Consider these equations: 2S(s)+3O2(g)→2SO3(g) , ΔH=−792kJ 2S(s)+2O2(g)→2SO2(g) , ΔH=−594kJ 2SO2(g)+O2(g)→2SO3(g) , ΔH=? What is the missing ΔH ? −294kJ −198kJ +198kJ +294kJ
Hess law can help us to obtain the enthalpy of a series of reactions by summation. The missing enthalpy of this reaction is −198kJ.
What is Hess law?According to the Hess law of constant heat summation, the enthalpy of a sequence of reactions can be obtained as the sum of the enthalpies of all the reactions.
Now looking at all the reavtion written here in order to obtain the missing enthalpy, we conclude that the missing enthalpy is −198kJ.
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2SO2 (g) + O2 (g)→2SO3 (g), ΔH = −198 kJ.
Brainliest to whoever answerers in time
Fireworks release A LOT of energy when they burn. According to the National Fire Protection Association, even a small sparkler can heat surroundings to more than 1,200ºF. What could make the combustion of gunpowder produce THAT MUCH heat?
Draw a model, create a graph, or write an explanation that includes:
How energy flows between the firework system and surroundings when bonds are broken and formed.
How the energy of breaking bonds compares relatively to the energy of bond formation in the combustion of gunpowder.
Explanation:
☹︎The base form (or root) of a verb is the form listed in the dictionary. It is the version of the verb without any endings (endings such as -s, -ing, and ed). The base form is the same as the infinitive (e.g., to walk, to paint, to think) but without the to.
Q3. Which of the following
Elements is likely to
form cations?
ง
A. Titanium (T:)
B. Carbon
C. Bromine
(Br)
) (Ar
D. Argon
Answer:
Titanium
Explanation:
titanium can form 4+ cations
How many grams of acid will be neutralized by a Maalox antacid tablet that contains 0.350 g of CaCO3
The mass of the acid produced is 0.252 g from the information in the question.
What is neutralization?The term neutralization refers to the reaction between an acid and a base that yileds salt and water only.
The equation of this reaction is; 2HCl + CaCO3 ----->CaCl2 + CO2 + H2O
Number of moles of CaCO3 = 0.350 g/100 g = 0.0035 moles
Since 2 moles of acid reacts with 1 mole of CaCO3
x moles acid reacts with 0.0035 moles of CaCO3
x = 0.007 moles
Mass of acid = 0.007 moles * 36 g/mol = 0.252 g
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How many joules of heat are giving off when 5.9 g of water cools from 75°C to 25 Celsius
Explanation:
The base form (or root) of a verb is the form listed in the dictionary. It is the version of the verb without any endings (endings such as -s, -ing, and ed). The base form is the same as the infinitive (e.g., to walk, to paint, to think) but without the to.
Write the essential condition for the following reaction to take place:2AgBr—->2Ag+Br
This is the decomposition of silver bromide
Silver bromide decomposes to give silver and bromine
Sunlight is the decomposing agent .
The reaction takes place in sunlightHence it should be placed in sunlightAnswer:
Sunlight
Explanation:
For silver bromide (AgBr) to decompose into silver metal and bromine gas, it can only take place in the presence of sunlightThe balanced reaction :⇒ 2AgBr → 2Ag + Br₂ When calcium carbonate is heated strongly, carbon dioxide is evolved.
CaCO3 > CaO + CO2
If 4.74g of calcium carbonate is heated, what volume of CO2 would be produced when collected at STP?
Show all steps (Answer: 1.06L)
If 4.74 g of calcium carbonate is heated, the volume of [tex]CO_2[/tex] that would be produced at STP will be 1.08 L
Volume of gas at STPFrom the equation of the reaction:
[tex]CaCO_3 --- > CaO + CO_2[/tex]
The mole ratio of [tex]CaCO_3[/tex] and [tex]CO_2[/tex] is 1:1
Mole of 4.74 g [tex]CaCO_3[/tex] = 4.74/100 = 0.0474 moles
Equivalent mole of [tex]CO_2[/tex] = 0.0474 moles
1 mole of gas at STP = 22.71 L
0.0474 moles at STP = 22.71 x 0.0474 = 1.08 L
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How can we know if an element is more active than the other one, so that it will displace it in displacement reaction.
Answer:
In a reactivity series, the most reactive element is placed at the top and the least reactive element at the bottom.
If two metals had the same specific heat, how can we distinguish them in two ways?
Answer:
Specific heat is an intensive property (like density, color, etc.) that does not depend on the amount of a substance present. This allows substances to be identified using their specific heat. Imagine an unknown metal of known mass is heated to a known temperature.
