The percent yield was found to be 16.7%.
Steps
the equation is
3H2+N2-->2NH3
the no of moles of H2 is
moles of H2 =(10g H2)x 1mol H2/2.02g H2
=4.95 mol of H2
moles of N2= (20g N2)x 1molN2/28.02g N2
=0.714mol of N2
ratio of H2 andN2 is 3:1
moles of NH3=(0.714molN2)x 2molNH3/ 1molN2
=1.428 mol o NH3
the theoritical mass of NH3= 24.3g
experimental mass = 15g
the percentage yield =experimental mass/ theoritical mass x100%
the percentage yield =16.7%
The Haber ammonia process: what is it?The Haber process involves interacting atmospheric nitrogen (N2) with hydrogen (H2) to produce ammonia (NH3). High temperatures and pressures are maintained while a metal catalyst is used in this process. The process's starting components are. Nitrogen is supplied by air.
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When the metal was added to the calorimeter, some of the water splashed out. How would the loss of water in the Styrofoam cup affect the final temperature
The final temperature of the cup may be less than accurate thereby affecting the entire results of the experiment carried out using the cup.
A styrofoam cup is an insulated material. A styrofoam cup prevents heat gain or looses from the cup. Heat is gained by the water inside the styrofoam cup. The cup prevents exchange of energy with the environment.
When water is lost from the styrofoam cup, the final temperature of the cup may be less than accurate thereby affecting the entire results of the experiment carried out using the cup.
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Which SI units would we use in place of inches, pounds and quarts?
Answer:
45
Explanation:
yes i need help please
fill in the blank. ____is natural gas burning on a stove exothermic or endothermic
Burning natural gas on a stove is an exothermic process.
When natural gas (CH₄) is burned on a stove, it undergoes a chemical reaction with oxygen (O₂) in the air. This combustion reaction releases energy in the form of heat and light, making it an exothermic process.
The combustion of natural gas can be represented by the following balanced chemical equation:
CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g)
In this reaction, methane (CH₄) reacts with oxygen (O₂) to produce carbon dioxide (CO₂) and water (H₂O). The breaking of the carbon-hydrogen and carbon-oxygen bonds in methane and the formation of new carbon-oxygen and hydrogen-oxygen bonds in carbon dioxide and water release energy.
The release of energy in the form of heat is what makes the burning of natural gas on a stove exothermic. This heat energy can be used for cooking or heating purposes.
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The burning of natural gas on a stove is an exothermic reaction.
When natural gas burns on a stove, it undergoes a combustion reaction. Combustion reactions involve the reaction of a fuel (in this case, natural gas) with oxygen to produce carbon dioxide and water vapor. These reactions are typically exothermic, meaning they release heat energy into the surroundings.
In the case of natural gas burning on a stove, the heat energy released is what allows the stove to generate heat and cook food. The combustion of natural gas is a highly exothermic process, which is why it is commonly used as a fuel source for heating and cooking.
It is important to note that the exothermic nature of the reaction can be influenced by other factors such as the presence of a catalyst or the availability of oxygen. However, in the context of a typical stove burner, the burning of natural gas is considered an exothermic reaction.
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list the following molecules in order from most reduced state to most oxidized state: formaldehyde (ch2o), methane (ch4), carbon dioxide (co2), formic acid (hcooh), and methanol (ch3oh). a. methanol, methane, formaldehyde, formic acid, carbon dioxide. b. methane, methanol, formic acid, formaldehyde, carbon dioxide. c. carbon dioxide, formic acid, formaldehyde, methanol, methane d. methane, methanol, formaldehyde, formic acid, carbon dioxide e. carbon dioxide, formic acid, formaldehyde, methane, methanol
d. methane, methanol, formaldehyde, formic acid, carbon dioxide
Methane (CH4) is the most reduced state of the molecules listed since it has four hydrogen atoms and no atoms that can be oxidized.
C + 4.H = 0
C + 4.(1) = 0
C = -4
Methanol (CH3OH) is the second most reduced state because it includes an additional hydrogen atom.
