the reverse reaction is first order in b and the rate constant is 4.70×10-2 s–1 at the same temperature.
Answers
Given,The reverse reaction is first order in b and the rate constant is 4.70×10^-2 s–1 at the same temperature.Meaning, the rate law for the reverse reaction would be :`r=k[b]`Where, k = rate constant, [b] = concentration of B.
Since the reverse reaction is first order in b, therefore, the rate law would be a first-order rate law, which can be integrated as :`[B]/[B]_0=e^(-kt)`Where, [B] = concentration of B at time t, [B]_0 = initial concentration of B, k = rate constant, t = time.
To find the main answer, we need to use the rate law given and the integrated rate law as follows:`r=k[B]``[B]/[B]_0=e^(-kt)`Multiply these two equations :`r[B]/[B]_0=ke^(-kt)`Rearrange and solve for r:`r = k[B]_0e^(-kt)`Thus, the main answer is `r = k[B]_0e^(-kt)`.Explanation:It is possible to derive the integrated rate law of a reaction by integrating the rate law of the reaction. This law provides the relationship between the concentration of the reactants and the time of reaction.
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Related Questions
What is the pOH of a substance with a pH of 10.3?
Answers
Answer:
3.7
Explanation:
pH+pOH=14
10.3+pOH=14
pOH =14-10.3
3.7
Please help guys
When the nucleus of an atom is split, the release of __1__ produces a __2__ reaction.
1)
A. Protons
B. Chain
C. Nuclei
D. Neutrons
E. Spontaneous
F. Nuclear
G. Electrons
2)
A. Protons
B. Chain
C. Nuclei
D. Neutrons
E. Spontaneous
F. Nuclear
G. Electrons
Answers
Explanation:
probably protons would be released and cause a spontaneous reaction
This equation represents cellular respiration.
C6H12O6 +602
6 CO2 + 6H2O + energy
Which table lists all the atoms in reactants and products of cellular respiration?
Reactants 6 C 12 H 18 O
ΟΑ.
Products 6 C 12 H 18 O
Reactants 6 C 6H 2
Ов.
Products 6 C 12 H 120
Reactants 6 C 12 H 120
C.
Products 6 C 12 H 30
Reactants 6 C 12 H 18 0
D.
Products 1C6H 18 O
Please hurry
Answers
if you work it put you will get the 3rd one I think
Y'all, I need your help, these science questions are due tonight and I'm really stuck , please show work as well
Answers
Answer:
Explanation:
a) v=w*lambda
wavelength=5/2.5
wavelength=2m
b)342/320=1.06875m
c)342/1.5=228 Hz
d)4.6153=v/wave
For a solution, [H+] = 3 x 10-11M.
What is the pH?
Answers
Answer:
pH≈10.5
Explanation:
-log(3 x 10-11)≈10.5
Drag and drop each of the three molecular sizes to the location each would occur during the process of column chromatography.
Answers
The correct positions of the different molecular sizes within the column chromatography are as follows: Small molecules: Start, Intermediate molecules: Middle, and Large molecules: End
Chromatography is based on the principle where molecules in mixture applied onto the surface or into the solid, and fluid stationary phase (stable phase) is separating from each other while moving with the aid of a mobile phase.
During the process of column chromatography, the different molecular sizes will settle at different positions. The small molecules are going to travel through the column at a much slower pace than the larger molecules. The three molecular sizes involved in the process of column chromatography are the following:
i) Small molecules
ii) Intermediate molecules
iii) Large molecules
Now, we have to place these molecules in their respective positions. The following is a drag and drop table which shows the positions of each molecule within the chromatography process:
Molecule size Position
Small molecule Start
Intermediate molecule Middle
Large molecule End
Therefore, the correct positions of the different molecular sizes within the column chromatography are as follows:
Small molecules: Start Intermediate molecules: Middle Large molecules: End
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Calculate the number of moles at r.t.p in 2dm of carbon dioxide
Answers
Answer:
0.083 mol
Explanation:
Molar volume of gas at r.t.p = 24 dm³
Number of moles = volume(dm³) / 24
Number of moles = 2/24 = 0.083...
