Answers
Answer:
Step 1: CCl4 + 2(HF) --> CCl2F2 + 2(HCl)
Step 2: CCl2F2: 121 g/mol CCl4: 154 g/mol
Step 3: 25.1 g
Step 4: 50.6%
Explanation:
Step 1: Write a balanced equation
The unbalanced form of the equation is just what the problem tells you in the beginning: Freon is synthesized from CCl4 with HF. HCl is also made as a byproduct. This means that our equation will be:
CCl4 + HF --> CCl2F2 + HCl
This equation is clearly unbalanced, as there are different numbers of atoms on either side.
Starting Atoms:
(The arrow shows what is on either side of the reaction arrow)
C: 1 --> 1
Cl: 4 --> 3
H: 1 --> 1
F: 1 --> 2
Let's first try adding a coefficient of 2 to HCl.
Coefficient One:
C: 1 --> 1
Cl: 4 --> 4
H: 1 --> 2
F: 1 --> 2
However, now the H (as well as the F) are out of balance on the left side of the arrow. Luckily, putting a coefficient of 2 in front of HF balances the equation completely.
Coefficient Two:
C: 1 --> 1
Cl: 4 --> 4
H: 2 --> 2
F: 2 --> 2
This means that the balanced equation is:
CCl4 + 2(HF) --> CCl2F2 + 2(HCl)
Step 2: Calculate the Molar Masses
To find the molar masses, we simply add up all of the individual atomic masses.
CCl2F2: (12.0)+2(35.5)+2(19.0) = 121 g/mol
CCl4: (12.0)+4(35.5) = 154 g/mol
Step 3: Calculate the Theoretical Yield in Grams
We can now put together the previous steps. You typically need to figure out which molecule is the limiting reactant, but as they have only given you one initial mass, we can assume that CCl4 will be the LR. Essentially, the next step is to do several conversions to turn this reactant gram value into a product value. We will go from g of reactant to moles of reactant (using its molar mass), then to moles of product (with the balanced equation), and finally, to grams of product (using the other molar mass):
[tex]\frac{31.9g}{1} *\frac{1molCCl4}{154g} *\frac{1molproduct}{1molCCl4} *\frac{121g}{1molproduct}=25.1g[/tex]
This results in 25.1 g of product as our theoretical yield. This amount is the absolute maximum amount of product that could possibly be made from the amount of starting materials that we put in.
Step 4: Calculate the Percent Yield
This is probably the easiest step. All we have to do is use the following equation, and we will have our answer:
[tex](\frac{created}{expected})*100=yield[/tex]
The created value is what is given in the problem itself: 12.7 g
The expected amount is our theoretical yield value that we just calculated: 25.1 g
Substituting this into the equation, our percent yield is just over half at about 50.6%. Keep in mind that a yield of 100% is just about impossible due to human error, things being left on glassware, etc.
Related Questions
which set of elements have chemical properties similar to carbon
Answers
Element Si, Ge, Sn, Pb have similar properties to carbon.
Reasons:
They all belong to same group i.e. group 14All elements have valency four.The electronic configuration of all elements is similar i.e. nS² nP²Thanks for joining brainly community!
What is kwestrong? I- ready reading
Answers
Kwestrong is an Ojibwe event in which women of all ages run, bike and canoe to test their strength and endurance.
What is Kwestrong?Kwestrong is an Ojibwe event that means "strong woman." It is an organization formed by Native women that fosters companionship while also building strength and endurance.
Kwestrong goal is about Native Women empowering and motivating one another to achieve their own fitness goals.
Therefore, we can conclude that, Kwestrong is an Ojibwe event in which women of all ages run, bike and canoe to test their strength and endurance.
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When 200.0 mL of a 0.125 M sodium hydroxide is combined with 400.0 mL of a 0.025 M solution of magnesium nitrate, what is the percent yield if 0.45 g of precipitate is isolated?
Answers
Answer:
Explanation:
Balanced equation :
2NaOH (aq) + Mg(NO3)2 (aq) → Mg(OH)2(s) + 2NaNO3(aq)
2 mole NaOH reacts with 1 mole Mg(NO3)2 to produce 1 mole Mg(OH)2.
Check for limiting reactant :
Mol NaOH in 200.0 mL of 0.125 M solution
Mol = 0.125 mol/L * 200 mL / 1000 mL/L = 0.025 mol
This will react with 0.025 / 2 = 0.0125 mol Mg(NO3)2
Mol Mg(NO3)2 in 400 mL of 0.025 M solution
= 400 mL / 1000 mL/L * 0.025 mol /L = 0.01 mol Mg(NO3)2
The NaOH is in excess and the limiting reactant is Mg(NO3)2
0.01 mol Mg(NO3)2 will produce 0.01 mol Mg(OH)2
Molar mass Mg(OH)2 = 58.32 g/mol
Mass of 0.01 mol Mg(OH)2 = 0.01mol * 58.32 g/mol = 0.5832 g
Product isolated was 0.45 g
Percent yield = Product / Reactant * 100%
= 0.45 / 0.5832 * 100%
= 77.16% yield.
Write a statement explaining your claim about which experimental setup will dissolve 100 g of
sugar in 1 liter of water at the fastest rate. Next, provide evidence to support your claim about
which setup will result in the fastest rate. Finally, provide reasoning that connects your evidence
to your claim.
Answers
Set up A will dissolve the 100g of sugar fastest in 1 L of water due to the inclusion of physical agitation in the form of stirring.
Dissolution of a solid?We have to note that energy and sometimes physical agitation are necessary in order to dissolve a solid in a liquid. In this case, we want to dissolve sugar in water.
Set up A in which the temperature is raised to 80 degrees with agitation will dissolve the 100g of sugar fastest in 1 L of water due to the inclusion of physical agitation in the form of stirring.
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A 35.3 g of element M is reacted with nitrogen to produce 43.5 g of compound M3N2. What is (i) the molar mass of the element and (ii) name of the element?
Answers
This problem is providing us with the mass of an unknown element which produces 43.5 g of M3N2. Thus, its name and molar mass are required and found to be 4.02 g/mol and calcium nitride after the following:
Stoichiometry.In chemistry, stoichiometry is a tool used for the calculation of masses or moles involved in chemical reactions, by the utilization of molar masses and mole ratios based on proportional factors.
In such a way, for the given reaction, one can use the formulas to write the following balanced chemical equation:
[tex]3M+N_2\rightarrow M_3N_2[/tex]
Where there is a 3:1 mole ratio of the metal to the product, which means we can use the following stoichiometric setup:
[tex]35.3gM*\frac{1molM}{x}*\frac{1molM_3N_2}{3molM} *\frac{(3x+14.01*2)gM_3N_2}{1molM_3N_2}=43.5gM_3N_2[/tex]
Now, by using the numbers only, one will be able to calculate x as the atomic mass of the element M in g/mol:
[tex]35.3*\frac{1}{x}*\frac{1}{3} *\frac{3x+14.01*2}{1}=43.5\\\\\frac{105.9x+989.106}{3x}=43.5\\ \\105.9x+989.106=130.5x\\\\989.106=130.5x-105.9x\\\\x=\frac{989.106}{130.5-105.9} =40.2g/mol[/tex]
Which matches with the molar mass of calcium. Moreover, we find its name as calcium nitride.
Learn more about stoichiometry: brainly.com/question/9743981
discuss whether glucose is a mixture of water and carbon dioxide or is it a new compound?
Answers
Answer:
SEE BELOW
Explanation:
Glucose (C6H12O6) is an organic compound composed of the elements carbon, hydrogen and oxygen.
A hot metal plate at 150°C has been placed in air at room temperature. Which event would most likely take place over the next few minutes?
Molecules in both the metal and the surrounding air will start moving at lower speeds. Molecules in both the metal and the surrounding air will start moving at higher speeds. The air molecules that are surrounding the metal will slow down, and the molecules in the metal will speed up.
The air molecules that are surrounding the metal will speed up, and the molecules in the metal will slow down.
Answers
Abby feeds her dog one and a half cups of food each day and Braxton feed his dog for out of goon
Answers
Braxtons dog eats 3 times more than Abbys
Answer:
Braxton's dog eats 3 times more food.
Explanation:
Helpppp helpppp plsssss
A volume v =40ml of distilled water is added to volume vi =10ml of sugar_water solution of concentration ci=0.3mol.L-1
1) calculate the concentration cf of obtained solution
2) deduce the number or factor of dilution?
Answers
[tex]\Large \text{1)}[/tex]
[tex]\textbf{Use the formula and substitute the values}[/tex]
[tex]\displaystyle 0.3\ mol/L = \frac{n \ mol}{10 \times 10^{-3}\ L}[/tex]
[tex]\textbf{Solve for the number of moles}[/tex]
[tex]n = 0.003\ mol[/tex]
[tex]\textbf{Calculate final volume }[/tex]
[tex]40+10=50\ mL[/tex]
[tex]\textbf{Number of moles remains same. Solve for concentration}[/tex]
[tex]\displaystyle C=\frac{0.003\ mol}{50 \times 10^{-3}\ L} =0.06\ mol/L[/tex]
[tex]\Large \text{2)}[/tex]
[tex]\displaystyle DF=\frac{V_f}{V_i}[/tex]
[tex]\displaystyle DF=\frac{50}{10}=5[/tex]
Balance the following chemical equation (if necessary):
Answers
Answer:
1 [tex]C_{3}H_{6}O_{2}[/tex] (g) + 6 [tex]O_{2}[/tex] (g) → 3 [tex]H_{2}O[/tex] (g) + 3 [tex]CO_{2}[/tex] (g)
A 35.3 g of element M is reacted with nitrogen to produce 43.5 g of compound M3N2 What is (i) the molar mass of the element and (ii) name of the element?
