Answer:
0.03 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
We have
[tex]n = \frac{1.8 \times {10}^{22} }{6.02 \times {10}^{23} } \\ = 0.02990...[/tex]
We have the final answer as
0.03 molesHope this helps you
What is the number of moles of K+ ions are present in 250 mL of a 0.4M KCl solution?
a. 0.1 mol c. 0.62 mol
b. 0.16 mol d. 1.6 mol
The concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution. Therefore, 0.025 is the number of moles of K+ ions are present in 250 mL of a 0.4M KCl solution.
What is molarity?Molarity can be calculated by dividing number of moles of solute by volume of solution in litre. Molarity is affected by temperature. Its unit is mole/liter. It measure the concentration of any solute in a solution.
Mathematically,
Molarity= number of moles of solute/volume of solution in litre
Substituting values in equation 1
0.4M=number of moles of solute/0.25
number of moles of solute=0.025moles
Therefore, 0.025 is the number of moles of K+ ions are present in 250 mL of a 0.4M KCl solution.
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How many oxygen atoms are in 1.00 kg of carbon dioxide?
Answer: I believe its two
Explanation:
Consider an electrochemical decomposition apparatus comprised of a strontium chloride cell, a berylium chloride cell, and a barium chloride cell (you should be able deduce the formulae for these compounds). If sufficient charge is passed through the circuit to produce 20 g of strontium in the molten strontium chloride cell, what quantity of berylium is expected in the berylium chloride cell
Answer:
Explanation:
Atomic weight of strontium ( Sr ) is 88 .
Atomic weight of Beryllium ( Be) is 9 .
Both are bivalent .
2 x 96500 coulomb is required to decompose 88 g of Sr .
88 g of Sr requires 2 x 96500 coulomb of charge
20 g of Sr will require 2 x 96500 x 20 / 88 coulomb of charge
coulomb of charge required = 43863.63 coulomb .
9 g of Be requires 2 x 96500 coulomb of charge
2 x 96500 coulomb of charge gives 9 g of Be
43863.63 coulomb .of charge gives 9 x 43863.63 / (2 x 96500 ) g of Be
= 2.04 g.
list five examples of acidic oxides
8 acidic oxides, take your pick <3
Aluminium oxide.
Silicon dioxide.
Phosphorus oxides.
Sulfur oxides.
Chlorine oxides.
Iron oxides.
Chromium oxides.
Vanadium oxides
explaining how is it day time in the UAE and night time in the USA
Because of their different longitude.
Using ethylene (HC-CHz) as your only source of carbon atoms, outline a synthesis for 3- hexanone,
The organic compound 3-hexanone can be prepared from ethylene using the second method given in the options.
What is 3-hexanone?3-hexanone is an organic compound classified to the ketones. Ketones are compounds with C=O group. 3-hexnone has the carbonyl group in the third carbon in the chain.
3- hexanone can be synthesized alkene sources by first converting them to alkynes. This process is oxidation. Ethylene can be oxidized to ethyne by treating with HBr and NaNH2 followed by hydrolysis.
The obtained higher alkyne or hexyne undergone acid hydrolysis in presence of sulphuric acid giving 3-hexanone.
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What is the empirical formula for the compound H4O2?
Answer:
Explanation:
Dear student, there is no sufficient information to calculate the empirical formula but we will explain what Empirical Formula is all about.
An empirical formula is made up of symbols that denote the elements in a complex, such as H for hydrogen and O for oxygen, as well as subscripts that indicate the number of atoms from each constituent element.
The empirical formula is the atoms in a complex with the lowest whole number ratio. The precise number of atoms in a single molecule is not necessarily shown.
4. How many molecules are in the following formula?
3Fe2O3
Answer:
Option C, 3 molecule is correct
Explanation:
The formula is of Ferric oxide
3Fe2O3
The number 3 ahead the chemical formula represents the number of molecules of the given substance. In general the formula of iron (III) oxide is Fe2O3
Since there are three molecules of it hence the formula is written as 3Fe2O3
Option C, 3 molecule is correct
Describe why chemists needed to invent a new counting unit.
Answer:
Why do chemists use the mole as a counting unit? Because chemical reactions often involve large numbers of small particles, chemists use a counting unit called the mole to measure amounts of a substance. ... The discovery enabled scientists to classify certain chemical reactions as transfers of electrons between atoms.Explanation:
Chemical reactions often involve large numbers of small particles, chemists use a counting unit called the mole to measure amounts of a substance.
Why is counting so important?It is not possible to vell with a single atom or molecule because we
can't count them.
Chemists have set a number of particles with which to toil that is convenient. As molecules are very small.
Thus, chemists use a counting unit called the mole to measure the amounts of a substance.