The cultures of prehistoric humans are known mostly through the excavation of stone tools and other relatively imperishable artifacts. The early tool making traditions are often referred to as being paleolithic (literally "Old Stone Age). The Oldowan and Acheulian tool traditions of the first humans were the simplest applied research basic research Scientihe thought O philosophies technologies
Answers
The cultures of prehistoric humans are primarily known through the excavation of stone tools and other durable artifacts, such as the Oldowan and Acheulian tool traditions.
Stone tools and imperishable artifacts serve as key archaeological evidence for understanding prehistoric cultures. Through meticulous excavation and analysis, archaeologists have been able to piece together the lifestyles, technological advancements, and social behaviors of early human societies. The term "paleolithic" refers to the Old Stone Age, a time when humans relied on stone tools as their primary implements.
The Oldowan tool tradition is considered the earliest stone tool industry, dating back around 2.6 million years ago. It is characterized by simple tools, such as choppers and scrapers, which were crafted by flaking off pieces from larger stones. These tools were primarily used for basic activities like butchering and processing animal carcasses.
Later, the Acheulian tool tradition emerged around 1.76 million years ago, representing an advancement in stone tool technology. Acheulian tools, such as handaxes and cleavers, were more refined and standardized, showcasing an increased level of sophistication in tool-making techniques. These tools served a wide range of purposes, including hunting, woodworking, and shaping raw materials.
By studying the Oldowan and Acheulian tool traditions, researchers gain valuable insights into the cognitive abilities, cultural development, and technological progress of early humans. The examination of these artifacts provides evidence of their adaptability, problem-solving skills, and the gradual refinement of their tool-making techniques over time.
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which gas is plotted using the y-axis on the right?which gas is plotted using the y-axis on the right?methane (ch4)carbon dioxide (co2)nitrous oxide (n2o)the total of all three gases
Answers
Without having access to the specific graph you are referring to, I cannot definitively determine which gas is plotted using the y-axis on the right. However, the gases you mentioned are methane (CH4), carbon dioxide (CO2), and nitrous oxide (N2O). It is possible that the graph shows the total of all three gases as well. Please refer to the graph's labels or legend for clarification on which gas is plotted on the right y-axis.
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Which amino acid is always the first one to be incorporated into a newly made protein? this is because of the identity of the only start codon.
Answers
Methionine is always the first one to be incorporated into a newly made protein followed by identification of the only start codon on mRNA.
Amino acids are transferred by initiator tRNAs to the mRNA strand by the process of translation. Each tRNA has an anticodon, which is a group of three nucleotides that pairs with an appropriate mRNA codon to form a stable bond. The amino acid that the codon specifies is carried by the opposite end of the tRNA. AUG is one codon that serves as a "start" signal to initiate translation (it also specifies the amino acid methionine).
All newly created proteins have methionine as the first amino acid at their N-terminal end, the end of a protein that is synthesised initially, because the initiator tRNA always carries this amino acid (in bacteria, a modified version of methionine called formylmethionine is employed).
Transfer RNAs, or tRNAs, are molecules that read an mRNA's codons sequentially (from the 5' end to the 3' end) during translation.
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a saline solution has a concentration ratio of 0.5 milligrams of salt in 75 millilitres of solution
how many milligrams of salt will be needed to produce 180 millilitres of saline soluyhaving this same concentration
Answers
To produce 180 millilitres of a saline solution of the same concentration, we need 1.2 milligrams of salt.
It is given that a ratio of 0.5 milligrams of salt is present in 75 millilitres of solution. Let us assign a variable x to the amount of salt present in 180 millilitres of saline solution.
To maintain the same concentration we can use the method of cross-multiplication:
The following equation can be used to determine the value of x:
0.5 mg / 75 ml = x mg / 180 ml
( 0.5 × 180) / 75 = x mg
x mg = 90 / 75
Hence x is approximately equal to 1.2 mg.
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Why do scientific and engineering problems often require multidisciplinary efforts?
A) People with similar backgrounds and knowledge will be able to solve problems efficiently.
B) Few people are experts in multiple fields, so teams of people can work together to tackle a problem.
C) Working with people that have different skill sets discourages creative thoughts and ideas. D) Having a large number of people working together ensures that new insights in solving a problem will occur.
Answers
The correct answer is option D. Having a large number of people working together ensures that new insights in solving a problem will occur.
Engineers and scientists have knowledge in different fields. Science is a study of nature and the scientists are the people who study science, the study of nature or how the natural world works.
