Answers
Explanation:
28.1 g of Sb₄O₆ are reacting with an excess of C to give 17.3 g of Sb and CO. The unbalanced reaction between these compounds is:
__ Sb₄O₆ + __ C ----> __ Sb + __ CO
We have 4 atoms of Sb on the left and just one on the right. The coefficient for Sb must have 4. Also we have 6 atoms of O on the left and just one on the right side of the equation. So the coefficient for CO must be 6.
__ Sb₄O₆ + __ C ----> 4 Sb + 6 CO
All the elements are balanced except from the C. We have 6 atoms on the right side and just one on the left. The coefficient for C must be 6. The balanced equation is:
Sb₄O₆ + 6 C ----> 4 Sb + 6 CO
To find the percent yield we will have to find the theoretical yield, the mass of Sb that should theoretically be produced when 28.1 g of Sb₄O₆ are reacting with excess of C.
First we have to convert 28.1 g of Sb₄O₆ to moles using the molar mass of Sb₄O₆.
molar mass of Sb = 121.76 g/mol
molar mass of O = 16.00 g/mol
molar mass of Sb₄O₆ = 4 * 121.76 g/mol + 6 * 16.00 g/mol
molar mass of Sb₄O₆ = 583.04 g/mol
mass of Sb₄O₆ = 28.1 g
moles of Sb₄O₆ = 28.1 g * 1 mol/(583.04 g)
moles of Sb₄O₆ = 0.0482 moles
Once we know the moles of Sb₄O₆ we can find the moles of Sb produced.
Sb₄O₆ + 6 C ----> 4 Sb + 6 CO
According to the coefficients of the reaction 1 mol of Sb₄O₆ reacting with an excess of C will produce 4 moles of Sb. Then the molar ratio between Sb₄O₆ and Sb is 1 to 4. We can use that relationship to find the number of moles of Sb that are produced in our exercise.
1 mol of Sb₄O₆ = 4 moles of Sb
moles of Sb = 0.0482 moles of Sb₄O₆ * 4 moles of Sb/(1 mol of Sb₄O₆)
moles of Sb = 0.193 moles
To find the theoretical yield we still have to convert these moles into grams using the molar mass of Sb.
molar mass of Sb = 121.76 g/mol
mass of Sb = 0.193 moles * 121.76 g/mol
mass of Sb = 23.5 g = theoretical yield
And finally we can find the % yield for our reaction.
actual yield = 17.3 g
% yield = actual yield/theoretical yield * 100
% yield = 17.3 g/23.5 g * 100
% yield = 73.6 %
Answer: The percent yield for the reaction is 73.6 %.
Related Questions
Which statement is always true about a reversible chemical reaction?
Answers
Answer:
It is a chemical reaction in which the reactants form products and products react together to give reactants back. That means reversible reactions can go in both directions forward as well as backward direction.
What mass of salt would you need to add to 1.00kg of water to achieve a freezing point of -5 degrees C
Answers
Answer:
The type of salt to be added to the water is not known from the question but no worries, I will try to give you the step by step procedure to answer any type of question similar to this.
To answer this question, we should know some facts.
1. the molar freezing point depression constant of water (Kf) = 1.86 K kg/mol
2. the molar mass of the salt if NaCl = 58.5 g/mol ; KCl = 74.5 g/mol
3. since the salt can dissociate if NaCl or KCl into two ions, the Van't Hoff factor ( i )= 2
Note that: the change in freezing point, molarity, deepression constant and van't Hoff factor are related by this formula;
ΔTf = i Kf m
So lets take NaCl as the salt:
Molar mass = 58.5 g/mol
Van't Hoff factor = 2
1. calculate the number of moles
So we can calculate the molarity of the salt NaCl from the formula;
m = ΔTf / i Kf
m = 5 / 2 * 1.86
m = 5 / 3.72
m = 1.344 mol/kg
2. calculate the number of moles of the salt required
Next is to multiply the molarity by the mass of water. Density of water = 1kg/L
number of moles = 1.344 mol/kg * 1 Kg/L * 1 kg water
number of moles = 1.344 moles.
3. calculate the mass of the salt.
numner of moles = mass / molar mass
mass = number of moles * molar mass
mass = 1.344 * 58.5
mass = 78.624 g of NaCl salt.
You can follow these steps to solve for the type of salt you are given in the question.
If surface area is increased (I.e solid to powder) does that mean more particles will have Kinetic energy greater than or equal to activation energy(reaction rate question)?
