A gas is produced when 25 g of substance X is mixed into 60 g of solution Z in a beaker. The mass of the solution in the beaker after the reaction is 75 g. What is the mass of the gas released?
(X + Z -> gas + solution)
Answers
mass of the gas = 10 g
Further explanationThe law of conservation of mass :
In a closed / isolated system, the total mass of the substance before the reaction will be equal to the total mass of the reaction product.
Reaction
\(\tt X+Z\rightarrow gas+solution\)
mass before reaction=mass after reaction
\(\tt 25+60=gas+75\\\\gas=25+60-75=10~g\)
Related Questions
. Dãy oxide nào sau đây tác dụng được với hydrochloric acid?
Answers
Answer:
ALL
Explanation:
Which equation is NOT balanced?
A. 2H2 + O2® 2H2O
B. H2 + H2 + O2® H2O + H2O
C. 2H2 + O2® H2O
D. 4H2 + 2O2® 4H2O
Answers
Answer:
C
Explanation
On the reactants side there is 4 Hydrogen atoms in total and two oxygen atoms on the left however on the right there is two hydrogen atoms and one oxygen atom. Leaving this equation unbalanced
The equation that is NOT balanced is \(\rm 2H_2 + O_2\rightarrow H_2O\). The correct answer is option C.
In a balanced chemical equation, the number of atoms of each element on the reactant side must be equal to the number of atoms of each element on the product side.
In equation A, there are 4 hydrogen atoms and 2 oxygen atoms on both the reactant and product sides, so it is balanced.In equation B, there are 4 hydrogen atoms and 2 oxygen atoms on both the reactant and product sides, so it is balanced.In equation C, there are 4 hydrogen atoms and 2 oxygen atoms on the reactant side, but only 2 hydrogen atoms and 1 oxygen atoms on the product side. Therefore, it is not balanced.In equation D, there are 8 hydrogen atoms and 4 oxygen atoms on both the reactant and product sides, so it is balanced.In conclusion, equation C. \(\rm 2H_2 + O_2\rightarrow H_2O\) is the one that is NOT balanced. It has an unequal number of oxygen atoms on the reactant and product sides.
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which of the following molecules will not participate in dipole-dipole interactions?select the correct answer below:so2h2oh2sco2
Answers
The correct answer is CO2. CO2 is a linear molecule with two identical oxygen atoms bonded to a central carbon atom.
The electronegativity difference between the carbon and oxygen atoms is zero, meaning that the bond dipoles cancel each other out, resulting in a nonpolar molecule. Since dipole-dipole interactions occur between polar molecules, CO2 will not participate in dipole-dipole interactions.
On the other hand, SO2, H2O, and H2S are polar molecules with a net dipole moment, which allows them to participate in dipole-dipole interactions.
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Write a balanced reaction for which the following rate relationships are true.
Rate = -1/2 delta[N2O5]/ delta t = 1/4 delta[NO2] = delta[O2]/ delta t
A) 2 NO2O5 ---> 4 NO2 + O2
B) 4 NO2 + O2 ----> 2 N2O5
C) 2 N2O5 ---> NO2 + 4 O2
D) 1/4 NO2 + O2 -----> 1/2 N2O5
E) 1/2 N2O5 ---> 1/4 NO2 + O2
Answers
The balanced chemical equation for the given rate law is 4 NO2 + O2 -> 2 N2O5. This is because the rate law can be written as rate = -1/2 delta[N2O5]/ delta t = 1/4 delta[NO2] = delta[O2]/ delta t. The stoichiometry of the balanced equation shows that 4 moles of NO2 react with 1 mole of O2 to produce 2 moles of N2O5. The exponents in the rate law are determined experimentally through the method of initial rates.
The balanced reaction that satisfies the given rate relationships is; 4 NO₂ + O₂ → 2 N₂O₅. Option B is correct.
To determine the balanced reaction, we need to consider the stoichiometric coefficients that allow us to relate the changes in concentrations to the reaction rate.
According to the given rate relationships:
Rate = -1/2 Δ[N₂O₅]/Δt
Rate = 1/4 Δ[NO₂]
Rate = Δ[O₂]/Δt
From these relationships, we can see that the rate of the reaction is directly proportional to the changes in the concentrations of N₂O₅, NO₂, and O₂.