Explanation:
Predict the missing component in the nuclear equation
11C -> X + 0e
6 1
Answer:
A. Boron-11 with atomic number 5
what is kept constant is constant boyles law
Answer:
temperature, or true. I don't know which you want.
Explanation:
hope this helps
The first ionization energy of mercury is 1006 kJ/mol. The energy change for the reaction Hg(l) →Hg+(g) + e– is therefore
For the first ionization energy of mercury is 1006 kJ/mol. The energy change for the reaction is mathematically given as
dH = 1006KJ/mol
What is the energy change for the reaction?The amount of energy required to remove an electron from a neutral atom is called ionization energy. from the question, the electron is removed from the neutral atom Hg to give the first ionization energy
Hg→Hg +e
therefore the energy change for the reaction is
dH = 1006KJ/mol
In conclusion, the energy change for the reaction is
dH = 1006KJ/mol
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as a real gas deviates from ideal gas behavior, the particles _____
Answer:
Have some attraction towards each other
Explanation:
Gases deviate from the ideal gas behavior because their molecules have forces of attraction between them. At high pressure, the molecules of gases are very close to each other so the molecular interactions start operating and these molecules do not strike the walls of the container with full impact.
Hope this helps :-)
Have a great rest of your day or night!
Enjoy your studies and assignments
<3 simplysun
ps. I do not own any of these answers so please don't give full credit to me
If 4.0 L of a 4.6 M SrCl2 solution is diluted to 45 L , what is the molarity of the diluted solution
If 4.0 L of a 4.6M SrCl2 solution is diluted to 45L, the molarity of the diluted solution is 0.41M.
How to calculate molarity?The molarity of a diluted solution can be calculated using the following formula:
M1V1 = M2V2
Where;
M1 = initial concentrationM2 = final concentrationV1 = initial volumeV2 = final volumeAccording to this question, 4.0 L of a 4.6M SrCl2 solution is diluted to 45L, the molarity of the diluted solution is calculated as follows:
4.6 × 4 = 45 × M2
18.4 = 45M2
M2 = 18.4/45
M2 = 0.41M
Therefore, if 4.0 L of a 4.6M SrCl2 solution is diluted to 45L, the molarity of the diluted solution is 0.41M.
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A few million years ago, volcanic eruptions caused a large region to be covered by lava. The lava eventually cooled, which resulted in the formation of large amounts of igneous rock. Most of the rock formed was basalt. Today, this region is covered by soil, most of which is a soil known as laterite. Which geologic process caused the rock to change into soil?
A.
deposition
B.
erosion
C.
transportation
D.
weathering
Answer:
D
Explanation:
weathering is the breaking down of physical components through unfavorable weather conditions which can likely cause a change in physical properties
Which boilers recovers waste heat from a process?
[tex]\large\red{\underline{\textbf{Given:-}}}[/tex]
Answer:
WHR Boilers
Explanation:
I hope this helps.
An old 0.500 L lecture bottle of triethylamine (N(CH₂CH₃)₃) was found in a lab and needed for a synthesis reaction. A pressure regulator indicated a pressure of 27.0 psi, and the lab was at room temperature (25.0°C). What mass of vaporized triethylamine in grams was left in the lecture bottle?
Answer:
About 3.81 grams.
Explanation:
We can use the ideal gas law. Recall that:
[tex]\displaystyle PV = nRT[/tex]
Note that the universal gas constant R has the value 0.08206 L-atm/mol-K.
Hence, convert the measured pressure to atms (1 atm = 14.7 psi):
[tex]\displaystyle 27.0\text{ psi} \cdot \frac{1\text{ atm}}{14.7\text{ psi}} = 1.84\text{ atm}[/tex]
Rearrange the equation to solve for n, the number of moles of vaporized triethylamine and evaluate. The temperature is (25.0 + 273.15 ) K = 298.2 K:
[tex]\displaystyle \begin{aligned} n& = \frac{PV}{RT} \\ \\ & = \frac{(1.84\text{ atm})(0.500\text{ L})}{\left(\dfrac{0.08206\text{ L - atm}}{\text{mol-K}}\right)(273.2\text{ K})} \\ \\ &= 0.0376\text{ mol N(CH$_2$CH$_3$)$_3$}\end{aligned}[/tex]
Convert from moles to grams:
[tex]\displaystyle 0.0376\text{ mol N(CH$_2$CH$_3$)$_3$} \cdot \frac{101.22\text{ g N(CH$_2$CH$_3$)$_3$}}{1\text{ mol N(CH$_2$CH$_3$)$_3$}} = 3.81\text{ g N(CH$_2$CH$_3$)$_3$}}[/tex]
In conclusion, there is about 3.81 grams of vaporized triethylamine in the lecture bottle.
Select the correct answer.
Why are metals good conductors of heat and electricity?