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The volume of a gas at 2.0 atm is 3.0 L. What is the volume of the gas at 1.5 atm at the same temperature?
0.50 L
1.0 L
1.5 L
4.0 L
By applying Boyle's law, the new volume of this gas is equal to: D. 4.0 L.
Given the following data:
Initial volume = 3.0 L.
New pressure = 1.5 atm.
Initial pressure = 2.0 atm.
How to calculate the new volume?In order to calculate the new volume of this gas, we would apply Boyle's law. Mathematically, Boyle's law is given by this formula:
PV = k
P₁V₁ = P₂V₂
Where:
P represents the pressure.V represents the volume.Making V₂ the subject of formula, we have:
V₂ = (P₁V₁)/P₂
Substituting the given parameters into the formula, we have;
V₂ = (2.0 × 3.0)/1.5
V₂ = 6.0/1.5
V₂ = 4.0 L.
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Answer:
D. 4.0 Liters
Explanation:
I took the exam
Who would require more Calories to maintain their weight, and why? Person A: 6
feet tall, 190 lbs, exercises for 30 minutes every day. Person B: 5 feet 6 inches tall,
150 lbs, exercises 10 minutes every day. *
Which process transfers heat from a hot pavement to a person sitting on
Answer: The answer is Conduction
Answer:
Conduction
Explanation:
Conduction happens when materials or objects are in direct contact with each other. The molecules in the warmer object vibrate faster than the ones in the cooler object.
How many molecules of H2O are equivalent to 97.2g H2O
Answer:
3.25×10²⁴ molecules
Explanation:
From the question given above, the following data were obtained:
Mass of H₂O = 97.2 g
Number of molecule of H₂O =?
From Avogadro's hypothesis, we understood that:
1 mole of H₂O = 6.02×10²³ molecules
Next, we shall determine the mass of 1 mole of H₂O. This can be obtained as follow:
1 mole of H₂O = (2×1) + 16
= 2 + 16
= 18 g
Thus,
18 g of H₂O = 6.02×10²³ molecules
Finally, we shall determine the number of molecules in 97.2 g of H₂O. This can be obtained as follow:
18 g of H₂O = 6.02×10²³ molecules
Therefore,
97.2 g of H₂O = 97.2 × 6.02×10²³ / 18
97.2 g of H₂O = 3.25×10²⁴ molecules
Thus, 97.2 g of H₂O contains 3.25×10²⁴ molecules.
You are marooned on a sandy island surrounded by ocean water. A stagnant, murky, looking pond contains the only available water on the island. In your survival kit, you have the following items:
-One nylon jacket
-One plastic cup
-Two plastic bags
-One length of rubber tubing
-One knife
-One 1-L bottle of liquid bleach
-One 5-L glass bottle
-One bag of salted peanuts
Describe a plan to produce drinkable water using only the items available and the sun. Use pictures as necessary.
Answer:
Step 1: Use the kn*fe to cut the rubber tubing into two pieces.
Step 2: Use one plastic bag to filter the pond's murky water. Place the bag over the plastic cup and pour the water into it.
Step 3: Place the filtered water from the plastic bag into the 5-L glass bottle.
Step 4: Add a few drops of the liquid bleach to the water in the glass bottle.
Step 5: Place the nylon jacket over the top of the glass bottle and secure it with the rubber tubing.
Step 6: Place the glass bottle in direct sunlight and let it sit for at least an hour.
Step 7: Remove the nylon jacket and rubber tubing from the glass bottle.
Step 8: Use the second plastic bag to filter the water from the glass bottle.
Step 9: Enjoy the drinkable water!
Explanation:
A standard galvanic cell is constructed in which a Ni2+ | Ni half cell acts as the cathode. Which of the following statements are correct? (choose all that apply)
1. As the cell runs, anions will migrate from the Ni2+|Ni compartment to the other compartment.
2. The anode reaction could be Cr -> Cr3+ + 3e-
3. Ni2+ is reduced at the cathode.
4. The anode compartment could be I2|I-.
5. Ni is oxidized at the cathode.
Answer:
Ni2+ is reduced at the cathode.
The anode reaction could be Cr -> Cr3+ + 3e-
As the cell runs, anions will migrate from the Ni2+|Ni compartment to the other compartment.
Explanation:
As we know, in a galvanic cell, oxidation occurs at the anode and reduction occurs at the cathode. Hence at the cathode, nickel is reduced as follows;
Ni^2+(aq) + 2e ----> Ni(s)
Considering the reduction potential of the Ni2+ | Ni half cell (-0.25 V) and that of the Cr3+/Cr half cell (-0.74 V), the later has a more negative reduction potential and will most likely serve as the anode of the galvanic cell.
Lastly, the reduction of Ni^2+ leads to a build up of anions in the cathode compartment. To maintain neutrality in the cell, some anions migrate to the other compartment.