The balanced reaction 4 NO₂ + O₂ → 2 N₂O₅ satisfies these rate relationships. For every 4 moles of NO₂ and 1 mole of O₂ consumed, 2 moles of N₂O₅ are produced. This reaction allows for the rate of change in the concentrations of N₂O₅, NO₂, and O₂ to be consistent with the given rate relationships.
Therefore, the balanced reaction that matches the given rate relationships is 4 NO₂ + O₂ → 2 N₂O₅.
Hence, B. is the correct option.
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Calculate the ph of a 0. 300 m solution of formic acid, for which the ka value is 1. 80 x 10^-4.
Answers
The pH of a 0.300 M formic acid solution is 0.0073.
What does the dissociation constant Ka?The acid dissociation constant determines the difference between strong and weak acids (Ka). Extremely high Ka values are present in strong acids. The Ka value can be found by looking at the equilibrium constant for the dissociation of the acid. The Ka increases as the acid dissociates more.
PKₐ value is 1.80 × 10⁻⁴
The concentration of formic acid (HCOOH) is 0.300 M.
HCOOH + H₂O ⇄ ⁻(HOOC⁻) + H₃O⁺
(0.300) (x) (x)
Let x represent the concentration of H⁺ that dissociates from HCOOH (formic acid), then [HCOOH] = 0.050 – x
Kₐ = [H₃O⁺] [HOOC⁻] / [HCOOH]
Kₐ = 1.80 × 10⁻⁴ = x²/0.300x- x
let 0.300 -x = 0.300
x² = 1.80 × 10⁻⁴ × 0.300
x² = 0.54 × 10⁻⁴
x² = 54 × 10⁻⁶
x = 7.3 × 10⁻³
pH = - log [H₃O⁺]
pH = - log [x]
pH = - log [7.3 × 10⁻³]
pH = 0.0073
So,
The pH of a 0.300 M formic acid solution is 0.0073.
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what is a mixture of elements and compounds
Answers
The substance in the image above would be classified as a mixture of elements (option E).
What is a compound and mixture?A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.
On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.
According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.
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12. What is the atomic number of the atom that forms an anion with 36 electrons and a Explain(words); write out formula, then solve for missing variable charge of -1?
Answers
The missing variable of (⁻¹) is bromine.
Let the missing variable be X.
No. of electrons in the monoatomic anion (X⁻¹ )= 36
No. of electrons in the monoatomic atom (X) = 35
Atomic No. = No. of protons = No. of electrons in neutral atom = 35
Mass No. = No. of protons + No. of neutrons
= 35 + 45 = 80
Hence, the element must be Br as its mass no is 80 and atomic no is 35.
And the ion is bromide ion or Br⁻¹ ion. It is an anion which gains an electron to achieve octet.
X → Br and X⁻¹ → Br⁻¹
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2. (1:25) How much does the moon pull on the Earth?
A. More than the Earth's pull on the moon
B. Less than the Earth's pull on the moon
C. Equal to the Earth's pull on the moon
Answers
Answer:
a. more than the earth pull on the moon sorry if false
A test for a disease shows positive for 90% of people who have the disease and negative for 80% of people who do not have the disease. 1% of the population has the disease. (a) What is the probability a randomly selected person from the population tests positive for the disease? (b) Given a person tests negative, what is the probability he/she does in fact not have the disease?
Answers
The probability a randomly selected person from the population tests positive for the disease is 0.0945 or 9.45%.
What is the likelihood of a positive test result?The probability of testing positive for the disease can be calculated by considering both the true positive rate (90% of people with the disease) and the false positive rate (20% of people without the disease).
Given that 1% of the population actually has the disease, the remaining 99% does not.
To calculate the probability of a positive test result, we multiply the probability of having the disease (1%) by the true positive rate (90%), and also multiply the probability of not having the disease (99%) by the false positive rate (20%).
Therefore, the probability of a positive test result is:
(0.01 * 0.90) + (0.99 * 0.20) = 0.009 + 0.198 = 0.207
This translates to 20.7%, or 0.207 probability, rounded to two decimal places.