Answers
Answer:
\(Yes\)Explanation;
For a reaction to take place. A collision must occur. Although several collisions can occur, only collisions with kinetic energy greater than or equal to activation energy can lead to a reaction. This is termed an effective collision
By increasing the surface area, more particles are exposed and can undergo collision for a reaction to take place. Hence, when the surface area is increased, there is an increase in the particle surface that can collide which can lead to an effective collision that results in a chemical reaction
Which statement best describes heating by conduction?
1. Sunlight travels through space without the aid of fluids or solids.
2. Air at the equator rises and sinks at the poles.
3. Air molecules touch the warm ground, heating them up.
4. Warm air rises and takes heat with it; eventually it cools and sinks.
(If you want brainliest please explain why the answer is that answer)
Answers
Answer:
It would be A. Air molecules touch the warm ground, Heating them up because conduction is when a source of energy touches something directly.
Answer:
3. Air molecules touch the warm ground, heating them up.
Explanation:
Aqueous hydrochloric acid will react with solid sodium hydroxide to produce aqueous sodium chloride and liquid water . Suppose 14. g of hydrochloric acid is mixed with 6.55 g of sodium hydroxide. Calculate the minimum mass of hydrochloric acid that could be left over by the chemical reaction. Round your answer to significant digits.
Answers
Answer:
8.02 g of HCl could be left over by the chemical reaction
Explanation:
We propose the reaction:
HCl(aq) + NaOH (s) → NaCl (aq) + H₂O (l)
Ratio is 1:1. First of all, we determine the moles of reactants:
14 g . 1mol / 36.45g = 0.384 mol of acid
6.55 g. 1mol / 40g = 0.164 mol of base
If a determined mass of HCl, could be left; this means that the acid is the excess reagent.
For 0.164 moles of NaOH, we need 0.164 moles of HCl.
As we have 0.384 moles, (0.384 - 0.164) = 0.220 moles of acid are left over in the reaction. We convert the moles to mass:
0.220 mol . 36.45 g /1mol = 8.02 g
Consider the structure of chloride ion. Draw the conjugate acid for chloride ion. Remember to include charges and non-bonding electrons where necessary. Select Draw Rings More Erase H CI C17
Answers
The chloride ion (Cl-) has a single negative charge and a full octet of electrons in its outermost shell. It has a tetrahedral shape, with three equatorial lone pairs and one axial bond to a hydrogen or other positively charged ion.
The conjugate acid of chloride ion is HCl (hydrogen chloride), which is formed when the chloride ion accepts a proton (H+) from an acid. The resulting molecule has a positive charge and a linear shape, with a single bond between the hydrogen and chlorine atoms.
The conjugate acid of chloride ion, HCl, is a strong acid that readily donates a proton (H+) to a base to form the chloride ion. In water, HCl dissociates completely to form H+ and Cl- ions. The hydrogen ion (H+) has a positive charge and no electrons, while the chloride ion (Cl-) retains its original tetrahedral shape and three lone pairs of electrons.
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Write a balanced nuclear equation for the β emission of the following isotopes
92
Sr
38
Answers
The balanced nuclear equation for the β emission of the following isotopes is seen below:
92 92 0
Sr ⇒ Y + e
38 39 -1
What is Beta emission?
This is also known as beta decay in which a beta ray is emitted from an atomic nucleus.
The element formed during the beta emission of strontium is referred to as Yttrium.
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the color of an object that absorbs all colors except red
Answers
Answer:
The color black absorbs most colors, while white reflects most colors.
two uses of sodium carbonate
Answers
Sodium carbonate, also known as washing soda or soda ash, has a wide range of applications. Sodium carbonate can be naturally occurring or synthetically produced through various methods, including the Solvay process, which is the most common method of industrial production.
Sodium carbonate, also known as washing soda or soda ash, has many uses, including:
1) Cleaning agent: Sodium carbonate is an effective cleaning agent due to its alkaline nature. It is used in laundry detergents and household cleaners to remove stains and grease from clothes and surfaces.
2) Industrial applications: Sodium carbonate is used in a variety of industrial applications. It is used in the production of glass, pulp and paper, and soaps and detergents. It is also used as a water softener and pH regulator in chemical processes.
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Rough ER is connected to the nucleus membrane and to
Answers
Rough ER is connected to the nuclear membrane and is responsible for the synthesis and processing of proteins.