How many atoms are in a sample of chromium with a mass of 31 grams? O a 2.4 x 1024 atoms of chromium b 3.6 x 1023 atoms of chromium 1.9 x 1026 atoms of chromium Od 1.5 x 1023 atoms of Chromium
Answer:
b. 3.66x10²³ atoms of chromium.
Explanation:
First we calculate how many moles are there in 31 grams of chromium, using its molar mass:
Molar Mass of Chromium = 51 g/mol (This can be found on any periodic table)31 g ÷ 51 g/mol = 0.608 molThen we calculate how many atoms are there in 0.608 moles, using Avogadro's number:
0.608 mol * 6.023x10²³ atoms/mol = 3.66x10²³ atomsThe correct answer is thus option b. 3.66x10²³ atoms of chromium.
A student is conducting molecular weight determination of an unknown diprotic acid. He first prepared a 250 mL of 0.15 M NaOH (39.997 g/mol) titrant solution, which he then standardized with 0.7625 g of KHP (204.22 g/mol) which consumed 26.32 mL of the titrant. After standardization, he weighed 0.0996 g of unknown diprotic acid and the titration reached the endpoint at a volume of 11.68 mL. What is the standardized concentration of titrant?
Answer:
0.0710
Explanation:
Basedon the data provided, the concentration of the standardized titrant is 0.142 M.
What is a standard solution?A standard solution is a solution of known concentration.
The concentration of the standardized titrant is calculated from the mole of KHP required.
Moles of KHP = 0.7625 g/ 204.22 g/mol
Moles of KHP = 0.00373 mol
Mole ratio of KHP and NaOH is determined from the equation of the reaction below:
NaOH + KHP → KNaP + H2OMole ratio is 1:1Therefore, moles of NaOH = 0.00373 moles
Molarity of a NaOH = moles/volume in L
volume of titrant = 26.32 mL = 0.02632 L
Molarity of NaOH = 0.00373/0.02632
Molarity of NaOH = 0.142 M
Therefore, the concentration of the standardized titrant is 0.142 M.
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why is FCN linear and not bent
Answer:
The key difference between linear and bent molecules is that linear molecules have atoms bonded to each other, forming a straight molecule, whereas bent molecules have atoms arranged in a bend-shape with an angle. The terms linear molecules and bent molecules describe the shapes of different molecules.
Explanation:
bcz of molecules ............
What could be the estimated atomic mass of Silicon?
A. 26.2 amu
B. 28.1 amu
C. 29.8 amu
D. 30.1 amu
Answer:
B. 28.1 amu
Explanation:
Which of the following is a polar substance?
O Water
O Grease
O Gasoline
O Oil
Can the following reaction occur? Why?
Cl2 + Mg 2 - 12 + MgCl2
Answer:
yes
Magnesium (Mg) combines with chlorine (Cl2) to form a new product as magnesium chloride (MgCl2). Therfore its a combination reaction and the balanced equation can be written as: Mg(s)+Cl2(g)→MgCl2(s)
To write a number in scientific notation:
a.)move the decimal place until there is a number between one and ten
b.) Write x 10 to the right of the number
C.)count the number of times the decimal had to move and write this as an exponent
D) if it was a BIG number, it should be positive if it was a small number (less than 1) it should be negative
3.00 x 108 m/s should be written in scientific notation. Medical Notation (numbers less than 1.0) Add a decimal place after the decimal, to the right. To the left of the decimal point, there should only be one number. The brand-new number ranges from 1.0000 to 9.9999.
How to write a number in scientific notation?For the purpose of providing an exact result, certain elements of scientific notation must be included. In scientific notation, all numbers have the format "m x 10n. Important components for determining the scientific notation include the following:
Decimal: You move the decimal a specific number of times to the right or left of the coefficient to discover the scientific notation until it becomes a number equal to or greater than one and less than 10.
Coefficient: To calculate this value, the decimal point must move a predetermined amount of times. An amount that is one or larger and less than ten is referred to as a coefficient.
Base: The base number is always 10. The exponent comes into play when multiplying to arrive at the final solution.
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Which of these is an example of a physical property?
A. Chlorine oxidizes bacterial cells.
B. Chlorine gas is yellow-green in color.
C. Chlorofluorocarbons (CFC's) react with ozone (O₂).
D. Potassium ignites when placed in water.
Answer:
B. Chlorine gas is yellow-green in color.
What is the final temperature of the metal?
What is the temperature change of the water?
What is the temperature change of the metal?