The probability of a positive test result depends not only on the accuracy of the test (true positive rate and false positive rate) but also on the prevalence of the disease in the population.
In this case, the low prevalence of the disease (1%) means that even with a relatively high true positive rate, the overall probability of testing positive is still relatively low (9.45%).
This highlights the importance of considering both the test accuracy and the prevalence of the disease when interpreting test results.
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If a drought occurs, which of the following is true?
The lettuce and tomato plants would survive.
The pistachios would die
The lettuce and tomato plants would die.
The pistachios would survive.
Answers
Answer:
The pistachio would survie and The lettuce and tomato would die
Explanation:
because pistachios need less water to grow but the lettuce and tomato need more water
The distribution of water on the surface of earth is not uniform. Drought is a condition which is developed because of the lack of water. Among the given statements, The pistachios would survive is true. The correct option is D.
What is Drought?The prolonged dry period in the natural climate cycle of the earth which can occur anywhere in the world is known as Drought. It is one of the dangerous natural disaster characterized by the lack of precipitation, shortage of water, etc.
The Drought condition can create a serious impact in the sector of health, agriculture, economy and the environment. Due to the lack of rainfall, the evaporation of water from the soil will not occur and thus the soil becomes dry.
Here from the given pictures, pistachios need only a small amount of water to survive. But lettuce and tomato plants require high volumes of water.
Thus the correct option is D.
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Select the step(s) that will compose a rationale for the cation Ag being absent in an unknown (but Pbº is present). Select one or more: a. A yellow precipitate did not form when KyCrO was added in step 1-C. b. The white solid did not turn black upon addition of NaOH and SnCl2. c. The presence of a light blue decantate in step 1-A. d. All of the white precipitate from step 1-A dissolved in hot water. e. A lack of dark blue colored solution after addition of 15 M NH 3. f. A white precipitate did not form in step 2-B. g. A reddish brown precipitate did not form after adding K Fe(CN)6- No white precipitate formed when 6 M HCI was added to the unknown solution in step 1.A. h. The white precipitate from step 1-B dissolved in 6 M NH3 and then reformed when 6 M HNO, was added.
Answers
The steps that can be used as a rationale for the absence of Ag in an unknown solution (but with Pb²⁺ present) in a chemical analysis experiment are: a, b, d, e, and h.
Steps (a), (b), (d), (e), (f), and (g) can be used as a rationale for the absence of Ag in an unknown solution with Pb²⁺ present in a chemical analysis experiment. The lack of yellow precipitate with KyCrO, no blackening of the white solid with NaOH and SnCl₂, and the absence of a white precipitate with 6M HCl suggest the absence of Ag.
The presence of a light blue decantate in step 1-A and the lack of dark blue solution after the addition of 15M NH₃ further support this conclusion. Additionally, the absence of a white precipitate in step 2-B and the lack of reddish-brown precipitate after adding KFe(CN)₆⁻ also indicate the absence of Ag in the unknown solution.
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--The complete question is, Which step(s) can be used as a rationale for the absence of Ag in an unknown solution (but with Pb²⁺ present) in a chemical analysis experiment? Select all that apply:
a. A yellow precipitate did not form when KyCrO was added in step 1-C.
b. The white solid did not turn black upon addition of NaOH and SnCl2.
c. The presence of a light blue decantate in step 1-A.
d. All of the white precipitate from step 1-A dissolved in hot water.
e. A lack of dark blue colored solution after addition of 15 M NH3.
f. A white precipitate did not form in step 2-B.
g. A reddish brown precipitate did not form after adding K Fe(CN)6-
h. The white precipitate from step 1-B dissolved in 6 M NH3 and then reformed when 6 M HNO3 was added.
Note: The question is referring to a specific chemical analysis experiment, where the absence of Ag needs to be justified in an unknown solution with the presence of Pb²⁺.--
δs for the following reaction is positive. true or false? n2o4(g) → 2 no2(g)
Answers
The entropy change (ΔS) for a reaction involving a decrease in the number of moles of gas molecules will be negative, while the entropy change for a reaction involving an increase in the number of moles of gas molecules will be positive. Therefore, for the given reaction:n2o4(g) → 2 no2(g). The number of gas molecules on the left side is one, while the number of gas molecules on the right side is two. As a result, there has been an increase in the number of moles of gas molecules (from one to two).Since the number of moles of gas molecules has increased in the reaction, we can conclude that the entropy change (ΔS) for the reaction is positive. Therefore, the statement "δs for the following reaction is positive" is true.
