Answer:
695.8kJ/mol = Enthalpy of combustion
Final temperature = 407.4°C
Explanation:
Taken the reaction:
2CH₃NO₂ + 3/2 O₂ → 2CO₂ + 3H₂O + N₂
The enthalpy of the reaction is the heat released when 1 mole of nitromethane are in combustion.
We need to find the moles presents in 121L of nitromethane using its density and molar mass (61.04g/mol). As these moles releases 1.6x10⁶kJ, we need to find heat released per mole of nitromethane
Mass nitromethane:
121L = 121000cm³ * (1.16g/cm³) = 140360g
Moles:
140360g * (1mol / 61.04g) = 2299.5 moles of nitromethane
Heat released per mole of nitromethane:
1.6x10⁶kJ / 2299.5 mol = 695.8kJ/mol = Enthalpy of combustion
The symbol - is because the heat is released, a + symbol is when the heat is absorbed.
Using:
Q = m×C×ΔT
Where Q is heat (1.6x10⁶kJ = 1.6x10⁹J)
m is mass of water:
1kL = 1000L = 1x10⁶mL = 1x10⁶g
C is specific heat of water: 4.184J/g°C
And ΔT is change in temperature.
Solving for ΔT:
1.6x10⁹J = 1x10⁶g * 4.184J/g°C * ΔT
ΔT = 382.4°C
As initial temperature was 25°C, final temperature is:
382.4°C + 25°C =
407.4°C
If you had to choose,
Happiness or Power? (Any type of Power)
Answer:
I will choose Happiness, Happiness, Happiness, Happiness.....
☺️❤️
Explanation:
Why Happiness Matters
It's the feeling of truly enjoying your life, and the desire to make the very best of it. Happiness is the "secret sauce" that can help us be and do our best. Here's what researchers found when they studied happy people: Happy people are more successful.
Scientific evidence suggests that being happy may have major benefits for your health. For starters, being happy promotes a healthy lifestyle. It may also help combat stress, boost your immune system, protect your heart and reduce pain. What's more, it may even increase your life expectancy.
Liquid hexane CH3CH24CH3 will react with gaseous oxygen O2 to produce gaseous carbon dioxide CO2 and gaseous water H2O. Suppose 5.2 g of hexane is mixed with 33.0 g of oxygen. Calculate the minimum mass of hexane that could be left over by the chemical reaction. Be sure your answer has the correct number of significant digits.
Answer:
The leftover is 15 g of oxygen rather than liquid hexane as the fuel limits the reaction.
Explanation:
Hello!
In this case, since the described combustion reaction is:
[tex]C_6H_{14}(l)+\frac{19}{2} O_2(g)\rightarrow 6CO_2(g)+7H_2O(g)[/tex]
Thus, since 5.2 g of hexane (86.2 g/mol) is reacted with 33.0 g of oxygen (32.0 g/mol) we can compute the mass of hexane that was actually consumed via stoichiometry with oxygen (1:19/2 mole ratio):
[tex]m_{C_6H_{14}}^{consumed \ by\ O_2}=33.0gO_2*\frac{1molO_2}{32.0gO_2}*\frac{1molC_6H_{14}}{\frac{19}{2}gO_2 } *\frac{86.2gC_6H_{14}}{1molC_6H_{14}} \\\\m_{C_6H_{14}}^{consumed \ by\ O_2}=9.36gC_6H_{14}[/tex]
It is proved then than the hexane won't have any leftover but oxygen does, as shown below:
[tex]m_{O_2}^{consumed \ by\ C_6H_{14}}=5.2gC_6H_{14}*\frac{1molC_6H_{14}}{86.2gC_6H_{14}} *\frac{\frac{19}{2}molO_2 }{1molC_6H_{14}} *\frac{32.0gO_2}{1molO_2} \\\\m_{O_2}^{consumed \ by\ C_6H_{14}}=18g[/tex]
It means the leftover of oxygen is:
[tex]m_{O_2}^{leftover}=33g-18g\\\\m_{O_2}^{leftover}=15g[/tex]
Regards!
Which of the following accurately pairs the part of an atom to its charge? A. Proton—no charge B. Neutron—positive charge C. Electron—negative charge D. Electron—no charge
Answer:
I think it's c but I'm not sure
Answer: C
Explanation:
Which compound most likely has Atoms Held together by ionic bonds?