The rough endoplasmic reticulum (ER) is a network of membrane-bound sacs and tubules that is studded with ribosomes on its surface. These ribosomes are responsible for protein synthesis. The rough ER is connected to the nuclear membrane because it receives instructions for protein synthesis from the DNA in the nucleus. This connection allows for the efficient transfer of genetic information from the nucleus to the rough ER.
Once the ribosomes on the rough ER synthesize proteins, the rough ER is also involved in the processing and modification of these proteins. It helps in folding the newly synthesized proteins into their functional three-dimensional shapes and also adds various modifications such as glycosylation (the addition of sugar molecules) or signal sequences that target the proteins to specific locations within or outside the cell.
After processing, the proteins may be transported to other parts of the cell or exported to the cell membrane or extracellular space. The connection between the rough ER and the nuclear membrane ensures a coordinated flow of genetic information and protein synthesis, allowing the cell to efficiently carry out its functions.
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Which rock type is an example of igneous glass?
1. lava
2, gabbro
PLS HURRY
3. obsidian
4. rhyolite
Answers
Answer:
obsidian
Explanation:
because it is an igneous rock which is smooth
Answer:
B) Obsidian
Explanation:
Since the igneous glass last not very long like you could say obsidian compared to normal ones.
What quantity in moles of HCl are there in 35.0 mL of 0.350 M HCl?
Answers
Answer:
0.0123 moles
Explanation:
Concentration = Moles / Volume of solution
or you can rearrange the formula to get
Moles = concentration (moles/liter) x volume of solution (liter)
First convert your volume to L instead of mL. 35mL = 0.035L
moles = 0.350 moles/liter x 0.035 liter (liters cancel out)
moles = 0.0123
Suppose that an aspartic acid (aspartate) residue in the active site of an enzyme was mutated to alanine. As expected, the alanine mutant was inactive, suggesting that the aspartic residue was critical to the catalytic mechanism. Which mutation is most likely to restore wild-type level of activity to the alanine mutant?
a. A to Y
b. A to E
c. A to L
d. A to M
e. A to K
Answers
Answer:
b. A to E
Explanation:
The aspartic acid (aspartate) residue in the active site of the enzyme is likely critical to the catalytic mechanism because it is a charged amino acid and can participate in ionic interactions that stabilize the transition state of the catalyzed reaction. Since the alanine mutant is inactive, we need to introduce a charged amino acid at this position to restore the activity.
Out of the options given, the mutation that is most likely to restore the wild-type level of activity to the alanine mutant is (b) A to E. The glutamic acid (glutamate) amino acid is similar to aspartic acid in its chemical properties, as both are negatively charged amino acids. Therefore, introducing a glutamic acid residue at the mutated position is likely to restore the ionic interaction necessary for catalytic activity.
How many moles of nitrogen gas are produced when 36. 0 g of NH4NO3 reacts?
Answers
\(0.225 moles\) of nitrogen gas are produced when\(36.0 g\) of NH4NO3 reacts.
The reaction for the decomposition of ammonia nitrate (NH4NO3) is given by:
NH4NO3 → N2 + 2H2O
The number of moles of nitrogen gas (N2) produced when 36.0 g of NH4NO3 reacts can be determined using the following steps:
1. Calculate the molar mass of NH4NO3.
\(Molar mass of NH4NO3 = (1 *14.007 g/mol) + (4 *1.008 g/mol) + (3 * 14.007 g/mol) \\ = 80.042 g/mol\)
2. Calculate the number of moles of NH4NO3 present in the given mass.
Number of moles =\(\farc{Mass}{Molar mass}\\ = \frac{36.0 g}{80.042 g/mol}\\ = 0.45 moles\)
3. Calculate the number of moles of nitrogen gas produced.
Number of moles of N2 produced = \(\frac{0.45 moles}{2 }= 0.225 moles\)
Therefore,36.0 g of NH4NO3 react with oxygen to generate g of nitrogen gas \(0.225 moles\).
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What is the mole ratio between H2O and O2
Answers
Answer is 2:1
he unknown solution is prepared by mixing CaCO3(s) and HCl(aq). The H2CO3 produced in this reaction decomposes to CO2 (g) and H2O. Write the complete chemical equation for this reaction, indicating the state of each species. If ionic compounds dissociate, separate the ions in the equation.