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The given statement, "The Δs for the following reaction is positive" is true. The Δs for the given reaction is positive (True). When we talk about entropy, we talk about the randomness, disorder, or chaos of a system.
The Δs or entropy change is a measure of the extent of randomness or disorder in the system, and it is expressed in joules per Kelvin (J/K).The Δs value can be positive, negative, or zero. If the entropy of the products is greater than that of the reactants, Δs will be positive. Δs will be negative if the entropy of the reactants is greater than that of the products, while Δs will be zero if there is no change in the system's randomness or disorder.The given reaction is:N2O4(g) → 2 NO2(g)The reaction has two molecules of NO2 in the product, whereas there is only one molecule of N2O4 in the reactant. As a result, there is a greater degree of randomness in the product than in the reactant. Hence, Δs for the given reaction is positive.Therefore, the given statement, "The Δs for the following reaction is positive" is true.
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Please help!!!
Which statement best defines the relationship between work and energy?
O Work can transfer energy between objects and increase radiant energy.
Work can transfer energy between objects and cause a change in the form of energy.
Work can transfer energy between objects and decrease nuclear energy.
O Work can transfer energy between objects and cause a change in the amount of total energy.
Answers
Answer:
Its B
Explanation:
I just did the test on edge.
Answer: its B
Explanation:I need points.
Iron nail wrapped with copper wire Determine the standard reduction potential of the cathode half-reaction, the standard reduction potential of the anode half-reaction, and the standard potential of the cell. E°cathode ____
(V) E° anode ___ (V) E° cell ___ (V)
Answers
The standard reduction potential of the cathode half-reaction is -0.36V,
The standard reduction potential of the anode half-reaction is +0.34V,
and the standard potential of the cell is -0.02V.
The cathode half-reaction is the reduction of iron (Fe²⁺) to iron (Fe):
Fe²⁺ + 2e⁻ -> Fe; E°cathode = -0.36V.
The anode half-reaction is the oxidation of copper (Cu) to copper (Cu²⁺):
Cu -> Cu²⁺ + 2e⁻; E°anode = +0.34V.
The standard potential of the cell is determined by subtracting the standard reduction potential of the anode from the standard reduction potential of the cathode:
E°cell = E°cathode - E°anode
= -0.36V - (+0.34V)
= -0.02V.
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who wants points from me?
Answers
Answer:
ok I want
have a good day better than yesterday
thanks a lot for your points
me too ahahahahahahahaha
Chemical properties can be used to
(1) differentiate between two compounds
(2) determine the temperature of a substance
(3) determine the density of a substance
(4) differentiate between two neutrons
Answers
Answer:
differentiate between two compounds
The balanced chemical equation for the reaction between sodium chloride and silver nitrate is: NaCl(aq) AgNO3(aq) AgCl(s) NaNO3(aq) We can interpret this to mean: ... 1 mole of sodium chloride and moles of silver nitrate React to produce ... moles of silver chloride and moles of sodium nitrate
Answers
Answer:
1 mole of NaCl reacts with 1 mole of AgNO₃ to produce 1 mole of AgCl and 1 mole of NaNO₃
Explanation:
The given reaction is a double decomposition (metathesis) reaction. A reaction in which the products are formed by the exchange of the ions present in the two reactants. NaCL and AgNO₃ exchange ions to form AgCl, which precipitates and NaNO₃.
The balanced equation for reaction is given below;
NaCl(aq) + AgNO₃(aq) ----> AgCl(s) + NaNO₃(aq)
In the reaction above, the mole ratio of the reactants to products is 1 : 1 ---> 1 : 1
This means that 1 mole of NaCl reacts with 1 mole of AgNO₃ to produce 1 mole of AgCl and 1 mole of NaNO₃.