Scientists study and gain knowledge about the nature and the engineers apply it to make use of the knowledge about science.
It can be said they are interdependent. As working closely, the data is exchanged or shared between scientists and engineers. Both scientists and engineers have their own ideas and thoughts.
Scientists can help engineers to develop analytical and research skill which can help engineers to write better code to make best use of science.
Thus, people working together on different aspects, they can have new insights. This helps to look at the situation from different angles and can solve the problems easily and in a better way.
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A chemical bond formed when two atoms share two pairs of electrons is a ________ bond; it is best described as ________.
Answers
Answer:
A chemical bond formed when two atoms share two pairs of electrons is a double bond; it is best described as a covalent bond.
Explanation:
A chemical bond in which two pairs of electrons are shared has to be defined as covalent since ionic bonds don't involve electron sharing. They consist only of electrostatic attraction between ions.
CH3COOH CH3COO– + H+
You start with 0.05 moles of acetic acid in 500 mL of water. At equilibrium, the pH of the solution is 2.873. What is the equilibrium constant of this reaction? Hint: You will need to calculate an antilog using a scientific calculator.
Answers
(a)
pH = 4.77
; (b)
[
H
3
O
+
]
=
1.00
×
10
-4
l
mol/dm
3
; (c)
[
A
-
]
=
0.16 mol⋅dm
-3
Explanation:
(a) pH of aspirin solution
Let's write the chemical equation as
m
m
m
m
m
m
m
m
l
HA
m
+
m
H
2
O
⇌
H
3
O
+
m
+
m
l
A
-
I/mol⋅dm
-3
:
m
m
0.05
m
m
m
m
m
m
m
m
l
0
m
m
m
m
m
l
l
0
C/mol⋅dm
-3
:
m
m
l
-
x
m
m
m
m
m
m
m
m
+
x
m
l
m
m
m
l
+
x
E/mol⋅dm
-3
:
m
0.05 -
l
x
m
m
m
m
m
m
m
l
x
m
m
x
m
m
m
x
K
a
=
[
H
3
O
+
]
[
A
-
]
[
HA
]
=
x
2
0.05 -
l
x
=
3.27
×
10
-4
Check for negligibility
0.05
3.27
×
10
-4
=
153
<
400
∴
x
is not less than 5 % of the initial concentration of
[
HA
]
.
We cannot ignore it in comparison with 0.05, so we must solve a quadratic.
Then
x
2
0.05
−
x
=
3.27
×
10
-4
x
2
=
3.27
×
10
-4
(
0.05
−
x
)
=
1.635
×
10
-5
−
3.27
×
10
-4
x
x
2
+
3.27
×
10
-4
x
−
1.635
×
10
-5
=
0
x
=
1.68
×
10
-5
[
H
3
O
+
]
=
x
l
mol/L
=
1.68
×
10
-5
l
mol/L
pH
=
-log
[
H
3
O
+
]
=
-log
(
1.68
×
10
-5
)
=
4.77
(b)
[
H
3
O
+
]
at pH 4
[
H
3
O
+
]
=
10
-pH
l
mol/L
=
1.00
×
10
-4
l
mol/L
(c) Concentration of
A
-
in the buffer
We can now use the Henderson-Hasselbalch equation to calculate the
[
A
-
]
.
pH
=
p
K
a
+
log
(
[
A
-
]
[
HA
]
)
4.00
=
−
log
(
3.27
×
10
-4
)
+
log
(
[
A
-
]
0.05
)
=
3.49
+
log
(
[
A
-
]
0.05
)
log
(
[
A
-
]
0.05
)
=
4.00 - 3.49
=
0.51
[
A
-
]
0.05
=
10
0.51
=
3.24
[
A
-
]
=
0.05
×
3.24
=
0.16
The concentration of
A
-
in the buffer is 0.16 mol/L.
hope this helps :)
The equilibrium constant of this reaction is 1.80×10-5
Given data,
pH of solution = 2.873
Number of moles of acetic acid (m) = 0.05 moles
Volume of water (V) = 500 mL = 0.5L
So, concentration (C) = m/V in lit = 0.05/0.5 = 0.1 M
Equilibrium constant ( K ) = \([CH_{3} COO-]\)×\([H+_{} ]\)/\([CH_{3} COOH]\)
Since, acetic acid is weak acid,
So, Equilibrium constant ( K ) = \([H+]^{2}\)/\([CH_{3} COOH]\) ....(i)
As the pH = 2.873, the \([H+_{} ]\) is antilog of -2.873 or 1.34×10-3 M.
