Answers
Answer:
\(\Delta S=900\frac{J}{K}\)
Explanation:
Hello!
In this case, since the information is not missing, the following one will be used as it is found on similar problems:
\(\Delta h=26.7kJ/mol\\T_b=34.6\°C\\m=769.0g\)
In such a way, we use the following equation to compute the entropy:
\(\Delta S=\frac{n\Delta h}{T_b}\)
Whereas n (moles) are computed by using its molar mass (74.14 g/mol) as follows:
\(n=769.0g*\frac{1mol}{74.14g}=10.4mol\)
\(\Delta S=\frac{10.4mol*26.7\frac{kJ}{ml} }{(34.6+273.15)K}\\\\\Delta S=0.900 \frac{kJ}{K} \\\\\Delta S=900\frac{J}{K}\)
Best regards!
Related Questions
Describe how the thermal energy moves when a can of soda is taken out of the refrigerator and left on a counter for hours.
Answers
Calculate the mass of calcium carbonate that must be decomposed to produce 25.0 L of carbon dioxide gas at 26 °C and 0.997 atm . How many liters of CO2 would be produced if there was only a 78% yield?
Answers
The mass of calcium carbonate that must be decomposed to produce 25.0 L of carbon dioxide gas at 26 °C and 0.997 atm is 104.1 g
The volume of CO₂ produced with a 78% yield would be 19.7 L.
What mass of calcium carbonate must be decomposed to produce 25.0 L of carbon dioxide gas at 26 °C and 0.997 atm?The mass of calcium carbonate that must be decomposed to produce 25.0 L of carbon dioxide gas at 26 °C and 0.997 atm is calculated from the equation of the reaction as follows:
The balanced equation of reaction: CaCO₃(s) → CaO(s) + CO₂(g)
The number of moles of CO₂ produced is determined from the ideal gas equation:
n = PV/RT
n = (0.997 atm) × (25.0 L) / [(0.0821 L·atm/(mol·K)) × (299 K)]
n = 1.04 mol CO₃
From the balanced equation;
1 mol of CaCO₃ produces 1 mol of CO₂.
Moles of CaCO₃₃required = 1.04 mol of CaCO3.
the mass of CaCO3 needed will be:
mass = 1.04 mol × 100.09 g/mol
mass = 104.1 g
If there is only a 78% yield, the actual moles of CO₂ produced would be:
moles = 0.78 × 1.04 mol
moles = 0.81 mol
solving for volume using the ideal gas equation:
V = nRT/P = (0.81 mol) × (0.0821 L·atm/(mol·K)) × (299 K) / (0.997 atm)
V = 19.7 L
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A sample of helium gas initially at 0.90 atm is cooled from 18 degreeC to -48 degreeC at constant volume. What is the final pressure?
Answers
Answer: By using Ideal gas law PV=nRT ,the final pressure is calculated
Explanation:
In thermodynamics a constant volume process is known as isochoric process and in this volume remains constant and pressure varies along with the temperature .
FORMULA USED - PV=nRT
If Volume is constant ,then initial Temperature = 18+273 = 291K
final temperature =225K
initial pressure = 0.90 atm
final pressure = ?
The final pressure comes out to be 0.6958 atm.
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HELP ME PLEASE !!!
One time I went to the mountains. I was scared of altitude sickness, so I got cannisters of oxgen (O₂). These cannisters contain 2L of compressed oxygen (O₂). When the oxygen is pressurized, it condenses into its liquid form inside the cannister. How much would this oxygen (0₂) weigh in its liquid form?
2.9 grams
1.6 grams
3.6 grams
4.3 grams
Answers
Answer:2.9 grams
Explanation:i had this question
Which of the following is a true statement?
A)Temperature is a constant condition with respect to Charles's Law
B)Charles's Law involves the units of volume and pressure
The relationship between the units involved in Boyle's Law is one of exponential decay
C)The relationship between the units involved in Charles Law is exponential growth
D)None of these statements are true
Answers
Answer:
B) Charles's law involves the units of volume and pressure
The relationship between the units involved in Boyle's law is one of the exponential Decay
Explanation:
follow me for more of my answers
How are electricity and magnetism related?
Moving magnets can make electrical currents.
Electricity can create a magnetic field.