Given the molar mass of the compounds above;
NaCl = 58.5 g/mol; AgNO₃ = 170 g/mol; AgCl = 143.5 g/mol; NaNO₃ = 85 g/mol
Therefore, 58.5 g of NaCl reacts with 170 g of AgNO₃ to produce 143.5 g of AgCl and 85 g of NaNO₃
When we inhale oxygen, we expire it as water vapors. We can regenerate oxygen by reacting the water vapor with potassium superoxide KO2. When we react 25.0 grams of water vapor with 25.0 grams of potassium superoxide, we obtain 15.0 grams of potassium hydroxide. Oxygen is also created during the reaction. What is the theoretical and percent yield of potassium hydroxide?
Answers
The theoretical and percent yield of potassium hydroxide would be 19.771 g and 75.83% respectively.
Stoichiometric problemThe balanced chemical equation for the reaction between water vapor and potassium superoxide is:
4 KO2 + 2 H2O → 4 KOH + 3 O2
From the balanced equation, we can see that for every 4 moles of KO2 reacted, 4 moles of KOH are produced.
Calculate the number of moles of KO2 used:
25.0 g KO2 × (1 mol KO2 / 71.098 g KO2) = 0.3520 mol KO2
Calculate the number of moles of KOH produced:
According to the balanced equation, 4 moles of KO2 produce 4 moles of KOH, so:
0.3520 mol KO2 × (4 mol KOH / 4 mol KO2) = 0.3520 mol KOH
Calculate the theoretical yield of KOH:
The molar mass of KOH is 56.105 g/mol, so:
0.3520 mol KOH × 56.105 g KOH/mol = 19.771 g KOH
Therefore, the theoretical yield of KOH is 19.771 g.
Calculate the percent yield of KOH:
The actual yield of KOH is given as 15.0 g, so:
Percent yield = (actual yield / theoretical yield) × 100%
Percent yield = (15.0 g / 19.771 g) × 100%
Percent yield = 75.83%
Therefore, the percent yield of KOH is 75.83%.
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To calculate an Rp for a compound,
you divide the distance traveled by
the compound by
Answers
How many electrons are contained in a neutral atom of an element with an atomic number of 19 and an atomic mass of 39. 9
Answers
Answer:19
Explanation:
Which 1 m solution would have the highest vapor pressure at a given temperature?
c6h12o6 kcl nac2h3o2 li2so4
Answers
The 1 m solutions of C6H1O6 have the highest vapor pressure at a given temperature.
Vapor pressure is defined as the tendency of a liquid to convert into a vapor state. The vapor pressure depends on temperature, surface area, intermolecular forces, and the number of moles of a substance.
The higher the number of moles of particles in solute, the lower the vapor pressure and vice versa.
C6H12O6 has the highest vapor pressure among the given options because it has the lowest number of moles or particles in the solute. The remaining options have more moles of particles in the solute.
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what is the ratio for 3 : 20 = 6 : _____
Answers
Answer:
3 : 20 = 6 : 40
Explanation:
3 is multiplied by 2 so the 20 is also multiplied by 2 giving you the answer above.
How much energy is needed to convert 15.0 g of ice at -5.0 oC into water at 50.0 oC?
Answers
Using thermodynamics
\(\\ \sf\longmapsto Q=mc∆T\)
\(\\ \sf\longmapsto Q=0.015(328)(4184)\)
\(\\ \sf\longmapsto Q=20585.28J\)
How did the improvement of the telescope contribute to the modern model of the solar system? (1 point) the improve telescope showed scientists that the solar system contained planets. the improve telescope showed scientists that the solar system contained stars. the improve telescope showed scientists that the solar system contained moons. the improve telescope showed scientists that the solar system contained comets.
Answers
The improved telescope showed scientists that the solar system contained comets.
What is the solar system?The solar system has to do with the arrangement of the sun and the planets. The sun lies at the center of the solar system and then the sun is surrounded by the planets that move all around the sun in concentric circles.
Now we know that the telescope is the kind of object that could be used in the study of the outer space. We could use it to study the stars as well as other celestial bodies in the study of astronomy.