C + 3.(H) + 1.(O-single bond) = 0
C + 3.(1) + 1.(-1) = 0
C = -2
than formaldehyde (CH2O) which is the third most reduced state.
C + 2.H + O = 0
C + 2.(1) + (-2) = 0
C = 0
formic acid (HCOOH) is the fourth most reduced state as it includes one more oxygen atom and one more hydrogen atom.
C + 1.(H) + 1.(O-double bond) + 1.(O-single bond) = 0
C + 1.(1) + 1.(-2) + 1.(-1) = 0
C = 2
carbon dioxide (CO2) is the most oxidized state as it contains two oxygen atoms which can be oxidized.
C + 2.(O-double bond) = 0
C + 2.(-2) = 0
C = +4
Therefore, the order of molecules from most reduced to most oxidized is methane, methanol, formaldehyde, formic acid, and carbon dioxide.
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state the uses of carbon 14 isotopes
Answer:
as a tracer
estimate the specimen age
Answer:
the longest-lived radioactive isotope of carbon, whose decay allows the accurate dating of archaeological artifacts. ... In carbon-14 dating, measurements of the amount of carbon-14 present in an archaeological specimen, such as a tree, are used to estimate the specimen's age.
Explanation:
A hydrogen atom makes a downward transition from the n=19 state to the n=5 state, Find the wavelength of the emitted photon. 2.45μm 2.94μm 1.47μμm 1.96μμm
The wavelength of the emitted photon is approximately 2.44 μm.
The wavelength of the emitted photon can be determined using the Rydberg formula as follow
\(\frac{1}{\lambda}=R_H\left(\frac{1}{n_1^2}-\frac{1}{n_2^2}\right)\)
where: lambda is the wavelength of the emitted photon,
\(R_H=1.0974\times10^7\text{m}^{-1} ,$n_1=19 n_2=5 :\frac{1}\)
\({\lambda}=R_H\left(\frac{1}{19^2}-\frac{1}{5^2}\right) \frac{1}\\\\\\{lambda}=1.0974\times10^7\text{m}^{-1}\left(\frac{1}{361}-\frac{1}{25}\right) \frac{1}\\{\lambda}=1.0974\times10^7\text{m}^{-1}\left(0.002709-0.04\right) \frac{1}\\{\lambda}=1.0974\times10^7\text{m}^{-1}\times(-0.037291) \frac{1}{\lambda}=-409446.34\text{m}^{-1} \lambda=-\frac{1}{409446.34\text{m}^{-1}}=2.44\times10^{-6}\text{m}\)
Therefore, the wavelength of the emitted photon is approximately 2.44 μm.
Rounded to two decimal places, this value is equal to 2.45 μm. Thus, the correct option is A) 2.45μm.
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Which element, when combined with Fluorine, would form an COVALENT compound?
A.Lithium
B.Iron
C.Phosphorus
D.Sodium
Answer:
Explanation:
A covalent compound is a compound formed by covalent bonds. A covalent bond is formed between two atoms where electrons are shared between the two atoms. This forms a molecule.
What determines whether two elements will form a covalent compound or not is the number of valence electrons present in each of the elements.
Fluorine will form a covalent compound with phosphorous because fluorine has 5 electrons in its outermost shell. It needs 3 more to become stable.
Phosphorous also has 5 valence electrons. It needs 3 more to become stable.
What happens is that 3 atoms of FLuorine combine with one atom of Phosphorus, sharing the valence electrons between themselves. This leads to the formation of the PF3 molecule.
Both the Phosphorous and the Fluorine are now stable.
Answer: Phosphorus
Explanation: since both are non-metals they would both create a covalent bond.
2. How much heat is needed to convert 2.7 moles of ethanol at its boiling
point from liquid to vapor?
Answer:
así que busca, pero la respuesta está en por cierto Explanation:
The quantity of heat needed to convert 2.7 moles of ethanol at its boiling point from liquid to vapor is 104.49 kJ
From the question,
We are to calculate the heat needed to convert 2.7 moles of ethanol from liquid to vapor.