Putting the value of concentration of \(H+_{}\) and \(acetic_{} acid\) in equation (i).
Equilibrium constant ( K ) = 1.80×10-5
What is weak acid ?The acid which is partially dissociates into ions on dissolving in aqueous solution is called weak acid.
Example: \(acetic_{} acid\).
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Which major branch of chemistry would be most concerned
with studying a series of chemical reactions in order to
measure the amount of heat being released in each one?
Answers
Physical chemistry a major branch of chemistry would be most concerned with studying a series of chemical reactions in order to measure the amount of heat being released in each one.
Understanding the physical characteristics of atoms and molecules, how chemical processes take place, and what these characteristics indicate are the main goals of physical chemists. Their findings are based on an understanding of chemical characteristics and a description of how they behave utilizing physics theories and mathematical calculations.Thermochemistry, which encompasses the study of the heat energy of chemical processes occurring during phase transitions like gas to liquid or vice versa, is one of the main examples of physical chemistry. It provides information on entropy, heat capacity, Gibbs free energy, or formation heat.For more information on chemistry kindly visit to
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3. Which nuclear radiation is similar to high energy X-rays?
beta
alpha
gamma
neutron
Answers
Answer: Gamma radiation
Explanation:
Gamma rays have high penetrating power, similar to high-energy X-rays.
According to the
graph, what happens
to the concentration
of A over time?
Concentration (M)
Reaction: 2A A₂
Time (sec)
A. It decreases and then levels out.
B. It decreases consistently.
C. It increases and then levels out.
D. It increases consistently.
Answers
The concentration of A decreases and then levels out. Option A
How does concentration of the reactant change?
In many chemical reactions, a reactant is consumed as the reaction progresses, leading to a decrease in its concentration over time. The reactant molecules are transformed into products, and as the reaction proceeds, the concentration of the reactant gradually diminishes.
At equilibrium, the concentrations of both reactants and products remain relatively constant over time, although they can coexist.
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You have 10.0 g each of na, c, pb, cu and ne. which contains the largest number of moles?
Answers
Carbon (C) contains the largest number of moles.
Number of Moles of a substance can be defined as the ratio of given mass of the substance to the Molecular Mass of the substance.
We can write,
Number of moles = Given Mass / Molecular Mass euation1
Given Mass of Na, C, Pb, Cu, Ne each = 10.0g
Molecular mass of Na = 22.9898 u
Molecular mass of C = 12u
Molecular mass of Pb = 207.2u
Molecular mass of Cu = 63.546 u
Molecular mass of Ne = 20.1797 u
After substituting the values of molecular mass and given mass of elements in equation1 , we will get
Number of moles of Na = (10/22.9898) = 0.4350
Number of moles of C = (10/12) = 0.8333
Number of moles of Pb = (10/207.2) = 0.0483
Number of moles of Cu = (10/63.546) = 0.1574
Number of moles of Ne = (10/20.1797) = 0.4955
So, we can clearly see that Carbon contains the largest number of moles.
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an alpha particle interacts with an oxygen-16 nucleus to form a neon-20 nucleus. what type of nuclear reaction does this exemplify? justify your answer.
Answers
The interaction described, where an alpha particle (helium-4 nucleus) interacts with an oxygen-16 nucleus to form a neon-20 nucleus, exemplifies a nuclear reaction known as nuclear fusion.
Nuclear fusion is the process in which two or more atomic nuclei come together to form a heavier nucleus. In this case, the alpha particle (helium-4 nucleus) is fusing with the oxygen-16 nucleus to produce a neon-20 nucleus. Nuclear fusion reactions involve the release of a significant amount of energy due to the conversion of mass into energy, as described by Einstein's famous equation E = mc^2. This energy release is the driving force behind processes like the sun's energy production and the development of hydrogen bombs.