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explain how gravity will affect the growth of the plant's stem and roots
Answers
Answer:
Honestly this is the first question I’m stumped on
Explanation:
Answer:
Plants respond directly to Earth's gravitational attraction, and also to light. Stems grow upward, or away from the center of Earth, and towards light. Roots grow downward, or towards the center of Earth, and away from light. This process turns the stem so that it once again grows upward, presumably toward the light.
Explanation:
The shutdown decision can be restated in terms of producer surplus by saying that a firm should produce in the short run as long as revenue exceeds producer surplus. producer surplus exceeds fixed cost. producer surplus exceeds variable cost. producer surplus is positive. profit and producer surplus are equal.
Answers
The shutdown decision can be restated in terms of producer surplus by saying that A, a firm should produce in the short run as long as revenue exceeds producer surplus
Producer surplus represents the difference between the revenue received by the firm and the minimum amount needed to cover variable costs. If the producer surplus is positive, it indicates that the firm is covering its variable costs and contributing towards fixed costs. In this situation, it is financially viable for the firm to continue production, even if it's not generating profit.
However, if the producer surplus becomes negative, the firm is unable to cover its variable costs, and a shutdown may be the optimal decision. It is important to note that the focus is on variable costs rather than fixed costs or profit, as fixed costs will still need to be paid regardless of production levels. So therefore the shutdown decision, in terms of producer surplus, the correct answer is A. a firm should continue production in the short run as long as the producer surplus exceeds variable costs.
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________ need to be sure to consume adequate protein, fiber, fluid, vitamins d and b12, and the minerals iron, calcium, and zinc.
Answers
A balanced and healthy diet, individuals need to consume adequate amounts of protein, fiber, fluids, vitamins D and B12, as well as the minerals iron, calcium, and zinc.
1. Protein is crucial for building and repairing tissues, and it can be found in sources such as lean meats, poultry, fish, dairy products, legumes, and nuts.
2. Fiber aids in digestion and can be obtained from whole grains, fruits, vegetables, and beans.
3. Fluids, especially water, are essential for maintaining hydration and supporting bodily functions.
4. Vitamin D helps with calcium absorption and is found in fatty fish, fortified dairy products, and sunlight exposure.
5. Vitamin B12 is important for nerve function and can be found in animal products like meat, eggs, and dairy.
6. Iron is necessary for oxygen transport and can be obtained from sources like lean meats, spinach, and fortified cereals.
7. Calcium is essential for strong bones and can be found in dairy products, leafy greens, and fortified foods.
8. Zinc supports the immune system and is found in foods like shellfish, lean meats, and legumes.
Remember to incorporate a variety of these nutrient-rich foods into your diet to maintain overall health and wellbeing.
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Why are polar gases, such as H2O and NH3, more likely to deviate from the ideal gas behaviors described by the kinetic molecular theory? (3 points)
Question 4 options:
1)
The density of these gases is high, increasing the number of collisions and reducing their elasticity.
2)
The fluidity of these gases is high, resulting in a higher average kinetic energy.
3)
The particles have a significant volume, reducing the space between the moving particles.
4)
The particles have high intermolecular forces, reducing the elasticity of their collisions.
Answers
Answer:
The particles have high intermolecular forces, reducing the elasticity of their collisions.
Explanation:
for the reaction r(g) 2s(g) → 2x(g) 2y(g) the following data were collected at constant temperature. determine the correct rate law for this reaction. Trial Initial [A] Initial [B] Initial Rate
(mol/L) (mol/L) (mol/(L·min))
1 0.125 0.200 7.25
2 0.375 0.200 21.75
3 0.250 0.400 14.50
4 0.375 0.400 21.75
A) Rate = k[A] [B]
B)Rate = k[A]^2 [B]
C)Rate = k[A] [B]^2
D)Rate = k[A]
E)Rate = k[A]3
Answers
The correct rate law for the given reaction is Rate = C)k[A][B]^2.
The rate law can be determined by comparing the initial rates of the reaction at different concentrations of reactants. As the initial rate doubles when the concentration of B is doubled, the reaction is second order with respect to B.
Similarly, as the initial rate quadruples when the concentration of A is doubled, the reaction is first order with respect to A. Therefore, the overall rate law is Rate = k[A][B]^2.
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2.) The
is considered the basic unit of any element.
Answers
Answer:
The basic unit of any element would be the atom.