how many moles are in 3.01 x 10^22
Answer:
The answer is "5 moles".
Explanation:
Please find the complete question in the attached file.
[tex]\to 3.01 \times (10^{22}) = 0.0499822251 \approx 0.05 \ moles[/tex]
Which property is better explained by the band theory than by the sea-of-electrons model?
Calculate the pH of each of the following solutions. (a) 0.12 M KNO2 WebAssign will check your answer for the correct number of significant figures. (b) 0.37 M NaOCl WebAssign will check your answer for the correct number of significant figures. (c) 0.39 M NH4ClO4 WebAssign will check your answer for the correct number of significant figures.
Answer:
a. pH → 8.12
b. pH → 10.55
c. pH → 8.38
Explanation:
In this excersise, the first two salts come from a strong base and a weak acid, so the anion will make hydrolisis that can help us, to determine pH.
The NH₄ClO₄ comes from a weak acid and a weak base. This is an special case.
a. KNO₂ → K⁻ + NO₂⁻
NO₂⁻ + H₂O ⇄ HNO₃ + OH⁻ Kb = 1.41×10⁻¹¹
Kb = x² / (0.12 - x)
We can avoid the x in denominator because Kb it is a very low value. This expression is reduced to:
[OH⁻] = √(Kb . 0.12)
[OH⁻] = √(1.41×10⁻¹¹ . 0.12) = 1.30×10⁻⁶ M
- log [OH⁻] = pOH → - log 1.30×10⁻⁶ = 5.88
14 - pOH = pH → 14 - 5.88 = 8.12
b. NaOCl → Na⁻ + OCl⁻
OCl⁻ + H₂O ⇄ HClO + OH⁻ Kb = 3.33×10⁻⁷
The same as before, we avoid the x in denominator because Kb it is a very low value.
[OH⁻] = √(Kb . 0.37)
[OH⁻] = √(3.33×10⁻⁷ . 0.37)
[OH⁻] = 3.51×10⁻⁴ M
- log 3.51×10⁻⁴ = 3.45 → pOH
14 - 3.45 = 10.55 → pH
c. NH₄ClO₄ → NH₄⁺ + ClO⁴⁻
Both ions can make hydrolisis in water. Ammonium can give ammonia and the hypochlorite makes hypochlorous acid.
NH₄⁺ + H₂O ⇄ NH₃ + H₃O⁺ Ka = 5.7×10⁻¹⁰
OCl⁻ + H₂O ⇄ HClO + OH⁻ Kb = 3.33×10⁻⁷
The reduced expression to calculate pH for this sort of salts, is to make the square root of the product between the Ka constant.
As we have Kb for the HClO, we need to determine the Ka
Kw = Ka . Kb → Kw/Kb = Ka → 1×10⁻¹⁴ / 3.33×10⁻⁷ = 3×10⁻⁸
[H₃O⁺] = √(5.7×10⁻¹⁰ . 3×10⁻⁸) = 4.14×10⁻⁹ M
- log [H₃O⁺] = pH → - log 4.14×10⁻⁹ = 8.38
As per the calculations of the pH the solutions of 0.12 M KNO2 and 0.37 M NaOCl and the 0.39 M NH4ClO4 web assign have been made with a significant check on the figures.
Thus the answer for the first is pH → 8.12 and that of second calculation is pH → 10.55 and the last id pH → 8.38.Learn more about the Calculate the pH of each of the following solutions.
brainly.com/question/9465562.
Can someone please help I don’t now which one to put
Answer:
2nd or 3rd dyfudhfkfhxhxhxjxjcjcifid
A gas occupies 10.2 liters at 0.60 atm. What is the pressure if the volume becomes 3.0 L?
Calculate the molecular weight of 0.2g H3X solution if 50ml of this acid neutralized with 40ml of 0.03N Ca(oH)2 then calculate strength of this solution in ppm
Answer:
1. Molecular weight = 333.3 g/mol
2. Strenght = 2222.2 mg/L
Explanation:
First, we need to find molarity (M) from normality (N) as follows:
[tex] N = nM [/tex]
Where n is the number of OH⁻ = 2
[tex] M = \frac{N}{2} = \frac{0.03}{2} = 0.015 mol/L [/tex]
Now, when the H₃X solution is neutralized with Ca(OH)₂ we have:
[tex]\eta_{H_{3}X} = \eta_{Ca(OH)_{2}} = M_{Ca(OH)_{2}}*V_{Ca(OH)_{2}} = 0.015*0.04 = 6 \cdot 10^{-4} moles[/tex]
Hence, the molecular weight (MW) of H₃X is:
[tex] MW = \frac{m_{H_{3}X}}{\eta_{H_{3}X}} = \frac{0.2 g}{6 \cdot 10^{-4} moles} = 333.3 g/mol [/tex]
Finally, we can calculate the strength (S) of this solution in ppm as follows:
[tex] S = \frac{m}{V} = \frac{200 mg}{0.050 L + 0.040 L} = 2222.2 mg/L [/tex]
I hope it helps you!