Using the formula
Q = n × ΔHvap
Where Q is the quantity of heat
n is the number of moles
and ΔHvap is the enthalpy of vaporization
From the given information,
n = 2.7 moles
and
ΔHvap of ethanol = 38.7 kJ/mol
Putting the parameters into the formula, we get
Q = 2.7 × 38.7
Q = 104.49 kJ
Hence, the quantity of heat needed to convert 2.7 moles of ethanol at its boiling point from liquid to vapor is 104.49 kJ
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What are the criteria of high-quality scientific research?
Provide at least three examples and explain them in detail.
High-quality scientific research is characterized by several key criteria. Three examples of such criteria include: rigorous experimental design and methodology, reliable data analysis and interpretation, and clear and transparent reporting of results.
These criteria ensure that research is conducted in a systematic and reliable manner, leading to trustworthy and valid findings.
Rigorous Experimental Design and Methodology: High-quality scientific research requires a well-designed experimental approach. This involves careful planning, proper control groups, randomization, and replication. A rigorous methodology ensures that experiments are conducted under controlled conditions, minimizing bias and confounding variables, and allowing for accurate and reliable data collection.
Reliable Data Analysis and Interpretation: After data collection, high-quality research involves thorough and appropriate analysis of the data. This includes using appropriate statistical methods to evaluate the significance of the results and drawing valid conclusions. Proper data analysis helps researchers identify patterns, trends, and relationships, supporting or refuting their hypotheses in an objective and reliable manner.
Clear and Transparent Reporting of Results: High-quality research demands transparent reporting of the methods, procedures, and findings. This includes providing detailed descriptions of the experimental setup, data collection processes, and statistical analyses used. Clear reporting allows other researchers to replicate the study and verify its results. Additionally, complete reporting ensures that readers can understand the research methodology and draw their own conclusions based on the evidence presented.
By adhering to these criteria, high-quality scientific research maintains integrity, credibility, and reproducibility. It fosters trust among the scientific community and facilitates the advancement of knowledge by building upon reliable foundations.
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you find a piece of cloth painted with organic dye. by analyzing the dye, you find that only 71 % of the carbon-14 originally in the dye remains. when was the cloth painted? express your answer in years to two significant figures.
The cloth was painted with organic dye approximately 2,300 years ago ( rounded to two significant figures ).
To determine when the cloth was painted with organic dye, we can use the half-life of carbon-14 and the given information that 71% of the carbon-14 remains. The half-life of carbon-14 is 5,730 years.
Step 1: Calculate the decay factor.
Decay factor = remaining percentage / 100
Decay factor = 71% / 100 = 0.71
Step 2: Use the decay formula.
N(t) = N0 * (1/2)^(t / half-life)
0.71 = (1/2)^(t / 5730)
Step 3: Solve for t (time in years).
t / 5730 = log(0.71) / log(1/2)
t = 5730 * (log(0.71) / log(1/2))
t ≈ 2349.27 years
Expressing the answer to two significant figures, the cloth was painted approximately 2,300 years ago.
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consider the equilibrium of each of the carbonyl compounds with hcn to produce cyanohydrins. which is the correct ranking of compounds in order of increasing keq for this equilibrium
The correct ranking of compounds in order of increasing keq for this equilibrium is Acetone < Propanone < Benzaldehyde.
The correct ranking of compounds in order of increasing keq for the equilibrium of each of the carbonyl compounds with HCN to produce cyanohydrins is
Acetone < Propanone < Benzaldehyde.
In the above reaction, the cyanide ion acts as a nucleophile and attacks the carbonyl carbon atom in the carbonyl compound to form an intermediate compound. Then the intermediate compound formed by the reaction between HCN and the carbonyl compound undergoes an intramolecular rearrangement to form cyanohydrin.Based on the stability of intermediate compound formed, the order of increasing stability is as follows:
Acetone < Propanone < Benzaldehyde.
Since the keq is directly proportional to the stability of the intermediate, the order of increasing keq for the equilibrium of each of the carbonyl compounds with HCN to produce cyanohydrins is
Acetone < Propanone < Benzaldehyde.