"C
Answer:
1. The final temperature of the metal is 111 °C.
2. The change in the temperature of the water is 6.2 °C
3. The change in the temperature of the metal is 40.6 °C.
Explanation:
From the question given above, the following data were obtained:
Initial temperature of metal (Tₘ₁) = 70.4 °C
Initial temperature of water (Tᵥᵥ₁) = 23.6 °C
Equilibrium temperature (Tₑ) = 29.8 °C
1. Determination of the final temperature of metal.
We'll begin by calculating the change in temperature of the metal. This can be obtained as follow:
Initial temperature of metal (Tₘ₁) = 70.4 °C
Equilibrium temperature (Tₑ) = 29.8 °C
Change in temperature of metal (ΔTₘ) =?
ΔTₘ = Tₘ₁ – Tₑ
ΔTₘ = 70.4 – 29.8
ΔTₘ = 40.6 °C
Finally, we shall determine the final temperature of the metal. This can be obtained as follow:
Initial temperature of metal (Tₘ₁) = 70.4 °C
Change in temperature of water (ΔTₘ) = 40.6 °C
Final temperature of metal (Tₘ₂) =?
40.6 = Tₘ₂ – 70.4
Collect like terms
40.6 + 70.4 = Tₘ₂
111 = Tₘ₂
Tₘ₂ = 111 °C
Thus, the final temperature of the metal is 111 °C
2. Determination of the change in the temperature of the water.
Initial temperature of water (Tᵥᵥ₁) = 23.6 °C
Equilibrium temperature (Tₑ) = 29.8 °C
Change in temperature of water (ΔTᵥᵥ) =?
ΔTᵥᵥ = Tₑ – Tᵥᵥ₁
ΔTᵥᵥ = 29.8 – 23.6
ΔTᵥᵥ = 6.2 °C
Therefore, the change in the temperature of the water is 6.2 °C
3. Determination of the change in the temperature of the metal.
The change in the temperature of the metal is 40.6 °C.
Please solution 1 above for explanation.
Answer:
29.8 C
6.2 C
-40.6 C
:)
Explanation:
Brainliest get's +20 points!
Answer:
i think thats correcr!
Explanation:
3 What does the term electrolysis mean?
?
Answer:
Electrolysis is the passing of a direct electric current through an electrolyte producing chemical reactions at the electrodes and decomposition of the materials. The main components required to achieve electrolysis are an electrolyte, electrodes, and an external power source.
Explanation:
Answer:
In chemistry and manufacturing, electrolysis is a technique that uses direct electric current to drive an otherwise non-spontaneous chemical reaction. Electrolysis is commercially important as a stage in the separation of elements from naturally occurring sources such as ores using an electrolytic cell.
hope it helps uh....
I am new here...
thanks ^^
What is the wavelength of a photon with a frequency of 7.81 1014 Hz?
A.
517 nm
B.
384 nm
C.
848 nm
D.
234 nm
Answer:
Option B. 384 nm
Explanation:
From the question given above, the following data were obtained:
Frequency (f) = 7.81×10¹⁴ Hz
Velocity of photon (v) = 3×10⁸ m/s
Wavelength (λ) =?
The wavelength of the photon can be obtained as follow:
v = λf
3×10⁸ = λ × 7.81×10¹⁴
Divide both side by 7.81×10¹⁴
λ = 3×10⁸ / 7.81×10¹⁴
λ = 3.84×10¯⁷ m
Finally, we shall convert 3.84×10¯⁷ M to nm. This can be obtained as follow:
1×10¯⁹ m = 1 nm
Therefore,
3.84×10¯⁷ m = 3.84×10¯⁷ m × 1 nm / 1×10¯⁹ m
3.84×10¯⁷ m = 384 nm
Thus, the wavelength of the photon is 384 nm
given the following hypothetical reaction 2E(g)+ F(g)+O(g)_products.if the rate law is rate _K(e)^2(f)^-1,what is the order of the reaction with respect to water?
Answer:
See explanation.
Explanation:
Hello there!
In this case, considering the given information, it is not possible to figure out such order of reaction with respect to water as it is not involved in the given chemical reaction:
2E(g)+ F(g)+O(g)_
However, we can say that the order of reaction is 2 with respect to E (power of 2 in the rate law), 1 with respect to F (power of 1 in the rate law) and 0 with respect to O (power of 0 or not present in the rate law).
Regards!
Compared to a human, what is similar about how blue whales get molecules from food and air?
Answer: Blue whales, like humans, obtain molecules from food and air through a process of digestion and respiration. During digestion, molecules in food are broken down and absorbed into the bloodstream, while during respiration, oxygen molecules in the air are absorbed into the bloodstream. Both processes enable blue whales to obtain the necessary molecules for energy, growth, and development.
how do you test the methods of cleaning an oil spill while not risking the lives of the organisms
Answer:
Get a controlled environment, such as a pool or even a bowl. Pour some oil in it then you can test your solutions without causing any damage.
Explanation: