How many moles of KI are present in 0.85L of a 0.55 M KI solution?
Answer: Amount of moles is 0.47 mol
Explanation: Amount of moles n = cV = 0.55 M · 0.85 l = 0.4675 mol
There are 0.4675 moles of KI in 0.85L of a 0.55 M KI solution
WHAT IS MOLARITY?
Molarity is a measure of the concentration of a solution. It is calculated by dividing the number of moles (n) of a solute by the volume of a solution (V)
Molarity = number of moles (n) ÷ volume (V)
According to this question, the molarity of a KI solution with a volume of 0.85L is 0.55 M. Hence, the number of moles of KI in the solution can be calculated as follows:
Molarity = n/V
0.55 = n/0.85
n = 0.55 × 0.85
n = 0.4675 moles
Therefore, there are 0.4675 moles of KI in 0.85L of a 0.55 M KI solution.
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The following are reactants in the chemical reaction shown below.
6CO2 + 6H2O --> C6H12O6 + 6O2
A. CO2 and H2O
B. C6H12O6 and O2
C. H2O and O2
D. CO2 and C6H12O6
Answer:
A
Explanation:
Reactants are on the right side of the chemical reaction
Help Me plz I'm so tired
True or False: all animals that undergo metamorphosis create cocoons The right answer will get $167
Answer:
False
Explanation:
Frogs dont and i looked it up :)
Answer:
False
Explanation
Frog do not.
A student weighs 0.347 g of KHP on a laboratory balance. The KHP was titrated with NaOH and the concentration of the NaOH determined to be 0.110 M. For the second titration, the student correctly diluted 6 M HCl from the reagent shelf using a graduated cylinder to obtain approximately 0.6 M HCl. This solution was titrated with the original NaOH solution. The student calculated the concentration of NaOH from the experiment to be 0.099 M. In which experiment should the student be more confident of the concentration of the NaOH solution
Answer:
Following are the solution to the given question:
Explanation:
Each method through KHP is somewhat more precise since we have weighed that requisite quantity, we exactly know the KHP intensity appropriately. Its initial 6 M HCl concentration was never considered mandatory. They have probably prepared 6 M HCl solution although long ago and could have changed its concentration over even a period.
Each of the given molecules contains a chirality center. Determine the relationship between the molecules. three images of 1-phenyl-1-propanol are given as compound A, B and C. Compound A has a dashed bond to the alcohol group, with the phenyl group on the left side and the remaining carbon chain on the right. Compound B has a dashed bond to the alcohol group, with the phenyl group on the right side and the remaining carbon chain on the left. Compound C has a wedge bond to the alcohol group, with the phenyl group on the right side and the remaining carbon chain on the left. Compound D is 1-phenyl-2-propanol with a dashed bond to the alcohol group and the phenyl on the left side and the remaining single carbon on the right side. What is the relationship between A and B
Answer:
They are enantiomers
Explanation:
So, according and based on the question, you want to know he relation only between A and B. I'll show you in the following drawing. If you want to know the relation with the others, post them on another question thread.
According to what you are stating here, we have a phenyl group on one side, then, the alcohol on one carbon, dashed (a side chain in the phenyl) and the rest of the chain on the same side. This will be compound A.
Compound B is the same as before, but the phenyl group on the other side. Like if you put Compound A in front of a mirror.
The key to know the relationship, is to see the chiral center. If the chiral center has the same configuration (R or S) as the other compound, then, both compounds could be the same molecule. If the configuration is different, then, we might facing enantiomers.
Let'´s see the original 1-phenyl-1-propanol, and formed compound A and B. (See picture below).
According to the picture, we can see that both compound has a different configuration in the chiral center (R and then S), and the only different between them is the fact that the phenyl group is on the other side. This is just like a mirror, so we can conclude that A and B are enantiomers.
Hope this helps
10 ml of a 0.25M solution is diluted to make exactly 250 ml of solution. What's the concentration of the diluted solution?
Answer:
0.01 M
Explanation:
As this problem deals with a dilution process, we can solve it by using the following formula:
C₁V₁=C₂V₂Where subscript 1 stands for the initial concentration and volume, while 2 stands for the final conditions.
That means that in this case:
C₁ = 0.25 MV₁ = 10 mLC₂ = ?V₂ = 250 mLWe input the given data:
0.25 M * 10 mL = C₂ * 250 mLC₂ = 0.01 Mwhat is Keq for the reaction N2+3H2 = 2NH3 if the equilibrium concentrations are NH3 = 2 M, and H2 = 1 M
Answer:
0.5
Explanation:
What is Keq for the reaction N2 + 3H2 = 2NH3 if the equilibrium concentrations are [NH3] = 2 M, [N2] = 1 M, and [H2] = 2 M?
Step 1: Given data
Equilibrium concentrations:
[N₂] = 1 M
[H₂] = 2 M
[NH₃] = 2 M
Step 2: Write the balanced equation
N₂(g) + 3 H₂(g) ⇄ 2 NH₃(g)
Step 3: Calculate the concentration equilibrium constant (Keq)
The concentration equilibrium constant is equal to the product of the concentrations of the products raised to their stoichiometric coefficients divided by the product of the concentrations of the reactants raised to their stoichiometric coefficients.
Keq = [NH₃]² / [N₂] × [H₂]³
Keq = 2² / 1 × 2³ = 0.5
A __ is a solid that forms in a liquid when a chemical reaction takes place.
Answer:
A precipitate is a solid that forms in a liquid when a chemical reaction takes place.
If an atom has more protons than an electron, its net charge will be
Answer: If an object has more protons than electrons, then the net charge on the object is positive. If there are more electrons than protons, then the net charge on the object is negative. If there are equal numbers of protons and electrons, then the object is electrically neutral.
Explanation:
Answer:
The net charge will be Positive
Explanation:
How many sulphur atoms are there in 0.125 moles of sulphur
Explanation:
There are 6.022x1023 molecules in 1 mole of SO3 (Avogadro's number) so in 0.25 moles, there are (0.25)(6.022x1023) molecules in the 0.25 moles of SO3. or 1.506x1023 molecules per 0.25 moles of SO3.
There is one atom of sulfur in each molecule of SO3. So there are 1.506x1023 atoms of sulfur in 0.25 moles of SO3.
According to the concept of Avogadro's number there are 0.7525 ×10²³ atoms of sulfur in 0.125 moles of sulfur.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number
In the given example, number of atoms of sulfur are calculated as, Avogadro's number×number of moles, that is,6.022×10²³ ×0.125=0.75275×10²³ atoms
Therefore, there are 0.75275×10²³ atoms in 0.125 moles of sulfur.
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Write 6.3 x 10^2 in standard form.
O 0.063
O 630
O 63
O 63
Answer:
it will be 630
Explanation:
what is the heat required to heat in 50 g sample of ice from -65 degrees Celsius to -40 degrees Celsius
Answer:
[tex]Q=2562.5J[/tex]
Explanation:
Hello there!
In this case, for this general calorimetry problem, it turns out possible for us to calculate the required heat by using the general heat equation in terms of the mass, specific heat and temperature change:
[tex]Q=mC(T_f-T_i)[/tex]
Thus, by plugging in the mass, the initial and final temperatures and the specific heat of ice, 2.05 in SI units, we obtain:
[tex]Q=50g*2.05\frac{J}{g\°C} (-40\°C+65\°C)\\\\Q=2562.5J[/tex]
Regards!
In calorimetry, energy is measured through heat transfer from one substance to
another. Which of the following is NOT a method of heat transfer?
Answer:
Refraction
Explanation:
4. Nitinol alloy is a valuable industrial material mainly because of its (check
all that apply)
A. elasticity
B. color
C. strength
D. brittleness
Answer:
strength is the correct answer
There is a certain chemical logic to the steps of the citric acid cycle. One particular functional group plays a large role in facilitating most of the chemistry that goes on in the reactions. This group is electron withdrawing, which helps to stabilize carbanion intermediates and increase the reactivity of the methyl group of acetyl CoA. What is this functional group
Answer:
Carbonyl Groups
Explanation:
Electron-withdrawing substituents stabilize the carbon atoms in its surrounding. These chemical groups are Carbonyl groups which withdraw electrons because of the inductive effect and presence of double bond between C and O and also because of the polarity of the two atoms (Carbon and oxygen)
A sample of carbon monoxide at 57 degrees Celsius and under 0.75 atm occupies 85.3 liters of space. What mass of carbon monoxide is present in the sample?
4. The device shown is a
that's used to measure the heat transferred by a reaction under constant volume.
A. bomb calorimeter
B. reaction vessel
C. thermometer
D. coffee-cup calorimeter
Answer:
The device shown is a calorimeter that used to measure the heat transfer by a reaction under constant volume.
Explanation:
Use the drop-down menus to answer the questions about fronts and weather maps.
Cold fronts appear on weather maps in areas of .
Warm fronts appear on weather maps in areas of .
Answer:
Large temperature and air pressure decrease.
Temperature and air pressure increase.
Explanation:
The correct options about fonts and weather maps are:
Cold fronts appear on weather maps in areas of Large temperature and air pressure decrease.
Warm fronts appear on weather maps in areas of Temperature and air pressure increase.
What is a cold front and warm front?Similar to a cold front, there is usually a noticeable temperature change from one side of the warm front to the other.
A cold front occurs when colder air replaces warmer air, while a warm front occurs when warmer air replaces cold air.
Thus, the correct options are:
Cold fronts appear on weather maps in areas of Large temperature and air pressure decrease.
Warm fronts appear on weather maps in areas of Temperature and air pressure increase.
Learn more about warm front
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How do protons, neutrons, and electrons differ in charge?
Answer: Protons have a positive charge. Electrons have a negative charge. The charge on the proton and electron are exactly the same size but opposite. Neutrons have no charge.