Electricity and magnetism are not related.
Protons and electrons are repelled by magnets.
Need help now this work is due by 5:00
Answers
Answer: Electricity and magnetism are essentially two aspects of the same thing, because a changing electric field creates a magnetic field, and a changing magnetic field creates an electric field.
Answer:How are electricity and magnetism related?
Moving magnets can make electrical currents.
Electricity and magnetism are not related.
Protons and electrons are repelled by magnets.How are electricity and magnetism related?
Moving magnets can make electrical currents.
Electricity and magnetism are not related.
Protons and electrons are repelled by magnets.How are electricity and magnetism related?
Moving magnets can make electrical currents.
Electricity and magnetism are not related.
Protons and electrons are repelled by magnets.
Explanation:
Which is the best term to use when describing the energy of motion?
CORO
chemical
kinetic
potential
thermal
Answers
Answer:
kinetic
Explanation:
Use the following information to answer the next 4 questions. Consider the following equilibrium: 2N02(g) + 2NO(g) + 02(g) Initially, 0.600 mol of NO, is placed in a 1.00 L flask. At equilibrium, the concentration of NO was found to be 0.460 mol/L. •The equilibrium law expression would be Select one:
Answers
Answer:
Second Option ([O2]*[NO]^2)/[NO2]^2
Explanation:
To find the Kc value of a reaction, you must divide the concentration of the products over the concentration of the reactants (divide right side of the reaction by the left side of the reaction)
you must also remember to turn the multiplier prefix such as the '2' in the 2NO into an exponent for that particular molecule in the Kc equation
as such, the second option is correct
Why glucose does not give positive result with iodine test but not starch?
Answers
Answer:
This is a physical test. A chemical test for starch is to add iodine solution (yellow/brown) and look for a colour change. In the presence of starch, iodine turns a blue/black colour. ... Benedict's reagent will give a positive test result for glucose but not for starch.
Explanation:
please give me brainlist and follow
Answer:Amylose in starch is responsible for the formation of a deep blue color in the presence of iodine. The iodine molecule slips inside of the amylose coil.
Explanation:This makes a linear triiodide ion complex with is soluble that slips into the coil of the starch causing an intense blue-black colo
At a constant temperature of 30 °C, an ideal gas occupies 2.78 Liters at a pressure of 1.27 atm. What will be the volume (L) at a pressure of 3.95 atm?
Answers
Answer:
\(V_2=0.894L\)
Explanation:
Hello there!
In this case, according to the given information, it turns out possible for us to solve this problem by using the Boyle's law for an inversely proportional relationship between pressure and volume at constant temperature, as described in the problem statement:
\(P_2V_2=P_1V_1\)
Thus, we solve for V2, final volume, to obtain the following result:
\(V_2=\frac{P_1V_1}{P_2} \\\\V_2=\frac{1.27atm*2.78L}{3.95atm}\\\\V_2=0.894L\)
Regards!
A small amount of chemical splashes in Frank’s eye. What should Frank do immediately?
Answers
Answer:
A small amount of chemical splashes in Frank's eye. What should happen next? Frank should go to the eyewash station while his lab partner tells the teacher what happened.
Explanation:
Brainlist
True or False:
Carbon forms an incredible variety of substances
because it has eight valence electrons making it a
very stable atom that readily bonds.
Answers
Answer:
true i think but dont take my word for it.✌
According to the electronic configuration, carbon has 4 valence electrons that makes it a very stable atom that readily bonds.
What is electronic configuration?Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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please answer holy its been an hour
Answers
Reverse the sign of the second equation, change the sign of the enthalpy and add. Option B
What is the enthalpy?The enthalpy could be obtained by the use of the Hess law of constant heat summation. As such, we have a number steps and it is possible for use to obtain the enthalpy of the final reaction as shown by a series of manipulations.
By inspection, we can see that, if we desire to obtain the enthalpy of the final reaction as shown, then we have to reverse the sign of the second equation, change the sign of the enthalpy and add. Option B
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calculate the volume of sulfur hexafluoride gas that is collected. you can assume the pressure in the room is exactly 1atm. round your answer to 3 significant digits.
Answers
Mols or Temprature was not given so I assumed 70f room and temp.