A. Magnesium sulfide, MgS
B. Hydrogen peroxide, H2O2
C. Ammonia, NH3
D. Carbon monoxide, CO
Answer:
MgS Magnesium sulfide
raw material for fusion
Answer:
Deuterium and Lithium.
Explanation:
I searched it up on google.
Chose the molecular formula that represents an organic molecule.
H 2O
Cu 2O
NH 2
C 6H 12O 6
Answer:
(D)C 6H 12O 6
Explanation:
Answer:
[tex]C_{6} H_{12} O_{6}[/tex].
Explanation:
To answer this question you will need to learn about the molecular formula and organic elements.
So, Molecular Formulas tell you how many atoms of each element are in a compound or the actual whole number ratio; Multiple of Empirical*
Organic Elements - The Organic elements are Protein, Carbohydrates, Lipids, and Nucleic Acids. Lets break down each element. Proteins are made of amino acids. Carbohydrates are made of Carbon, oxygen and hydrogen. Lipids include fats and waxes and Nucleic acids are a long chain of components such as RNA and DNA. Also the other elements are nitrogen, oxygen.
*The Empirical Formula - Tells you the simplest of elements in a compound or the simplest whole number; ratio of the elements.
Next, Lets look at some examples of Molecular Formulas v.s The Empirical formula. To solve any problem with these 2, you simply simplify the Molecular formula.
Example 1 -
Empirical: [tex]C_{5} H_{11}[/tex] Molecular: [tex]C_{10} H_{22}[/tex]
See how you can do that? Simplify the molecular and it turns into an empirical.
Now lets dig in to the possible answers -
[tex]C_{6} H_{12} O_{6}[/tex] - Glucose. Glucose is a carbohydrate or sugar. It is one type of sugar. It is important to us and all living beings because cells in a organism uses it as energy. Remember, Glucose is a Carb and a Carb is one of The Organic Elements! so we can put this on the list of possible answers
[tex]NH_{2}[/tex] - Amino radical. Amino radical (aka the aminyl radical), is the neutral form of the amide ion. This means in terms of Positive and Negative, Amino radical is the neutral version of amide ion. Amide Ion is not a Organic Molecule, so it is not a possible answer.
[tex]CU_{2} O[/tex] - Copper(I) oxide. (aka cuprous oxide) is a chemical compound. It has copper in its +1 oxidation state and contains oxide ions. Copper(1) oxide is a chemical compound so it is not a possible answer.
[tex]H_{2} O[/tex] - Water. [tex]H_{2} O[/tex] is the symbol for water. Each molecule of water has 2 atoms of hydrogen and a single atom of oxygen. While this may seem a possible answer because water is a natural resource, it isn't a organic molecule.
So, the only possible answer is [tex]C_{6} H_{12} O_{6}[/tex].
Hope this helped you! I took a really, really long time on this question, i had the same one in school. Please mark me brainliest and Have a great day!
In an aqueous solution of a certain acid the acid is 0.094% dissociated and the pH is 4.55. Calculate the acid dissociation constant Ka of the acid. Round your answer to 2 significant digits
Answer:
Explanation:
pH = 4.55
[ H⁺ ] = 10⁻⁴°⁵⁵
= 2.82 x 10⁻⁵
Let the acid be HA and its molar concentration be a .
HA ⇄ H ⁺ + A ⁻
a - .094x10⁻³a .094x10⁻³a .094x10⁻³a
.094x10⁻³a = 2.82 x 10⁻⁵
a = 30 x 10⁻²
= .3
a - .094x10⁻³a = .3 - .094 x 10⁻³ x .3
= .29997 approx
Ka = 2.82 x 10⁻⁵ x 2.82 x 10⁻⁵ / .29997
= 7.95 x10⁻¹⁰ / .29997
= 26.5 x 10⁻¹⁰
= 27 x 10⁻¹⁰ ( rounding off to two digits )
From the following heats of reaction,
2C (graphite) + H2 (g) -->C2H2 (g) H = 227 kJ
6C (graphite) + 3H2 (g) -->C6H6 (l) H = 49 kJ
calculate the heat for the reaction
3C2H2 (g) -->C6H6 (l)
A. 26.7 kJ
B. -26.7 kJ
C. -178 kJ
D. 178 kJ
E. -632 kJ
F. 632 kJ
Answer:+178
Explanation:
The heat of the reaction for the following reactions is 178 kJ. the correct option is D.
What is the heat of the reaction?The heat that is added or removed during a chemical reaction is called the heat of reaction.
It is also called the enthalpy of the reaction.