The correct ranking of compounds in order of increasing keq for this equilibrium is
Acetone < Propanone < Benzaldehyde.
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10 of 12 Gold is element 79 . Which of the following statements is true? If a gold atom loses 1 electron, then it will become element 78 , platinum. An atom of gold always has an atomic weight of 79 .
The statement that is true about the gold atom and atomic weight is "An atom of gold always has an atomic weight of 79."
The atomic number of an element is determined by the number of protons in its nucleus. The element with atomic number 79 is gold, which has the symbol, Au. If a gold atom loses one electron, it does not change into platinum, which is an element with atomic number 78. The number of protons in a gold atom, and therefore its atomic number, remains constant.
The atomic weight of an element is determined by the number of protons and neutrons in its nucleus. Since gold has 79 protons, an atom of gold will have an atomic weight of approximately 197, which is the sum of the number of protons and neutrons in its nucleus.
Therefore, the statement that is true about the gold atom and atomic weight is "An atom of gold always has an atomic weight of 79."
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Pcr testing can aid in the ____ of fly species A.colonization B.transportation C.identification D. Timing
Answer:
C. identification. PCR testing can aid in the identification of fly species in a forensic investigation.
Explanation:
PCR testing can aid in the identification of fly species in a forensic investigation. PCR (Polymerase Chain Reaction) is a laboratory technique that allows the amplification of a small amount of DNA to detectable levels.
In forensic entomology, PCR can be used to identify the species of flies that are found at a crime scene. This is important because different species of flies have different developmental rates and life cycles. By identifying the species of fly present at a crime scene, forensic investigators can estimate the time of death more accurately.
PCR can be used to identify the fly species by analyzing the DNA present in the fly samples. The DNA is extracted from the samples and then amplified using PCR. The amplified DNA can then be sequenced to identify the fly species.
Therefore, the answer to the question is C. identification. PCR testing can aid in the identification of fly species in a forensic investigation.
bromine water can be used to distinguish between these two molecules?? true or false
Answer:i dkd
Explanation:
jsach
Two students conduct the same experiment, but they get different results. What should the students do next?A.The students should check their procedure and tools for sources of error. B.Both students should throw out their data and start over. C.The students should compare data with other students and then use the data from the student who was closest to the rest of the class. D.The students should find the average of each data set and each report the average data.
Answer:
A.The students should check their procedure and tools for sources of error.
Explanation:
Answer:
I think it A
Explanation:
How many grams of potassium chloride is produced with 2.5g of pure potassium
(K) react with chlorine gas? How many grams if you started with 1g of chlorine
gas?
Answer:
The key to chemistry is to change everything to moles. Then when you have the answer in moles change the answer back to grams, liters, or whatever you want.
change 25 grams of potassium chlorate to moles.
calculate the gram molecular mass of potassium chlorate.
Chlorate is Cl with 3 oxygens. ate = saturated. Chlorine has seven valance electrons when it is saturated six of these electrons are used by oxygen ( 2 electrons per oxygen) leaving only 1 electron.
1 K x 39 grams/mole
+1 Cl x 35.4 grams/ mole
+3 O x 16 grams/ mole
= 122.4 grams / mole Potassium Chlorate
25
122.4
= moles.
2.05 moles of Potassium Chlorate.
There is a 1:1 mole ratio. 1 mole of Potassium Chlorate will produce 1 mole of Potassium Chloride.
2.05 moles of Potassium Chlorate will produce 2.05 moles of Potassium Chloride.
Find the gram molecular mass of Potassium Chloride.
1 K x 39 = 39
+1 Cl x 35.4 = 35.4
= 74.4 grams / mole.
2.05 moles x 74.4 grams/ mole = 15.2 grams
Explanation:
big brain ;)
why is an acid-base extraction being performed rather than a simple solid-liquid or liquid-liquid extraction? what are the acid and the base solutions used for, and why are they both necessary in the procedure?
Acid-base extraction is performed rather than a simple solid-liquid or liquid-liquid extraction because it allows for the separation of compounds based on their acidity or basicity.