We know that P = 1 atm, n = number of moles, R = 8.314 J/mol*K and T = (70 + 459.67)*5/9 = 527.67K (converting the temperature from Farrenheight to Kelvin)
so, V = (nRT)/P
Therefore, we need the moles of sulfur hexafluoride gas to calculate the volume. Without the moles of the gas, it is impossible to determine the volume of the gas.
Calculate the mass of 9.96 times 10 to the power of 26 atoms of tellurium
Answers
Answer:
21121.58 grams
Explanation:
Given, 9.96 times 10 to the power of 26 atoms of tellurium
Convert atoms into moles of tellurium,
As we know, 1 mol= 6.02 *10 to the power of 23 atoms
Hence, 9.96 *10 to the power of 26/ 6.02 *10 to the power of 23= 1654 moles of tellurium
Now, mass= molar mass*moles
As we know, tellurium has a molar mass of 127.6000 g/mol
Mass= 1654 *1277 g/mol
= 21121.58
dropping an irregularly shaped object into a graduated cylinder will help you find the what? of that object
Answers
Answer:
Density
Explanation:
The density of an irregularly shaped object can be obtained by weighing it and then drooped int a graduated cylinder; observing the change in volume.
The density is the calculated as;
Density = Mass / Change in volume
where;
Change in volume = Final Volume - Initial Volume
A solution in which the pH is 1.6 would be described as
a.
very acidic
b.
slightly acidic
c.
very basic
d.
slightly basic
e.
neutral
Answers
Answer:
a. very acidic
Explanation:
A solution with a pH of 1.6 would be described as a very acidic solution.
The pH scale is a convenient scale for expressing the level of acidity or alkalinity of aqueous solutions.
The scale ranges from 1 to 14 in which case 1 is the lower limit and 14 the upper limit.
An acidic solution has a pH value less than 7. As pH decreases, the acidity of the solution increases. Neutral solutions have a pH of 7An alkaline solution has a pH greater than 7 and the level of alkalinity increases as pH increases.PLEASE HELPPP ME
Use the following balanced chemcial equation to answer the question below.
CaBr2 + Na2SO4 --> CaSO4 + 2NaBr
1. How many moles of sodium bromide can be made from 5 moles of calcium bromide
2. How many grams of calcium sulfate will be made from 2.00 moles of calcium bromide
3. How many grams of calcium bromide will be needed to make 845 grams of calcium sulfate
Answers
Answer:
1) (5 moles of calcium bromide) x 2 / 1 = 10 moles
2) (2.00 moles of calcium bromide) = 2.00 moles of calcium sulfate
so (2.00) x (136.1 g/mol) = 272.2 g
3) (845 grams of calcium sulfate) / 136.14 g/mol = 6.21 moles
6.21 moles of calcium sulfate = 6.21 moles of calcium bromide
(6.21 moles of calcium bromide) x 199.89 g/mol = 1241.32 g
for a generic equilibrium: HA(aq) <=> H+(aq) + A^-(aq) which of the following statements are true? question 21 options: (a) if you add the soluble salt KA to a solution of HA that is at equilibrium, the concentration of A- would decrease. (b) if you add the soluble salt KA to a solution of HA that is at equilibrium, the concentration of ha would decrease. (c) if you add the soluble salt KA to a solution of HA that is at equilibrium, the pH would increase. (d) the equilibrium constant for this reaction changes as the pH changes. (e) if you add the soluble salt KA to a solution of ha that is at equilibrium, the concentration of H would increase.
Answers
The given generic equilibrium is:HA(aq) ↔ H+(aq) + A−(aq)The statements that are true for this equilibrium are as follows:(a) If you add the soluble salt KA to a solution of HA that is at equilibrium, the concentration of A− would decrease.