Which statement is true about energy? A. Energy never moves. B. Energy is never destroyed. C. Energy always changes to heat. D. Energy always changes to light.
Answer: energy is never moves
Explanation:
how many moles react with 11 moles of oxygen
PLEASE HELP ASAP
What chemical combines with nitrogen dioxide to form nitric acid?
Opg
H
OH
02
03
Answer:
opg
Explanation:
A series of chemical reactions transform Volatile Organic Compounds (VOCs) into substances that combine with nitrogen dioxide to produce PAN (Peroxyacytyl nitrate), yet another element in smog. Nitrogen dioxide in the air also reacts with water vapor to form nitric acid, one of the types of acid in acid rain.
where are chemicals found?
A.) only in liquids
B.) only in air
C.) in solids,liquids, and gases
D.) only in powders
Answer: c
Explanation: pretty sure its c :]
How have animals developed physiological adaptations to survive in colder climates?
what is the pH of a 0.020 M RboH solution?
can someone help me with this plz??
Answer:
I dont know at all and that is confusing.
A synthesis reaction takes place when carbon monoxide (CO) and hydrogen gas (H2) react to form methanol (CH3OH). How many grams of methanol are produced when 2.8 grams of carbon monoxide reacts with 0.50 grams of hydrogen gas?
3.2 grams
3.6 grams
4.0 grams
6.0 grams
Answer: 3.2 grams
Explanation:
took the quiz
The methanol are produced when 2.8 grams of carbon monoxide reacts with 0.50 grams of hydrogen gas is 3.6 grams. option B is correct.
What is methanol?Methanol is also known as methyl alcohol or wood spirit, it is the long series of organic compounds called alcohols, having a methyl group (CH 3) attached with a hydroxy group (OH). Methanol was formerly made by the process of destructive distillation of wood.
Here, 2.8 grams of carbon monoxide reacts with 0.50 grams of hydrogen gas as there are 4 hydrogen molecules add 2.8 + 0.50 × 2 = 3.6 grams.
Therefore, methanol are produced when 2.8 grams of carbon monoxide reacts with 0.50 grams of hydrogen gas is 3.6 grams. option B is correct.
Learn more about methanol, here:
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Lions and cheetahs prey on wildebeests that graze in the grasslands of the african savanna what likely effect would increased rainfall over several rainy seasons have on the populations of wildebeests lions and cheetahs?
Answer:
All three populations would increase.
Explanation:
A leader from Louisiana is claiming that it is necessary to include the effects of tornadoes in his city’s emergency plan for natural disasters. Use data from Map 1, the graphs, and what you know about tornadoes to support his claim.
please answer this now i will give brainliest to first person who got it correct.
and don't answer it if you just gonna write stuff that weren't don't even make since to get the point.
Answer:
i dont know either im sorry
Explanation:
Answer:
Where are the graphs?
Explanation:
container has a volume of 28 L and a temperature of 45 ºC The volume is increased to 34 L. What is the new temperature of the gas
Answer:
386.14 K ( 113.14 ºC)
Explanation:
Initial Volume V1 = 28 L
Initial Temperature T1 = 45 + 273 = 318 K
Final Temperature T2 = ?
Final Volume V2 = 34 L
The relationship between these quantities is given by the charles law equation;
V1 / T1 = V2/ T2
T2 = V2 * T1 / V1
Inserting the values
T2 = 34 * 318 / 28
T2 = 386.14 K
Which radioisotope requires long-term storage as the method of disposal, to protect living things from radiation exposure over time?
Pu-239
FR-229
Fe-53
P-32
Answer:pu-239
Explanation:
Pu-239 is regarded as the radioisotope requires long-term storage as the method of disposal, to protect living things from radiation exposure over time
Disposal of radioactive nuclear waste is often regarded as a problem.
The waste sources are:
Nuclear power reactors Bomb-related nuclear materialDisposal of bomb-grade plutonium is often difficult.
The longer lived isotopes are:
Plutonium-239 whose t1/2 is 24,110 years, Plutonium-240 whose t1/2 is 6,540 years, Curium-245 whose t1/2 is 8,500 years. etc.The storage of the longer lived elements is through containment for the next several thousand of years.