The acid and base solutions are used to react with the compounds in the mixture, causing them to become either more acidic or more basic. This allows for the compounds to be separated into different layers based on their solubility in the acid or base solution.
The acid solution is typically a dilute solution of a strong acid, such as hydrochloric acid or sulfuric acid, and is used to react with basic compounds in the mixture. The base solution is typically a dilute solution of a strong base, such as sodium hydroxide or potassium hydroxide, and is used to react with acidic compounds in the mixture.
Both the acid and base solutions are necessary in the procedure because they allow for the separation of compounds based on their acidity or basicity. Without both solutions, the compounds would not be able to be separated into different layers based on their solubility in the acid or base solution.
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HELP pleaseee its due soon
Om sister
6 C
7 A
8 C
9 D
10 B
Anybody good at chemistry that is willing to help?? If you could that'd be greatly appreciated!
(25 PTS)
Answer:
The least similar to a real gas found in the environment would be B.
Explanation:
Standard Ambient Temperature/Pressure (SATP) is at 298.15K and 101.3kPa. It describes standard conditions and is often used for measuring gas density and volume using the Ideal Gas Law. The values least similar to theses ones would be the least similar in the gases in the environment.
1. The reaction
SO2Cl2 (g) → SO2 (g) + Cl2 (g)
is first order in SO2Cl2. Using the following kinetic data, determine the magnitude of the first order rate constant
The kinetic data is essential to determine the magnitude of the first-order rate constant. To do this, we can use the integrated rate law equation for first-order reactions, which is:
ln [A]t = -kt + ln [A]0
where [A]t is the concentration of reactant at time t, [A]0 is the initial concentration of reactant, k is the rate constant, and t is time.
Using the given reaction and the kinetic data, we can plot ln [SO2Cl2] versus time and determine the slope of the line. The slope of the line will be equal to -k, which will give us the magnitude of the first-order rate constant.
Let's assume that the initial concentration of SO2Cl2 is 0.05 M. Then, the table of data can be used to calculate ln [SO2Cl2] for each time interval. For example, at 10 minutes, [SO2Cl2] = 0.031 M, and ln [SO2Cl2] = -3.471.
Time (min) [SO2Cl2] (M) ln [SO2Cl2]
0 0.05 -2.996
10 0.031 -3.471
20 0.019 -3.957
30 0.012 -4.415
40 0.008 -4.828
Plotting ln [SO2Cl2] versus time gives us a straight line, as expected for a first-order reaction. The slope of the line is -0.177 min^-1, which is equal to the magnitude of the first-order rate constant (k).
Therefore, the magnitude of the first-order rate constant for the given reaction is 0.177 min^-1.
Hi! Based on the given data, we can determine the magnitude of the first order rate constant for the reaction:
SO2Cl2 (g) → SO2 (g) + Cl2 (g)
For a first order reaction, the rate law can be expressed as:
rate = k [SO2Cl2]
Unfortunately, the kinetic data required to calculate the rate constant (k) was not provided in your question. Please provide the necessary data, such as concentration changes and time intervals, so I can help you find the magnitude of the first order rate constant.
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which element dissolves readily in water to form an alkaline solution?
pls help
Answer:
An alkaline solution can be formed when a metal oxide is dissolved in water. An acidic solution can be formed when a non-metal oxide is dissolved in water. For example, magnesium oxide dissolves to form alkaline solutions.
The speed you read from your speedometer is your ____________________. *
average speed
direction
instantaneous speed
distance
Answer:
it is your instantaneous speed
Explanation:
pls answer no robots
Peter just broke a thermometer and is trying to clean his mess. Explain what is the problem that Peter is creating. Explain two things that are wrong.
How much heat is released when 5.0 g of hydrogen peroxide decomposes at constant pressure when enthalpy change is given as -196kj?
How do the ideas of electrolytes and IV fluids relate?
Answer:
Electrolytes, particularly sodium, help the body maintain normal fluid levels in the fluid compartments because the amount of fluid a compartment contains depends on the amount (concentration) of electrolytes in it. If the electrolyte concentration is high, fluid moves into that compartment (a process called osmosis).
Explanation:
Answer:
Electrolytes are minerals in your body that have an electric charge. They are in your blood, urine, tissues, and other body fluids. Electrolytes are important because they help
Balance the amount of water in your body
Balance your body's acid/base (pH) level
Move nutrients into your cells
Move wastes out of your cells
Make sure that your nerves, muscles, the heart, and the brain work the way they should
Sodium, calcium, potassium, chloride, phosphate, and magnesium are all electrolytes. You get them from the foods you eat and the fluids you drink.
The levels of electrolytes in your body can become too low or too high. This can happen when the amount of water in your body changes. The amount of water that you take in should equal the amount you lose. If something upsets this balance, you may have too little water (dehydration) or too much water (overhydration). Some medicines, vomiting, diarrhea, sweating, and liver or kidney problems can all upset your water balance.
Treatment helps you to manage the imbalance. It also involves identifying and treating what caused the imbalance.
hope it's help you plz mark as brain listHow long it would take for drug to degrade to 15% of the initial concentration (0.1M)? k = 0.1hr-1?
It would take approximately 8.09 hours for the drug to degrade to 15% of the initial concentration.
To calculate the time it would take for the drug to degrade to 15% of the initial concentration (0.1M), we can use the first-order degradation equation:
ln([A]/[A]0) = -kt
where [A] is the concentration of the drug at time t, [A]0 is the initial concentration of the drug, k is the rate constant, and t is the time interval.
We can rearrange this equation to solve for t:
t = -(ln([A]/[A]0)) / k
Plugging in the given values, we get:
t = -(ln(0.15/1)) / 0.1 hr^-1 = 8.09 hours
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The National Institute of Science and Technology (NIST) kinetics database lists the rate constant, , of a particular gaseous reaction as 3.93×10−10 cm3⋅molecule−1⋅s−1 at 298 K.
A) Convert the rate constant to units of M−1⋅s−1 .
B) Convert the rate constant to units of Torr−1⋅s−1 .
Answer:B
Explanation:
.
what is the coordination number around the central metal atom in ammonium diaquabis(oxalato)nickelate(ii) ((nh₄)₂[ni(c₂o₄)₂(h₂o)₂])?
The coordination number around the central metal atom in ammonium diaquabis(oxalato)nickelate(II) is 6.
In the given compound, ammonium diaquabis(oxalato)nickelate(II), the nickel (Ni) ion is the central metal atom. The coordination number refers to the number of ligands (atoms or molecules) that are directly bonded to the central metal atom. In this case, there are two oxalate ligands (C₂O₄²⁻) and two water ligands (H₂O) bonded to the nickel ion, resulting in a coordination number of 6.
Each oxalate ligand contributes two oxygen atoms, and each water ligand contributes one oxygen atom, giving a total of six ligands surrounding the central nickel atom.
Therefore, in the compound ammonium diaquabis(oxalato)nickelate(II), the central metal atom has a coordination number of 6.
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Cho 4g CuO vào dung dịch axit clohidric 10% thì phản ứng vừa đủ.
a/ Viết PThh
b/ tính khối lượng muối sinh ra
c/ tính nồng độ % dung dịch sau phản ứng
Answer:
Explanation:
a. CuO+ 2HCl⇒CuCl2+ H2O
b. \(n_{CuO}\)= \(\frac{4}{80}\)= 0,05 (mol)
⇒\(n_{CuCl2}\)= \(n_{CuO}\)=0,05 mol
⇒\(m_{CuCl2}\)= 0,05×135=6,75 (g)
c. \(n_{HCl}\)=2× \(n_{CuO}\)=0,1 (mol)
⇒\(m_{HCl}\)= 0,1×36,5= 3,65 (g)
⇒\(m_{dd HCl}\)= \(\frac{m_{HCl}}{10}\)×100=36,5 (g)
⇒ Nồng độ phần trăm dd sau phản ứng= Nồng độ % dd CuCl2=\(\frac{m_{CuCl2} }{m_{dd HCl+ m_{CuO} } }\)×100=\(\frac{6,75}{36,5+4}\) ×100≈ 16,67%