Answers
This problem is providing us with the mass of an unknown element which produces 43.5 g of M3N2. Thus, its name and molar mass are required and found to be 4.02 g/mol and calcium nitride after the following:
Stoichiometry.In chemistry, stoichiometry is a tool used for the calculation of masses or moles involved in chemical reactions, by the utilization of molar masses and mole ratios based on proportional factors.
In such a way, for the given reaction, one can use the formulas to write the following balanced chemical equation:
[tex]3M+N_2\rightarrow M_3N_2[/tex]
Where there is a 3:1 mole ratio of the metal to the product, which means we can use the following stoichiometric setup:
[tex]35.3gM*\frac{1molM}{x}*\frac{1molM_3N_2}{3molM} *\frac{(3x+14.01*2)gM_3N_2}{1molM_3N_2}=43.5gM_3N_2[/tex]
Now, by using the numbers only, one will be able to calculate x as the atomic mass of the element M in g/mol:
[tex]35.3*\frac{1}{x}*\frac{1}{3} *\frac{3x+14.01*2}{1}=43.5\\\\\frac{105.9x+989.106}{3x}=43.5\\ \\105.9x+989.106=130.5x\\\\989.106=130.5x-105.9x\\\\x=\frac{989.106}{130.5-105.9} =40.2g/mol[/tex]
Which matches with the molar mass of calcium. Moreover, we find its name as calcium nitride.
Learn more about stoichiometry: brainly.com/question/9743981
how do carbon and silicon differ with regard to the types of orbital available for hybridization?
Answers
What is the average mass (in grams) of a single chlorine dioxide molecule?
Answers
Answer:
35.5 is the answer
Explanation:
pls mark me brainlest
Why did humans overhunt the Caribbean monk seal to extinction?
Question 3 options:
for their fur
for their blubber
for their bones
for their flippers
Answers
Answer:
for their fur
Explanation:
because the body is hunt
Sunlight, wind, and water are considered ____resources.
Question 3 options:
renewable
nonliving
fossil
nonrenewable
Answers
Sunlight, wind, and water are considered renewable resources
When the volume of a gas is changed from 11.5 cm3 to __ cm3, the temperature will change from 415.0 K to 200.0 K
Answers
Answer:
Explanation:
Charles Law: The volume of and ideal gas is directly proportional to the temperature when the pressure is kept constant
V₁ - initial Volume = 11.5 cm³ ; T₁ = Initial temperature = 415 K ;
V₂ - final volume ;T₂ =final temperature = 200 K
[tex]\dfrac{V_{1}}{T_{1}}=\dfrac{V_{2}}{T_{2}}\\\\\\\dfrac{11.5}{415}=\dfrac{V_{2}}{200}\\\\\\\dfrac{11.5}{415}*200=V_{2}\\\\\\V_{2}=5.5 \ cm^{3}[/tex]
If we have 2 L of oxygen in a jar and 2 L of hydrogen in another jar at STP. Number of molecules
A. of oxygen is greater than hydrogen
B. of oxygen is smaller than hydrogen.
C. are equal in both Jars.
Answers
Explain how temperature and air pressure play a role in creating wind.
Answers
How temperature and air pressure play a role in creating wind.
Gases move from high-pressure areas to low-pressure areas. And the bigger the difference between the pressures, the faster the air will move from the high to the low pressure. That rush of air is the wind we experience.
hope it helps.
Aliyyah.
Winds are created by the change in temperature gradient which results in the difference in pressure causes the circulation of air from high pressure area to low pressure area that is called winds.
What is winds?Wind is the circulation or passage of air from one region to the other over a pressure gradient. The pressure gradient is resulting from the uneven heating of the atmosphere.
According to Gay- Lussac's law, the pressure of a gas is directly proportional to the temperature of the region. Thus as the temperature over an area increases pressure also increases.
The heat radiated from the sun is unevenly distributed in the earth atmosphere results in difference in pressure also. To balance this pressure difference, the air from high pressure region passes to low pressure region creating the winds.
To find more on winds, refer here:
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Nitrogen gas at 20. °C in a balloon has a volume of 3.0 L and pressure of 1.5 atm. If the temperature of the balloon is increased to 30. °C and the pressure to 2.5 atm, what is the new volume of the balloon?
Answers
Answer:
In all the problems below, the pressure and the amount of gas are held constant. Problem #1: Calculate the decrease in temperature (in Celsius) when 2.00 L at 21.0 °C is compressed to 1.00 L. Converting 147.0 K to Celsius, we find -126.0 °C, for a total decrease of 147.0 °C, from 21.0 °C to -126.0 °C.