This statement is true because the addition of KA to the solution would increase the concentration of A− ions, which will drive the equilibrium to the left, reducing the concentration of A− ions.(b) If you add the soluble salt KA to a solution of HA that is at equilibrium, the concentration of HA would decrease.This statement is false because the addition of KA would not affect the concentration of HAIf you add the soluble salt KA to a solution of HA that is at equilibrium, the pH would increase.This statement is false because KA is a salt of a strong base and a weak acid. Therefore, its addition to the solution would have no effect on the pH of the solution The equilibrium constant for this reaction changes as the pH changes.This statement is false because the equilibrium constant for a given reaction is a constant value, which does not change with changes in pH. If you add the soluble salt KA to a solution of HA that is at equilibrium, the concentration of H would increase.This statement is false because the addition of KA would not affect the concentration of H ions. Therefore, the correct answers are (a).If you add the soluble salt KA to a solution of HA that is at equilibrium, the concentration of A− would decrease.for more such question equilibrium
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Explain how an anthropologists uses a regression formula to estimate height
Provide an example with correct calculations
(ignore my tag for it being about chem they don't have forensics science on this site ig)
Answers
An example of a regression formula used to estimate height is the Fully's formula, which is based on measurements of the femur bone. The formula is:
Height (in centimeters) = 64.97 + (2.04 x length of femur bone, in centimeters)
So, for example, if an anthropologist measures a femur bone that is 46 centimeters long, they can use the Fully's formula to estimate the height of the individual to whom the bone belonged:
Height = 64.97 + (2.04 x 46)
Height = 64.97 + 93.84
Height = 158.81 centimeters
Therefore, the estimated height of the individual based on the length of their femur bone is 158.81 centimeters, or approximately 5 feet 2 inches.
It is important to note that regression formulas are not always accurate and may have a margin of error. Additionally, factors such as sex, age, and ancestry can also affect the accuracy of height estimation based on skeletal remains. As such, multiple formulas and measurements are often used to get a more accurate estimate.
Stamples of heterogeneous equilibria. FeO(s) + CO(g) = Fe(s) + CO₂(g) II. H₂(g) L₂(g) = 2HI(g) III. CO₂(g) + C(s) = 2CO(g) IV. N₂(g) 3H₂(g) + 2NH3(g) Identify I.
Answers
An example of heterogeneous equilibrium is:
I. FeO(s) + CO(g) ⇌ Fe(s) + CO₂(g)What is heterogeneous equilibrium?Heterogeneous equilibrium refers to an equilibrium state in a chemical reaction where the reactants and products exist in different physical states or phases. It occurs when substances in different phases, such as solids, liquids, and gases, are involved in a chemical reaction.
Considering the given equations:
The equation I: FeO(s) + CO(g) ⇌ Fe(s) + CO₂(g) represents a heterogeneous equilibrium.
This is because the reactants and products involve different phases (solid and gas). FeO is a solid (s), CO is a gas (g), Fe is a solid (s), and CO₂ is a gas (g). The reaction involves the conversion of a solid and a gas to another solid and a gas, and the equilibrium is established between these different phases.
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Chemists have determined that elements with atomic numbers greater than 92 are all
radioactive. In general, their half-lives are much shorter than the age of the universe. This
means that they no longer exist in nature and have all been artificially produced by
scientists in nuclear reactions.
Elements 93 through 105 in the periodic table have been created and named, and
scientists have claimed discovery of elements 106 and 107. The transuranium elements,
as they are called, become less stable as the atomic number and mass increase. For
example, element number 93, neptunium, has a half-life of two million years, while
element number 104, kurchatovium, has a half-life of 70 seconds.
The transuranium elements are the heaviest elements that exist and are readily
fissionable when subjected to nuclear bombardment. Chemists studying these elements
and the periodic table predict that stable elements may be found around atomic numbers
114 or 126.
Based on the information in the passage, which of the following relationships appears to
be true for those elements 93 through 105?
A. The greater the half-life, the greater the radioactivity.
B. The greater the atomic number, the greater the element stability.
C. The greater the radioactivity, the greater the half-life.
OD. The greater the atomic number, the lower the half-life.
OE. The greater the atomic number, the higher the half-life.
Answers
Answer:
The correct relationship is D. The greater the atomic number, the lower the half-life.
The passage states that the transuranium elements, elements with atomic numbers greater than 92, have short half-lives and become less stable as the atomic number and mass increase. It also gives specific examples of the half-lives of neptunium (element 93) and kurchatovium (element 104) to support this claim. Thus, as the atomic number increases, the half-life of the element decreases.
help pls!!!!!!!!!!!!!
Answers
Answer:
1. C + O₂ → CO₂
2. C + CO₂ → 2 CO
3. Fe₂O₃ + 3 CO → 2 Fe + 3 CO₂
my brain hurts. halp
Answers
Answer:
the answer is C ( i hope your teacher explains
If 28 grams of N reacts completely with 12 grams of H2, then how many
grams of NH6, will you
end with?