The fusion of light elements, such as the fusion of hydrogen isotopes in stars, is responsible for the immense energy output and is a fundamental process in the universe. In this specific reaction, the fusion of an alpha particle with an oxygen-16 nucleus leads to the formation of a heavier nucleus, neon-20, and is an example of a nuclear fusion reaction.
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from the 1h nmr spectrum of dibenzalacetone, can you deduce what stereoisomer(s) of dibenzalacetone is (are) formed? the chemical shift of the alkene protons is downfield from the expected resonance. what is the shift due to?
Answers
From 1H NMR spectrum of dibenzalacetone, cis-cis, cis-trans, trans-cis and trans-trans isomers are formed of dibenzalacetone.
There are three signals visible in the methyl acetate 1H NMR spectrum above. The standard reference chemical tetramethylsilane is shown by the peak on the far right. The reason for this is chemical equivalency. The three Ha protons in the methyl group, which is bound to the C=O molecule, are all in the same chemical environment and are thus chemically identical. The total six hydrogens may be separated into two groups.
The resonance frequency of all chemically equivalent hydrogens is the same when an external magnetic field is introduced. The three chemically comparable Hb protons in the methyl group bound to the O atom also exhibit the opposite signal. This explains why the molecule methyl acetate has a total of two signals.
Understanding the NMR spectrum requires the capacity to distinguish between protons in a molecule that are chemically comparable and those that are not. We should be able to forecast the number of signals present in the 1H NMR spectra for the chemical whose structure is known. On the other hand, counting the number of signals in the spectrum reveals the number of distinct sets of protons in the molecule, and that is the most significant information to identify the structure of the chemical, if the 1H NMR spectrum is provided for an unknown drug.
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_________ change is a change in matter that results in a material changing from one state to another without any change in chemical properties. Example: solid ice changes to liquid water.
Answers
Answer:
Physical change
Explanation:
Angiosperms produce brightly colored blooms and sweet-smelling flowers. Why have angiosperms developed these adaptations? A. to ensure seed dispersal B. to keep predators from eating the plants C. to attract pollinators and help ensure fertilization D. to allow time for seed development
Answers
Answer:
C
Explanation:
Angiosperms have developed these adaptations because it attracts pollinators which helps the ecosystem grow.
Describe an experiment to determine rate of reaction
Answers
Answer:
Temperature. An increase in temperature typically increases the rate of reaction. An increase in temperature will raise the average kinetic energy of the reactant molecules.
an unbalanced 16.0 N force is applied to a 2.0 kg mass. what is the acceleration of the mass
Answers
The acceleration of the mass is 8.0 m/s² when an unbalanced 16.0 N force is applied to a 2.0 kg mass.
To calculate the acceleration of the mass, we can use Newton's second law of motion, which states that the force acting on an object is equal to the mass of the object multiplied by its acceleration (F = ma).
We know that the force acting on the object is 16.0 N, and the mass of the object is 2.0 kg. So, we can use the equation to solve for the acceleration:
a = F ÷ m
where, a = acceleration, F = force (16.0 N), m = mass (2.0 kg)
So,
a = 16.0 N ÷ 2.0 kg = 8.0 m/s²
Therefore, the acceleration of the mass is 8.0 m/s²
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extinguishers containing film forming fluoroprotein (fffp) are usually located where which of the following are in use quuizlet in Class A, B, and C fires
Answers
Fire extinguishers containing film-forming fluoroprotein (FFFP) are usually located where there is a potential for Class A, B, and C fires.
FFFP is a type of fire extinguishing agent that is effective against Class A, B, and C fires. Class A fires involve ordinary combustibles such as wood and paper, Class B fires involve flammable liquids and gases, and Class C fires involve electrical equipment. FFFP works by creating a film on the surface of the fuel, which helps to prevent re-ignition.
The film also helps to cool the fuel, reducing the likelihood of the fire spreading or re-igniting. This makes FFFP an effective option for a wide variety of fires, including those involving oil, gasoline, and other flammable liquids.
FFFP fire extinguishers are a versatile option for locations where there is a potential for multiple types of fires. They can be used in a variety of settings, including industrial, commercial, and residential settings.