The heat is absorbed or released to maintain the temperature of the reaction.
The enthalpy can be calculated by subtracting the enthalpy of the product from the enthalpy of the reactant.
Thus, the correct option is D.
Learn more about the heat of the reaction
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Saturated solutions of which of these ionic compounds have the highest boiling point?A.Cd(OH)2 (Ksp = 5.9 x 10-15)B.Zn(OH)2C.Mg3(PO4)2D.AgNE.AgI(Ksp = 1.1 x 10-17) (Ksp = 1.0 x 10-25) (Ksp = 7.2 x 10-11) (Ksp = 8.5 x 10-17)
Answer:
D. AgN.
Explanation:
Hello!
In this case, since the boiling point of a solution increases are more solute remains dissolved in the liquid, as more energy is required to start the phase transition, for insoluble solids for which we know the solubility product which has the following relationship with the amount of ions in solution:
"the greater Ksp, the more ions the solution has"
In such a way, for the solid with the greatest Ksp we understand it has most of the ions in solution and therefore the highest boiling point, thus, among the choices, D. AgN is the one with the highest boiling point because it Ksp is 7.2E-11, whcih is the greatest.
Best regards!
PLS HELP ME FOR BOTH QUESTIONS
Answer:
IF the match is stuck on the side it could chach burning hot.
2) the burn peices looks like its burned and it becomes black since of it.
Explanation:
How many milliliters of a 0.266 M CsNO3 solution are required to make 150.0 mL of 0.075 M CsNO3 solution
Answer:
The required milliliters of CsNO3 in solution 1 = 42.29 mL
Explanation:
Given that:
The molarity of CsNO3 in solution 1 M₁= 0.266 M
The Volume of CsNO3 in solution 1 V₁ = ???
The Volume of CsNO3 in solution 2 V₂ = 150.0 mL
The molarity of CsNO3 in solution 2 M₂= 0.075 M
By the application of the titrimetric concept:
M₁V₁ = M₂V₂
We have;
0.266 M × V₁ = 0.075 M × 150.0 mL
V₁ = ( 0.075 M × 150.0 mL ) / 0.266 M
V₁ = (11.25 / 0.266 ) mL
V₁ = 42.29 mL
Look at the picture below. Name the isotope.
Answer:
carbon-13
Explanation:
A car traveled 150 meters in 5 seconds, what was its speed? 1.
Pepper the dog traveled 100 meters in 10 seconds, what was Pepper’s speed? 2.
Tony drove his car 1000 meters in 2 minutes, what was the speed of the car? 3.
A bird is flying over New York at a speed of 10 miles per minute. It traveled at this speed for 20 minutes. How far did it fly? 4.
Answer Them all and get 25 points!!!!
Answer:
1. car traveled 30 meters per second
2. pepper traveled 10 meters per second
3. tony drove around 500 meters per minute
4. the bird traveled 200 miles
Hope this helped!
give an example of coupling reaction
Answer:
An example is the formation of ATP, which is an endergonic process and is coupled to the dissipation of a proton gradient.
Explanation:
Hope this helped!
In case of accidental contact with chemicals, how long should the eyes be flushed at the eyewash station
Answer:
See the answer below
Explanation:
The duration of flushing the eyes at the eyewash station in case of accidental contact with chemicals depends of the nature of the chemical.
If the chemical is known to be a non-irritant or mild-irritant one, a 5-minute washing time is recommended as the first aid. before seeking the help of a physician,
For moderate to severe irritant chemicals, an immediate 15-20 minutes washing period is recommended before seeking further medical help.
For corrosive and strong alkalis chemicals, 30 and 60 minutes washing are recommended respectively before seeking the attention of a physician.
However, if the nature of the chemical is unknown, a minimum of 20-minutes washing is generally recommended as first aid before seeking immediate medical help.
The duration of flushing the eyes at the eyewash station in case of accidental contact with chemicals depends on the nature of the chemical.
If the chemical is known to be a non-irritant or mild-irritant one, a 5-minute washing time is recommended as the first aid. before seeking the help of a physician,For moderate to severe irritant chemicals, an immediate 15-20 minutes of washing is recommended before seeking further medical help.For corrosive chemicals, 30 and 60 minutes of washing are recommended respectively before seeking the attention of a physician.If the nature of the chemical is not known, a minimum of 20-minutes of washing is generally recommended as first aid before seeking immediate medical help.