Answers
Answer:
Mass of NH₃ produced = 34 g
Explanation:
Given data:
Mass of nitrogen = 28 g
Mass of Hydrogen = 12 g
Mass of NH₃ produced = ?
Solution:
Chemical equation:
N₂ + 3H₂ → 2NH₃
Moles of nitrogen:
Number of moles = mass/molar mass
Number of moles = 28 g/ 28 g/mol
Number of moles = 1 mol
Moles of hydrogen:
Number of moles = mass/molar mass
Number of moles = 12 g/ 2 g/mol
Number of moles = 6 mol
Now we will compare the moles of hydrogen and nitrogen with ammonia.
H₂ : NH₃
3 : 2
6 : 2/3×6 = 4 mol
N₂ : NH₃
1 : 2
Number of moles of ammonia produced by nitrogen are less thus it will act as limiting reactant.
Mass of ammonia produced:
Mass = number of moles × molar mass
Mass = 2 mol × 17 g/mol
Mass = 34 g
Answer:32 grams.
czts
benzen has a boiling point of 80.10 c we know the change in boiling point for a solution of c6h14 in benzen is 2.25 what is the new boiling point for the solution
bp= ? c
Answers
The pressure of the environment affects the liquid's boiling point. The boiling point of the liquid is higher when it is under high pressure than when it is under normal atmospheric pressure. For a given pressure, various liquids have different boiling points.
The temperature at which a liquid's vapour pressure equals the surrounding atmosphere is known as the boiling point of the liquid. This temperature causes the liquid to become a vapour.
The temperature of the liquid, the pressure of the atmosphere, and the pressure of the vapour all affect its boiling point.
We know that change in temperature of a system is given by the following formula:
Initial boiling point (T₁) = 80.1 °C
ΔT = T₂ - T₁
2.25 = T₂ - 80.1
T₂ = 82.35 °C
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Answer:
82.35
Explanation:
acellus
A solution of aluminum chloride has a pH of (4.5x10^0). What is the [H3O*(aq)], in mol/L?
Note: Your answer is assumed to be reduced to the highest power possible.
Answers
The concentration of H3O+ ions in the solution of aluminum chloride is \(3.16×10^-5\) mol/L.
Aluminum chloride is an acidic salt that contains a cation, Al3+, and an anion, Cl-. When aluminum chloride is dissolved in water, it dissociates into its constituent ions, and the Al3+ cations hydrolyze to produce H+ ions.
This reaction leads to the formation of an acidic solution. The pH of a solution of aluminum chloride is \(4.5×10^0\). We need to determine the concentration of H3O+ ions in this solution.
The concentration of H3O+ ions in a solution is given by the equation: pH = -log[H3O+] where pH is the negative logarithm of the concentration of H3O+ ions in the solution. The negative sign indicates that the pH is inversely proportional to the concentration of H3O+ ions. To determine the concentration of H3O+ ions, we need to rearrange the equation:
[H3O+] = \(10^-pH\) Substituting the value of pH =\(4.5×10^0\), we get: [H3O+] = \(10^-4.5\)
The value of \(10^-4.5\) can be calculated using scientific notation: \(10^-4.5\)= \(3.16×10^-5\) mol/L
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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.
Given the reaction: Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
The reaction occurs more rapidly when a 10-gram sample of Mg is powdered rather than in one piece, because powdered
Mg has
1. less surface area
2. more surface area
3. a lower potential energy
4. a higher potential energy
Answers
calcium carbonate reacts with dilute hydrochloric acid according to the equation:
CaCO3 + 2HCl = CaCl2 + H2O + CO2
the rate of reaction decreases with time because the
Answers
Concentration of the reactants decreases over time as they are used up in the reaction. This means that there are fewer collisions between the reactant particles per unit time, leading to a decrease in the rate of reaction. Additionally, as the reaction progresses, the concentration of the product molecules increases, leading to an increase in the likelihood of the reverse reaction (i.e., CaCl2 + H2O + CO2 → CaCO3 + 2HCl) occurring. This also contributes to a decrease in the rate of the forward reaction over time.