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Study the reactions for the formation of compounds from their elements. I. C(s) + O2(g) → CO2(g) ΔHf = −394 kJ II. H2(g) + 12O2(g) → H2O(l) ΔHf = −242 kJ III. 2C(s) + 3H2(g) → C2H6(g) ΔH =−84 kJ The combustion of C2H6 is shown by the following equation: C2H6(g) + 72O2(g) → 2CO2(g) + 3H2O(l) Which option correctly gives the enthalpy of combustion of 0.2 moles of C2H6(g)? −1,430 kJ 286 kJ −286 kJ 1,430 kJ Exam 3 Click on the numbers to jump from one question to another. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
Answers
Answer:
The correct option is -286 kJ
Explanation:
The given parameters are
C(s) + O₂(g) → CO₂(g) ΔHf = -394 kJ
H₂(g) + 12O₂(g)→H₂O ΔHf = -242 kJ
2C(s) + 3H₂(g)→C₂H₆(g) ΔH = -84 kJ
Te given equation is C₂H₆(g) + 7/2O₂(g) →2CO₂(g) + 3H₂O(l)
The heat of formation or enthalpy of combustion = Heat of formation of the products - Heat of formation of the reactants
The enthalpy of combustion of the reaction = 2*(-394) + 3*(-242)- ((-84)+7/2*0)) = -1,430 kJ
Given that the reaction consists of one mole of C₂H₆(g), we have;
The enthalpy of combustion of one mole of C₂H₆(g) = -1,430 kJ
Therefore, the enthalpy of combustion of 0.2 mole of C₂H₆(g) = -1,430 kJ × 0.2 = -286 kJ
The correct option = -286 kJ.
Answer:
Positive 1,430
Explanation:
why a mixture of magnesium hydroxide and water is known as milk of magnesia
Answers
because of its milk-like appearance. ... Since the dissociation of this small amount of dissolved magnesium hydroxide is complete, magnesium hydroxide is considered a strong electrolyte. Its low solubility makes it a weak base.
Carbon tetrafluoride, CF, contains four identical C-F bonds. Fluorine is more
electronegative than carbon. How will this impact each of the bonds between carbon and
fluorine?
a. The electrons in each C-F bond will be more attracted to the carbon atom.
b. The electrons in each C-F bond will be attracted equally to both atoms.
C. The electrons in each C-F bond will be more attracted to the fluorine atom.
d. The electrons in each C-F bond will separate easily.
Answers
Answer:
C. The electrons in each C-F bond will be more attracted to the fluorine atom.
MgCl2 (aq) + K2SO4 (aq) --> 2KCl (aq) + MgSO4 (s)
how many moles of potassium chloride are produced from 4.8 moles of magnesium chloride
Answers
Answer:
\(\boxed {\boxed {\sf 9.6 \ mol \ KCl}}\)
Explanation:
We must use stoichiometry to solve this, which is the calculation of reactants and products in a reaction using ratios.
Let's analyze the reaction given.
\(MgCl_2 _{(aq)} + K_2SO_4 _{(aq)} \rightarrow 2KCl _{(aq)} + MgSO_4 _{(s)}\)
Now, look at the coefficients, or numbers in front of the molecule formulas. If there isn't a coefficient, then a 1 is implied.
We want to find how many moles of potassium chloride (KCl) are produced from 4.8 moles of magnesium chloride (MgCl₂). Check the coefficients for these molecules.
MgCl₂: no coefficient= coefficient of 1 KCl: coefficient of 2The coefficient represents the number of moles. Therefore, 1 mole of magnesium chloride produces 2 moles of potassium chloride. We can set up a ratio using this information.
\(\frac { 1 \ mol \ MgCl_2} {2 \ mol \ KCl}\)
Multiply by the given number of moles of magnesium chloride: 4.8
\(4.8 \ mol \ MgCl_2 *\frac { 1 \ mol \ MgCl_2} {2 \ mol \ KCl}\)
Flip the ratio so the moles of magnesium chloride cancel out.
\(4.8 \ mol \ MgCl_2 *\frac {2 \ mol \ KCl} { 1 \ mol \ MgCl_2}\)
\(4.8 *\frac {2 \ mol \ KCl} { 1 \ } }\)
\(4.8 * {2 \ mol \ KCl}\)
\(9.6 \ mol \ KCl\)
9.6 moles of potassium chloride are produced from 4.8 moles of magnesium chloride.
What do the elements in group 18 have in common?
Answers
Answer: They are all odorless, colorless, monatomic gases with very low chemical reactivity.
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