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The pressure inside a hydrogen-filled container was 2.10 atm at 21 ∘C. What would the pressure be if the container was heated to 91 ∘C?
Answer:
[tex]P_2=2.60atm[/tex]
Explanation:
Hello!
In this case, since the temperature and pressure are related via a directly proportional relationship, via the Gay-Lussac's law we can write:
[tex]\frac{P_1}{T_1} =\frac{P_2}{T_2}[/tex]
Thus, since the initial temperature in kelvins is 294.15 K and the final temperature in kelvins is 364.15 K, we can compute the final pressure as shown below:
[tex]P_2=\frac{P_1T_2}{T_1} =\frac{2.10atm*364.15K}{294.15K}\\\\P_2=2.60atm[/tex]
Best regards!
Answer:
2.63 atm
Explanation:
the answer is 2.63 atm
What will be the substitution product of (S)-2-chloro-3-methylbutane in polar aprotic conditions favoring SN2?
if you are correct i will be sure to give your brainliest
Answer:
slow down speed updon't change1 will be the right answerAnswer:
Speeds up
Explanation:
4 As a boulder rolls from the top of a hill to the bottom, how do its potential and kinetic energy change? *
A Potential and kinetic energy both increase.
B Potential increases and kinetic decreases.
C Potential decreases and kinetic increases.
D Potential and kinetic energy both decrease..
Answer:
c. Potential decreases and kinetic increases.
Explanation:
As the boulder is rolling down the hill, potential energy decreases as kinetic energy increases.
Please Brainliest me
Which of the following is an example of a mixture?
A.
calcium
B.
the atmosphere
C.
carbon dioxide
D.
water
Answer:
B. the atmosphere
Explanation:
hope it helps
Examples of solutions can be:
O A. a solid dissolved in a liquid
O B. gas mixed with a liquid
O C. liquid mixed with a liquid
OD. all of the the above
Answer:
B. gas mixed with a liquid
Explanation:
because:
A. a solid can't dissolve in a liquid.
C. two liquids mixed isn't a solution
D. Not All of the above for sure.
Examples of solutions can be all of the above. The correct option is D.
What is a solution?A solution is made when a solute is mixed with a solvent. The solution can be a liquid, solid, or gas. The solution is made when the solute is fully mixed with the solvent. The solute is the substance that gets mixed, and the solvent is the base in which the solute gets dissolved.
So, a solid dissolved in a liquid, gas mixed with a liquid, or a liquid mixed with a liquid, the energy statement is true for a solution.
Examples of a solution are sugar dissolved in water when water mix with soda and state gets mixed with water or another gas.
Thus, the correct options are D. all of the the above.
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An atom of beryllium has 4 protons, 4 electrons, and 5 neutrons. What is its mass number?
Answer:
40 is correct
Explanation:
Your answer should be 4.
Hope this helped!
-candycchandler
Please help me it’s due today
Answer:
I think it is A. the two forces are equal, or balanced, neither the table nor the book moves up or down.
Explanation:
Tome, the other options don’t make no sense
Identify the titration curve for a monoprotic weak acid titrated with a strong base.
Answer:
Titration is a technique to determine the concentration of an unknown solution. As illustrated in the titration setup above, a solution of known concentration (titrant) is used to determine the concentration of an unknown solution (titrand or analyte).
Typically, the titrant (the solution of known concentration) is added through a burette to a known volume of the analyte (the solution of unknown concentration) until the reaction is complete. Knowing the volume of titrant added allows us to determine the concentration of the unknown analyte. Often, an indicator is used to signal the end of the reaction, the endpoint. Titrant and analyte is a pair of acid and base. Acid-base titrations are monitored by the change of pH as titration progresses.
Let us be clear about some terminologies before we get into the discussion of titration curves.
Use the image to complete the sentences.
At left a grid labeled A of regularly arranged orange balls with small movement lines near each. At right a grid labeled B of regularly arranged orange balls with large movement lines near each.
Two different substances, Substance A and Substance B, are in direct contact with each other and are at different temperatures.
The particles in Substance B are vibrating
the particles in Substance A. This means Substance B is
Substance A and conduction will
.
Answer:
1. FASTER THAN- #2
2. WARMER THAN #1
3. OCCUR FROM SUBSTANCE B TO SUBSTANCE A- #3
Explanation:
I did the assignment On edg And got it right
Answer:
Use the image to complete the sentences.
At left a grid labeled A of regularly arranged orange balls with small movement lines near each. At right a grid labeled B of regularly arranged orange balls with large movement lines near each.
