic or exothermic. Consider the dissolution of sodium chloride and explain what each of these three major energy changes are.
Answer:
The dissolution of sodium chloride involves three steps. During the process energy changes occur in:
1. breaking apart the hydrogen bonds between water molecules,
2. breaking apart the electrostatic bonds between sodium and chloride ions, and
3. when bonds are formed between water molecules and aqueous ions in solution.
Since the energy used to break apart the hydrogen bonds between water molecules and the energy used to break apart the electrostatic bonds between sodium and chloride ions, is greater than the energy released when bonds are formed between water molecules and aqueous ions in solution, the dissolution of sodium chloride is endothermic.
Explanation:
The heat of solution or enthalpy of solution/dissolution, is the enthalpy change that occurs with the dissolution of a solute in a solvent at constant pressure, resulting in infinite dilution. Its unit is kJ/mol for reactions taking place under standard conditions (298.15 K and 1 atm).
The process of dissolution occurs in three energy-dependent steps:
1. The breaking of bonds within the solute. For example, electrostatic forces of attraction between two oppositely-charged ions. This process is endothermic.
2. The endothermic process of breaking of intermolecular forces within the solvent, e.g. hydrogen bonds in water.
3. The exothermic process of the formation of new solute-solvent bonds in solution.
The sum of the energies involved in these three steps gives the enthalpy of dissolution of a solute. The overall process of dissolution can either endothermic or exothermic depending on the amount of energy used or released in breaking and making bonds. If more energy is released in making than is used in breaking bonds, it is exothermic. However, if more energy is used in breaking bonds than is released in making bonds, dissolution is then endothermic.
For example, considering the dissolution of sodium chloride. During the process the energy used to break apart the hydrogen bonds between water molecules and the energy used to break apart the electrostatic bonds between sodium and chloride ions, is greater than the energy released when bonds are formed between water molecules and aqueous ions in solution. Therefore, the dissolution of sodium chloride is endothermic.
what is the correct answer ?
Answer:
Element with 6s subshell
Explanation:
Reactivity of an element depends on the electronic configuration and position of element in the periodic table as reactivity increases as we go down the periodic table.
This is so because number of shell increases as move down the periodic table and the last electron is further away from the nucleus.
Element with 6s subshell is the largest among 3s and 4s subshell and has more number of shells so it will react more than 3s and 4s subshell.
Hence, the correct answer is "Element with 6s subshell".
The solubility of AgNO3 at 10° and 20°C are 170g and 222g per 100g H2O. What is the sign of change of heat of solution for AgNO3?
Answer:
The sign of change of heat of solution is positive
Explanation:
The dissolution of AgNO3 in water is represented by the equation;
AgNO3(s) --------> Ag^+(aq) + NO3^-(aq)
We can see from the question that as the temperature was increased from 10° to 20°C the solubility of the solute increased from 170g to 222g per 100g of H2O.
This implies that the solubility of the solute increases with increase in temperature.
If a reaction moves in the forward direction when the temperature is increased, then the reaction is endothermic. If the reaction is endothermic, the sign of change of heat of solution is positive.
Help me please an thank you
Molecular formula
hope that helps^^
for 50 points!! im having a bit of trouble haha
Answer:
answer 16.1.) bohr model used to predict bonding abilities2.) electrical charge attraction holds atom together3.) valence electrons are outermost electrons4.) electron cloud - where electrons are foundanswer 17.falsebecause atomic number are numbers of protons
Anyone know how to do this?
Answer:I can’t see the question
Explanation:
Explain why dissolving is classified as a physical change.
Answer:
dissolving is classified as a physical change because it can be reversed back to its original form
explanation:
Dissolving is an example of a reversible change. For example, when salt is mixed with water it disappears because it dissolves in the water to make salty water. But we can get the salt can back again by boiling off the water. That leaves the salt behind.
What is the formula for copper(I) phosphate(v)
Answer:
Cu3PO4
Explanation:
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, Cu[tex]_3[/tex]PO[tex]_4[/tex] is the formula for copper(I) phosphate(v).
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond. Cu[tex]_3[/tex]PO[tex]_4[/tex] is the formula for copper(I) phosphate(v). Cu[tex]_3[/tex]PO[tex]_4[/tex] is an ionic compound with cation Cu⁺¹ and anion as PO₄³⁻.
Therefore, Cu[tex]_3[/tex]PO[tex]_4[/tex] is the formula for copper(I) phosphate(v).
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The Law of Superposition states
The specific heat of gold is 0.126 J/gºC. How much energy is released
when a 350 g sample of gold is cooled from 88.5°C to 24.6°C?
Explanation:
Specific heat capacity of gold (S)
= 0.126 J /kg°C
mass (m) = 350 g = 0.35 kg
difference in temperature (dt)
= 88.5°C - 24.6°C
= 63.9° C
Now
Energy released (Q)
= m*s*dt
= 0.35 * 0.126 * 63.9
= 2.81799 Joule
Hope it will help :)
Fill in the blank...
Each element is made up of only one kind of ________
what is the formula for the compound potassium chloride?
Answer:
KCl
Explanation:
hope this is correct and helps i did this last year in chem :)
[tex]\mathrm{KCl}[/tex]
I need help I'll mark you as Brainliest
Answer: c
Explanation:
What is true of experimental designs that are used in scientific research? The designs use the same steps in every kind of research. The designs follow a general method that is familiar to all scientists. The designs ensure that the experimental data supports the hypothesis. The designs are kept secret so that others must do their own experiments.. The answer is B.) "The designs follow a general method that is familiar to all scientists."
Answer:
The designs ensure that the experimental.
Explanation:
Scientific research refers to the-fact finding inquiry to answer the questions related to natural processes. A hypothesis is a situation or an assumption that needs to be proved by applying scientific produces. Experimental design refers to the methodology, which is applied to conduct research.
The designs ensure that the experimental data support the hypothesis is the true statement regarding experimental designs that are used in scientific research because an experimental design should be concerned with the fact that it is relevant or appropriate to prove a hypothesis.
Answer:
its c. the designs follow a general method that is familiar to all scientists
Explanation:
A lens is an instrument that can combine and focus light to a single point. The diagram below shows many different colors of light entering a lens and focusing on Point X. Which of the following BEST describes the effect the lens has on Point X?
Answer:
it should be the second one :)
Explanation:
Question 8
Using Henry's Law: Sz/P1-S2/P2
To increase the solubility of a gas at constant temperature and 202kPa pressure from
0.85g/L to 5.1g/L, the pressure would have to be increased to:
A.505kPa
B.17.2kPa
C.606kPa
D.1212kPa
Answer:
D
Explanation:
plug the numbers
An Advil® cold and sinus capsule has a volume of 210. Mm3. How many microliters (µL) of the drug are needed to fill the capsule? ( 1 L = 106 µL)
Answer:
210 microliters of drug are needed to fill the capsule
Explanation:
As given in the question
1 liter is equal to [tex]10^6[/tex] micro liters
Volume of Capsule [tex]= 210[/tex] cubic millimeter
1 cubic millimeter [tex]= 10^{-3}[/tex] cubic meter
1 cubic meter [tex]= 10^3[/tex] liters
1 micro liter [tex]= 10^{-6}[/tex] micro liters
Converting [tex]210[/tex] cubic millimeter to micro liter
[tex]= 210 * (10^{-3})^3 * 10^3 \\= 210 * 10^{-6}\\= 210[/tex]micro liters
Mars have more gravity than earth?
True or false?
Answer:
false
Explanation:
earth is larger than mars so it has more gravity
Answer: false
Explanation:
Which of the following questions will allow you to determine if a population of organisms are MOST LIKELY a result of natural or artificial selection? A. How similar are the organisms to their parents? B. How many different traits are there in the population of organisms? C. Do the organisms have traits that are valuable to humans but are poorly suited to the wild? D. Were the organisms produced by sexual or asexual reproduction?
Answer:c
Explanation:
In general, what causes a sea breeze?
O
A. The difference in density between land and water
B. The difference in cloud cover between land and water
Ο Ο Ο
C. The difference in specific heat capacity between land and water
D. The difference in elevation between land and water
Answer:
The usual cause of sea breeze is the difference in specific heat capacity between land and water Land heats and cools more quickly than water. What is the cause of a sea breeze? The air over the land is warmed and rises, to a greater temperature than that over the sea.
Explanation:
Your answer is C ! <3
The difference in specific heat capacity between land and water is the cause of sea breeze.
What is sea breeze?land and ocean heat up at different rates, sea breezes often occur during hot, summer days. The land surface warms up more quickly than the water surface during the day. As a result, the air above land is warmer than that over water.
Just to refresh your memory, warmer air is lighter than cooler air. Warm air rises as a result. As a result, the warmer air above the ground is rising. The cooler air above the water is moving across the surface of the land to replace the rising heated air as it rises over the land.
This is the sea breeze, which is seen at the top of the next picture. The land breeze that happens is seen at the bottom of the following picture.
Therefore, The difference in specific heat capacity between land and water is the cause of sea breeze.
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You are given 0.39 mol of niobium (Nb). How many grams of niobium do you have?
Answer:
36gNb
Explanation:
0.39 mol Nb*92.91g Nb/1 mol Nb=36 g Nb
You start with 100mL of 14M HNO3 and 10grams of copper metal. How many moles of the nitrogen dioxide gas will be produced?
Answer:
0.316 moles are produced.
Explanation:
We state the redox reaction:
4HNO₃ + Cu → Cu(NO₃)₂ + 2NO₂ + 2H₂O
We need to determine the limting reactant:
0.1 L . 14 M = 1.4 moles
10 g . 1mol/ 63.54g =0.158 mol
Cu is the limiting reactant. Let's see
4 moles of acid need 1 mol of Cu to react
1.4 moles of acid may react to (4 . 1) / 1.4 = 0.35 moles
We do not have enough Cu.
1 mol of Cu can produce 1 mol of NO₂
Then 0.158 moles will produce, 0.316 moles. (double of moles)
If we see stoichiometry, ratio is 1:2