The control or management of radioactive waste is a hard, multifaceted procedure.
Learn more from
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A molecule, Z, contains two atoms of oxygen, six atoms of hydrogen and three atoms of carbon. What is the formula of Z?
Answer:
C3H6O3
Explanation:
Hydroxyacetone
0.074 liters of a 15 M solution need to be diluted so that the new
concentration is 3.40 molar. What should the new volume of the solution
be?
A) 0.17 liters
B) 0.33 liters
C) 2.3 liters
D) 3.2 liters
Answer:
3.2
Explanation:
i caculated give me a 1 star if incorrect
How many atoms are present in 3.500 mol of NH3? NEED ANSWER ASAP
Solid calcium carbonate breaks down into carbon dioxide gas, oxygen gas, and solid calcium, write an equation for described reactions chemistry
Answer:
CaCO₃ ------> CaO + CO₂
Note: The breakdown products of solid calcium carbonate is not carbon dioxide gas, oxygen gas, and solid calcium. Rather, it is calcium oxide and carbon dioxide as shown in the reaction equation above.
Explanation:
Calcium carbonate is a mineral which occurs in nature in rocks as calcite and limestone. It is also the main component of eggshells, snail shells, seashells and pearls. It has the molecular formula CaCO₃.
Calcium carbonate or limestone decomposes into calcium oxide and carbon dioxide when heated and the reaction is used to make quicklime and carbon dioxide gas. The equation of the reaction is given below:
CaCO₃ ------> CaO + CO₂
Calcium oxide, one of the products of The decomposition reaction is known as lime and is an important mineral used for many purposes such as reducing the acidity of soils, in the production of limelight, as well as serving as the main ingredient in cement.
The main use of calcium carbonate is in the construction industry as an ingredient of cement. Calcium carbonate is also an important mineral required by sea organisms for making their shells.
An unknown solid has a specific heat capacity of 0.727 J/gC. If a 12.3 grams sample is heated and increases in temperature from 22.4C to 62.1C, calculate how much heat was absorbed? You must show your work.
I'm a little lost
Answer:
355Joules
Explanation:
The amount of heat absorbed can be calculated using the formula:
Q = m × c × ∆T
Where;
Q = amount of heat absorbed in joules
m = mass of substance in grams
c = specific heat capacity of solid (0.727 J/g°C)
∆T = final temperature - initial temperature (°C)
According to the information provided in this question;
Q = ?
m = 12.3g
∆T = 62.1°C - 22.4°C = 39.7°C
c = 0.727 J/g°C
Using Q = m × c × ∆T
Q = 12.3 × 0.727 × 39.7
Q = 355.001
Q = 355Joules
Hence, 355J of heat was absorbed
A forest has both light colored trees and dark colored trees this same forest had both light colored months and dark colored months one year there is a disease that moves through the forest killing many of the light colored trees when the light colored trees were killed by a disease the forest became almost entirely composed of dark - colored trees generations later almost all months in the forest were dark in color instead of light which of the following gives the most likely explanation for why almost all the months were dark in color.
The dark moths were better hidden from predators and therefore more of them survived and this allowed them to have offspring.
Answer:
The dark moths were better hidden from predators and therefore more of them survived and this allowed them to have offspring.
Explanation:
If all of the light colored trees disappeared and there are only dark colored ones, then that means that the light colored moths wouldn't be able to live long since their traits wouldn't match the environment. This then leads to the conclusion that dark moths would be better hidden since their trait fits their current environment and would let them be hid much better from predators. This would allow them to survive longer and eventually, reproduce.
Which daily task involves a mix of simple and complex technology?
What is the difference between a physical and chemical change? (Use words reactants, products, atoms and molecules.)
Answer:
A physical change, such as a state change or dissolving, does not create a new substance, but a chemical change does. In a chemical reaction, the atoms and molecules that interact with each other are called reactants. In a chemical reaction, the atoms and molecules produced by the reaction are called products.
if you are curious at to why so many of ur family members have certain hair or eye color, you might want to look at... A. Astrology... B. A family tree... C. Heredity... D.Geometry
Answer:
c) hereditary
Explanation:
This means that if your parents had one eye colour, you'll most likely have the same one because you share the same genes, and it's passed down to you.
Marcus wants to use two objects to compare the sizes of a proton and an electron. If he uses a basketball for a proton, which object would best represent an electron?
A
a pea
B
a bowling ball
C
a soccer ball
D
a beach ball
Answer:
A
Explanation:
does all Newton's laws work together
Which of the following is not a unit of volume?
А. L
B. mL
C.m3
D. cm2