Two different substances, Substance A and Substance B, are in direct contact with each other and are at different temperatures.
The particles in Substance B are vibrating
✔ faster than
the particles in Substance A. This means Substance B is
✔ warmer than
Substance A and conduction will
✔ occur from Substance B to Substance A
.
Explanation:
I know im late
Which of the compounds of H3PO4, Mg(OH)2, LiOH, and HCl, behave as acids when they are dissolved in water?A. Mg(OH)2 and LiOH.B. B H3PO4 and HC.C. Only HCl.D. Only LiOH.
Answer:
B. H3PO
Explanation:
The pH, texture, reactivity, and conductivity should be seen while determining acid or base. Among given option, H₃PO₄ is the acid when dissolved in water.
What are acid and base?Acid is a substance that has sour taste, pH lies in the range of 0-7 and give hydronium ion when dissolved in water. Acid turns blue litmus red. Whereas base has bitter, its pH is between 7-14 and it turns red litmus blue. It give hydroxide ion when dissolved in water.
Extensive properties, such as mass and volume depend on the amount of substance present and are not useful in the identification of a substance. Measuring mass and volume is not useful While determining acid or base. Out of given compounds, H₃PO₄ is the acid when dissolved in water.
Therefore, H₃PO₄ is the acid when dissolved in water.
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Maybe someone knows how to name compounds by IUPAC ?
Explanation:
The IUPAC system of nomenclature aims to ensure
that every organic compound has a unique, unambiguous name.that the IUPAC name of any compound conveys the structure of that compound to a person familiar with the system.
One way of checking whether the name you have given to an alkane is reasonable is to count the number of carbon atoms implied by the chosen name. For example, if you named a compound 3‑ethyl-4‑methylheptane, you have indicated that the compound contains a total of 10 carbon atoms—seven carbon atoms in the main chain, two carbon atoms in an ethyl group, and one carbon atom in a methyl group. If you were to check the given structure and find 11 carbon atoms, you would know that you had made a mistake. Perhaps the name you should have written was 3‑ethyl-4,4‑dimethylheptane!
plz answer plzplzpzlpl
A student performs an experiment in which 5.0 g of potassium chloride, KCI, are dissolved into 100.0 mL of distilled water. The student records the
temperature both before and after dissolving the KCl into the water, as shown in the data table below. Use this data to answer the question that follows.
Initial Temperature, °C Final Temperature, °C
21.8°C
16.4°C
Which statement below is a correct conclusion based on these results ?
The temperature of the water decreases and so the reaction is exothermic
The temperature of the water increases and so the reaction is exothermic
The temperature of the water decreases and so the reaction is endothermic
The temperature of the water increases and so the reaction is endothermic
Answer:
The temperature of the water decreases and so the reaction is endothermic
Explanation:
This option is correct because when the 5.0g potassium chloride (KCl) was added to the 100.0ml distilled water, the KCl made the water absorb heat coming from it which made the water decrease in temperature thereby causing an endothermic reaction.
An endothermic reaction actually takes place when the temperature of a system which is isolated decreases. The surroundings of a non-isolated system actually gains heat. While in an exothermic reaction, the temperature of a system increases due to the release or evolution of heat. This heat is released into the surroundings.
Write the formula for each compound. Capitalization and subscripts are graded. (a) selenium tetrafluoride (b) oxygen difluoride (c) dinitrogen monoxide (d) phosphorus trichloride
Answer:
(a) SeF₄
(b) OF₂
(c) N₂O
(d) PCl₃
Explanation:
Write the formula for each compound.
(a) selenium tetrafluoride. According to the name, this compound has 1 atom of Se and 4 atoms of F. The resulting formula is SeF₄, in which Se has the oxidation number 4+ and F has the oxidation number 1-.
(b) oxygen difluoride. According to the name, this compound has 1 atom of O and 2 atoms of F. The resulting formula is OF₂, in which the oxidation number of O is 2+ and the oxidation number of F is 1-.
(c) dinitrogen monoxide. According to the name, this compound has 2 atoms of N and 1 atom of O. The resulting formula is N₂O, in which the oxidation number of N is 1+ and the oxidation number of O is 2-.
(d) phosphorus trichloride. According to the name, this compound has 1 atom of P and 3 atoms of Cl. The resulting formula is PCl₃, in which the oxidation number of P is 3+ and the oxidation number of Cl is 1-.