Explanation:
A simple way to look at kinetic energy is
A. Violent motion
B. The energy involved when you sit down
C. The energy when you move
D. The energy in a candy bar
E. The high energy, not known to be essential
Answer:
c I do believe good luck with the answer
If the pH of a solution is 6.96, then the solution is a
Answer:
acid
Explanation:
solution with pH less than 7 is acid
those with more that 7 is base
those equal to 7 is neutral
Purification of copper can be achieved by electrorefining copper from an impure copper anode onto a pure copper cathode in an electrolytic cell. How many hours will it take to plate 19.5 kg of copper onto the cathode if the current passed through the cell is held constant at 38.5 A
Answer: It will take 425 hours to plate 19.5 kg of copper onto the cathode if the current passed through the cell is held constant at 38.5 A.
Explanation:
The half-reaction equation is as follows.
[tex]Cu^{2+} + 2e^{-} \rightarrow Cu[/tex]
According to the standard values, 1 mole of an electron carries 96500 C. Therefore, charge carried by 2 moles of electrons is [tex]2 \times 96500 C[/tex].
Also, atomic mass of Cu is 63.5 g. According to the equation 2 moles of electrons are depositing 63.5 g of Cu.
Hence, charge required to deposit 19.5 kg (1 kg = 1000 g) or 19500 g of Cu is calculated as follows.
[tex]19500 g Cu \times \frac{2 \times 96500 C}{63.5 g Cu}\\= 5.92 \times 10^{7} C[/tex]
Formula used to calculate time is as follows.
[tex]Q = I \times t[/tex]
where,
Q = charge
I = current
t = time
Substitute the values into above formula as follows.
[tex]5.92 \times 10^{7} C = 38.5 \times t\\t = \frac{5.92 \times 10^{7} C}{38.5}\\= 1.53 \times 10^{6} sec[/tex]
As 1 hour contains 3600 seconds. So, converting seconds into hours as follows.
[tex]1.53 \times 10^{6} sec = 1.53 \times 10^{6} sec \times \frac{1 hr}{3600 sec}\\= 425 hr[/tex]
Thus, we can conclude that it will take 425 hours to plate 19.5 kg of copper onto the cathode if the current passed through the cell is held constant at 38.5 A.
What does the cell theory state? Answer F All organisms are composed of a nucleus G All prokaryotes are composed of multiple cells H All prokaryotes are single celled organisms J All organisms are composed of cells
Answer:
(J) All organisms are composed of cells
Under the right conditions aluminum will react with chlorine to produce aluminum chloride.
2 Al + 3Cl2 -> 2 AlCl3
How many grams of aluminum chloride can be produced when 157.0g of aluminum react with excess chlorine?
Answer:775.9 g AlCl3
but what the steps pls help
Answer:
775.9 g
Explanation:
Step 1: Write the balanced equation
2 Al + 3 Cl₂ ⇒ 2 AlCl₃
Step 2: Calculate the mass corresponding to 157.0 g of Al
The molar mass of Al is 26.98 g/mol.
157.0 g × 1 mol/26.98 g = 5.819 mol
Step 3: Calculate the moles of AlCl₃ produced from 5.819 moles of Al
The molar ratio of Al to AlCl₃ is 2:2. The moles of AlCl₃ produced are 2/2 × 5.819 mol = 5.819 mol.
Step 4: Calculate the mass corresponding to 5.819 moles of AlCl₃
The molar mass of AlCl₃ is 133.34 g/mol.
5.819 mol × 133.34 g = 775.9 g
What is the job of an environmental engineer?
Answer:
To keep the evinermental machinces working
Explanation:
When electrons move to a shell closer to the nucleus, energy is released as
Answer:
it is released as lower energy
lower energy will be the answer
hope it helps!!!!!
UV light can damage biological molecules because it has sufficient energy to break bonds within molecules. A carbon-carbon single bond typically requires 348 kJ/mol of energy to break it. What is the longest wavelength of light with energy sufficient to break this bond
Answer:
5.72 × 10⁻³¹ m
Explanation:
Step 1: Given and required data
Energy to break 1 mole of C-C single bonds (E): 348 kJPlanck's constant (h): 6.63 × 10⁻³⁴ J.sSpeed of light (c): 3.00 × 10⁸ m/sStep 2: Calculate the longest wavelength of light (λ) with energy sufficient to break this bond
We will use the Planck-Einstein relation.
E = h × c/λ
λ = h × c/E
λ = (6.63 × 10⁻³⁴ J.s) × (3.00 × 10⁸ m/s)/(348 × 10³ J) = 5.72 × 10⁻³¹ m
A student determines that the theoretical yield of CaCO3, from a precipitation reaction is 21.5 grams
However, this student only recovers 19.9 grams of precipitate through filtration of the solution.
What would be this student's percent yield?
A. 92.6%
B. 0.93%
C. 108%
D. 85.6%
Answer:
92.6
Explanation:
Give the ratio that balances out the following equation: ___Cr + ___Pb(NO3)4 ---> ___ Cr(NO3)3 + ____ Pb
the doge has the answer
Pb(NO3)4