Answer:
1.9L
Explanation:
edg 2023 chemistry A
If 4.5 kJ of energy is added to 100 g of copper at 100ºC, what is the final temperature in degrees Celsius?
Answers
Answer:
215 [C°].
Explanation:
1) if the given energy is Q, the initial temperature is t₀, the final temperature is t, then
2) Q=cm(t-t₀);
[tex]t=\frac{Q}{cm}+t_0;[/tex]
3) according to the formula above:
[tex]t=\frac{4500}{0.39*100}+100=215.[/tex]
A certain sample of calcium carbonate contains 4.68 moles. what is the mass of the CO3 ions present?
Answers
The general trend in the graph shows an increase in atmospheric carbon dioxide levels from 2002 to 2006.
Describe one human activity that may have produced this increase.
Answers
Answer:
dioxide levels from 2002 to 2006.
Explanation:
When the volume of a gas is changed from 1146 mL to 765 mL, the temperature will change from __ K to 640 K
Answers
Answer:
Explanation:
According to Charles rule,
[tex]\dfrac{V_{1}}{T_{1}}=\dfrac{V_{2}}{T_{2}}[/tex]
V₁ = initial volume = 1145 mL
V₂ = final volume = 765 mL & T₂ = final temperature = 640 K
[tex]\dfrac{1145}{T_{2}}=\dfrac{765}{640}\\\\\\Cross \multiply\\\\1145*640=T_{2}*765\\\\\dfrac{1145*640}{765}=T_{2}\\\\T_{2} = 957.9 \ K[/tex]
At the same temperature, which of the following gases will have fastest rate of effusion?
-CO
-SF6
-Cl2
-HBr
Answers
According to Graham's law, CO, with the lowest molar mass, will have the fastest rate of effusion.
What is effusion?In physics and chemistry, effusion is the process in which a gas escapes from a container through a hole of diameter considerably smaller than the mean free path of the molecules.
According to Graham's law, the rate of effusion (r) is inversely proportional to the square root of the molar mass (M) of the gas.
r ∝ 1/√M
We have the following gases with the respective molar masses.
CO (28.01 g/mol)SF₆ (146.05 g/mol)Cl₂ (70.90 g/mol)HBr (80.91 g/mol)According to Graham's law, CO, with the lowest molar mass, will have the fastest rate of effusion.
Learn more about effusion here: https://brainly.com/question/2097955
in case you know the solution ~
kindly don't spam !
[tex]\\[/tex]
Answers
Answer: -1323 kJ mol^-1
Explanation:
[tex]\begin{aligned}&\mathrm{C}_{2} \mathrm{H}_{4(\mathrm{~g})}+3 \mathrm{O}_{2(g)} \longrightarrow 2 \mathrm{CO}_{2(g)}+2 \mathrm{H}_{2} \mathrm{O}_{(1)} \quad \Delta \mathrm{H}=? \\&\Delta \mathrm{H}=\left(\sum \Delta \mathrm{Hf} \text { products }\right)-\left(\sum \Delta \mathrm{Hf} \text { Reac tan ts }\right) \\&\Rightarrow[(2 \times-393.7)+(2 \times-241.8)]-[(52.3+0)] \\&\Rightarrow[-787.4 - 483.6]-52 \\&\Rightarrow-1323 \mathrm{~kJ} \mathrm{~mol}^{-1}\end{aligned}[/tex]
The enthalpy of combustion for the burning of ethylene is -1323.33 kJ/mol
What is combustion?The term combustion has to do with the burning of a particular substance in oxygen. In this case, the equation of the reaction is;
C2H4 + 3O2 ----->2CO2 + 2H2O
The enthalpy of combustion can be obtained from the relation;
ΔH rxn = [(2(-393.7) + 2(-241.8)] - [(52.3 + 3(0)]
ΔH rxn = (-787.4) + (-483.6) - 52.3
ΔH rxn = -1323.33 kJ/mol
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If the energy of a photon is [tex]3.34[/tex]×[tex]10^{-20}[/tex] J, what is the wavelength of that light?
Answers
Answer:
thats what I know please check if it's correctI don't really think what this question about
Answers
Answer:
A single time the hail stone was drafted up and down in the atmosphere
Explanation:
The SI unit of pressure is the _______.
Answers
In one to two sentences, explain why metal is often used for making wire and the properties that make metal useful. (Will give 15 points for answer:,))
Answers
Answer:
Metal is used in the making of wire because of its high conductivity. Metals are also ductile, so the making of wire is easy with metal.
How does an atom become a positively charged lon?
A. by gaining one or more electrons
B. by gaining one or more neutrons
C. by losing one or more electrons
D. by losing one or more neutrons
Answers
Answer:
by losing one or more electrons*