Answers
Answer:
CaCO₃(s) + 2 H⁺(aq) + 2 Cl⁻(aq) ⇒ Ca²⁺(aq) + 2 Cl⁻(aq) + H₂O(l) + CO₂(g)
Explanation:
Let's consider the molecular equation that occurs when CaCO₃(s) reacts with HCl(aq).
CaCO₃(s) + 2 HCl(aq) ⇒ CaCl₂(aq) + H₂O(l) + CO₂(g)
The complete ionic equation includes all the ions and the compounds that do not dissociate in water.
CaCO₃(s) + 2 H⁺(aq) + 2 Cl⁻(aq) ⇒ Ca²⁺(aq) + 2 Cl⁻(aq) + H₂O(l) + CO₂(g)
The United States experienced a decrease in the real GDP, high inflation, and a
rising unemployment rate. The United States
was in the middle of an economic boom
appeared to be entering a recession
was in an economic slump
was in a stagnant economic period
Answers
The United States experienced a decrease in the real GDP, high inflation, and arising unemployment rate.
The United States appeared to be entering a recession.A recession is a decline in economic activity, characterized by declining GDP, high unemployment rates, and increased unemployment benefits. Economic analysts and the media commonly use a two-quarter consecutive decline in real GDP as a definition of a recession.
The United States is considered to have entered a recession in the 1970s, which was characterized by an energy crisis, inflation, and recession. However, by the end of the decade, the economy had improved, and it entered into the 1980s with a strong economic performance.
The 1970s were a period of high inflation, low growth, and an oil crisis, which had a significant impact on the United States economy. Therefore, it can be concluded that The United States was in the middle of an economic boom before the 1970s recession and entered a recession in the 1970s due to a decrease in the real GDP, high inflation, and arising unemployment rate.
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How many moles of gas does it take to occupy 150 L at a pressure of 4.2 atm and a temperature of 389 K?
Answers
Moles of gas=19.75
Further explanationThe gas equation can be written
\(\large {\boxed {\bold {PV = nRT}}}\)
where
P = pressure, atm
V = volume, liter
n = number of moles
R = gas constant = 0.08206 L.atm / mol K
T = temperature, Kelvin
V=150 L
P=4.2 atm
T=389 K
\(\tt n=\dfrac{PV}{RT}\\\\n=\dfrac{4.2\times 150}{0.082\times 389}\\\\n=19.75\)
Consider the following equilibrium reaction having gaseous reactants and products.4HCl + O2 ⇌ 2H2O + Cl2Which of the following would result from increasing the volume of hydrochloric acid?
Answers
According to what is known about chemical equilibrium and Le Chatelier's principle, when you increase the amount of the reactants, the reaction will be moved to the products, this is because, the most reactants we have the most products we can produce.
From the given choices, the one that goes according to this reason is the third one: The volume of water vapor increases.
Dichloroethylene (C2H2Cl2) has three forms (isomers), each of which is a different substance.
Part A
Draw Lewis structures of the three isomers, all of which have a carbon–carbon double bond.
Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all hydrogen atoms.
do not forget about the lone pairs on the Cl atoms.
Answers
Dichloroethylene (C2H2Cl2) has three isomers, each of which is a different substance. The three isomers are: cis-1,2-dichloroethylene, trans-1,2-dichloroethylene, vinyl chloride
1. cis-1,2-dichloroethylene: This isomers has the Cl atoms on the same side of the carbon-carbon double bond. Its Lewis structure would be H3C-CHCl-Cl
2. trans-1,2-dichloroethylene: This isomer has the Cl atoms on opposite sides of the carbon-carbon double bond. Its Lewis structure would be H3C-CCl2-H
3. Vinyl chloride: This isomer has one chlorine atom bonded to the carbon atom double bonded to another carbon atom. Its Lewis structure would be H2C=CHCl
Each of these isomers have different chemical and physical properties. It's worth to mention that these structures are the Lewis Structure which are not always the same as the 3D structure of the molecule.
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A group claims that vaccines cause autism and children should not be
vaccinated. They claim that the symptoms of autism appear around the same
time children are vaccinated. Which piece of information is most useful in
evaluating this claim?
A. Famous people support the group.
B. Vaccines help prevent certain diseases.
C. The research study the group cites as evidence was proven to be
inaccurate.
OD. Vaccines used to contain ingredients that people thought could be
toxic.
Answers
The piece of information most useful in evaluating this claim is the research study the group cites as evidence was proven to be inaccurate (Option C).
Do Vaccines Cause Autism?A relatively recent publication indicated that certain vaccines might produce autism in children, thereby raising concerns about their use.
However, it has been shown that the scientific evidence in this publication may be erroneous and therefore the publication was retracted.
In conclusion, The piece of information most useful in evaluating this claim is the research study the group cites as evidence was proven to be inaccurate (Option C).
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Please I need help thank you
Answers
Answer:
its sodium hydroxide
Explanation:
state with examples four characteristic properties of transition metals
Answers
Answer:
good conductor of heat and electricity
they can be hammered or bent into shape easily.
they have high melting points(except mercury as they are liquid at room temperature)
they are usually hard and tough.
they have high density
The rate of reaction increases with increasing.
cati list
of the reactants, and with the addition of a
to the reaction mixture.
and
Answers
Answer: it is 800
Explanation:
Determine the number of moles of hydrogen atoms in each of the following.
8.55×10^-2 mol C4H10
Answers
Answer:
\(0.855molH\)
Explanation:
Hello there!
In this case, according to the given information, it is possible for us to realize this problem is about mole ratios. Thus, for the compound C4H10, note there is a 1:10 mole ratio to the hydrogen atoms, that is why the number of moles of the latter is calculated as shown below:
\(8.55x10^{-2} mol C_4H_{10}*\frac{10molH}{1molC_4H_{10}} \\\\=0.855molH\)
Regards!
can you please help me with this question
Answers
Answer:
Heat the water i'm pretty sure
Explanation:
Which of the following represents a beta decay?
O A. 220/86 Rn → 294/84Po + 4/2 He
O B. 60/28 Ni → 60/28 Ni + y
C. 235/93 Np → 23/91 Pa+ x
O D. 213/83 Bi → 214/84 Po+0/-1e
Answers
Answer:
Option D
Explanation:
Parent isotope has 83 protons, daughter isotope has only one more proton (84). Beta particle is very small, atomic mass of 212 stays the same in beta decay.
\(^2^1^2_8_3Bi\;\rightarrow\;^2^1^2_8_4Po\;+\;^0_-1e\) represents a beta decay. Parent isotope has 83 protons, daughter isotope has only one more proton (84). Beta particle is very small, atomic mass of 212 stays the same in beta decay.
What beta decay?In nuclear physics, beta decay (β-decay) is a type of radioactive decay in which a beta particle (fast energetic electron or positron) is emitted from an atomic nucleus, transforming the original nuclide to an isobar of that nuclide.
\(^2^1^2_8_3Bi\;\rightarrow\;^2^1^2_8_4Po\;+\;^0_-1e\)
In beta decay, one of the neutrons in the nucleus suddenly changes into a proton, causing an increase in the atomic number of an element.
Hence, option D is correct.
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Compare and contrast a scientific theory and a scientific law, and include an example of each.
Answers
A scientific principle describes a more specific set of relationships than is usually identified as law.
A scientific law describes an important relationship that is observed in nature to occur consistently time after time. The difference between a scientific principle and scientific law is usually one of the extents of the phenomena covered by the explanation, but there is not always a clear distinction between the two.
A scientific law is an explanation of an observed phenomenon. No explanation is given as to why or why the phenomenon exists. Explanations of phenomena are called scientific theories. Scientific laws predict outcomes for specific initial conditions. You can predict the color of your child's hair, or how far a baseball will travel if it is shot at a certain angle. Theory by contrast attempts to provide the most logical explanation for why things happen the way they do.
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What element has 12 protons, 12 neutrons and 12 electrons?
Answers
Answer:
magnesium atom
The most common and stable type of magnesium atom found in nature has 12 protons, 12 neutrons, and 12 electrons
The Kansas City Chiefs football team just won the Superbowl and an ESPN.com poll showed that 74% of fans were rooting for the Chiefs. As a result, what will happen to the demand curve for their merchandise like t-shirts and jerseys throughout the country? Show the shift in the demand curve below and list the determinant.
Answers
Due to their recent Super Bowl victory and the substantial number of supporters who supported them, the demand curve for Kansas City Chiefs items is probably going to veer to the right.
Which of the above statements best describes a bad leader?Effective leaders must be able to communicate clearly and listen intently. A leader is not going to be very effective if they are showing a lack of capacity to explain their goals and objectives to others.
Which of the following describes an effective leader?A good leader must possess integrity, self-awareness, courage, respect, empathy, and gratitude. They ought to be enhancing their nimbleness and exercising their influence while effectively communicating and assigning tasks.
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