A.
anions rotate around the stationary electrons
B.
cations rotate around the stationary electrons
C.
free moving atoms in metals carry both heat and electric current
D.
free moving electrons in metals carry both heat and electric current
E.
free moving protons in metals carry both heat and electric current
Answer:
D
Explanation:
the correct answer is D
A fossil is 3 half-life old. Measured Uranium-235 has half-life of 704 million years. How many years old is this fossil?
Answer: Uranium is not a problem in this case, as its radioactivity is very low. This is due to the long half-life. How much uranium will decay per second with a half-life of 700 million years? This is a very insignificant figure.
Identify the molecule with the highest boiling point. A(.C 6H 6 B(. NH 3 C(. OF 2 D(. CHCl 3
Answer:
C6H6
Explanation:
benzene (C6H6) is 80.1°C. ammonia (NH3) is -33.3°Coxygen difluoride (OF2) is -144.7°C.chloroform (CHCI 3) is 61.2°C.why is accurate body measurement important in dressmaking
Answer:
Without taking body measurements, the fabric material can run out of supply if the tailor uses it too much. And more material is required to fix small dresses or suits. So when body measurements are taken accurately, the tailor will know the exact amount of material to be used.
Explanation:
Balance the N-14(d,n) nuclear equation for radioisotope production in PET. This means to
write it out in equation form with 2 reactants and 2 products.
If 10.0 moles of O₂ are reacted with excess NO in the reaction below, and only 8.0 mol of NO₂ were collected, then what is the percent yield for the reaction?
2 NO (g) + O₂ (g) → 2 NO₂ (g)
Answer:
Explanation:
General Remarks
The balance numbers are the same. (The balance numbers are 2 and 2)
The balance number in front of the O2 is 1.
So for every mole of O2 needed 2 moles of NO2 should be produced.
If 10.0 moles of oxygen is used, then you should get 20 mols of NO2 should be produced.
Formula
% yield = (what was produced / what should have been produced) *100
Givens
What was produced = 7 moles
What should have been produced = 20 moles
Solution
Substitute the givens into the equation
% yield = 8/20 * 100
% yield = 0.40 * 100
Answer: 40%
8. Subshells half-filled with electrons are particularly stable. Can you suggest a possible physical basis for this claim?
The stability of atoms whose subshells are half-filled with electrons is due to equilibrium and symmetry.
How does subshells half-filled with electrons confer stability?The stability of an atom of an element depends on the number of electrons in its valence shell.
Atoms whose valence shells are completely filled are particularly stable atoms.
Similarly, subshells half-filled with electrons are particularly stable.
The stability of subshells half-filled with electrons can be explained based on equilibrium and symmetry.
A half-filled subshell distributes the energy of the electrons evenly and symmetrically such that the atom attians stability.
Therefore, stability of subshells half-filled with electrons is due to equilibrium and symmetry.
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H2O2_H2O+O2 balance the equation using inspection
Answer:
2H2O2 → 2H2O + O2
A molecule that is either cycloheptane or cycloheptene is treated with bromine and the sample immediately absorbs the red bromine color—which compound is present?
Since the molecule is able to immediately absorb the red color of the bromine, the molecule would be cycloheptene.
What is unsaturation?Unsaturation in organic compounds refers to the presence of double or triple bonds in the compounds.
One way to test for unsaturation is to use bromine water. A saturated compound will not be able to absorb bromine because it is already saturated.
An unsaturated compound, on the other hand, will be able to absorb bromine due to the unsaturation. Therefore, the red color of bromine will disappear due to absorption.
Cycloheptane is saturated while cycloheptene is unsaturated. Thus, the latter will absorb the red color of bromine.
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What is the electro negativity difference for CO ?
The electronegativity of carbon is about 2.5 , and that of oxygen is about 3.5 , and naturally, (3.5−2.5=1.0)>0 . So, the electronegativity difference is greater for a C−O single bond than a F−F single bond.
Answer:
1.0
I hope my answer helps you.
2KBr + Cl₂ → 2KCI + Br₂
What type of chemical reaction is this?
Answer:
Displacement reaction
Explanation:
A displacement reaction is a reaction where a more reactive halogen will displace a less reactive one.
Reactivity decreases down group 17. So Chlorine, being the more reactive halogen, substitutes in the place of Br which is less reactive.
Does cooking temperature affect the concentration of ethanoic acid in vinegar, measured by acid-base titration?
Yes it will.
Explanation:
At cooking temperature the concentration of ethanoic acid may be affected as the solution will boil therefore evaporating the water that will increase the concentration of acid in the solution.
If the pressure inside a hyperbaric chamber is 3.0 atm, what is the volume, in liters, of the chamber containing 2600 g of O2 at 26 °C?
Moles of O_2
2600g/32gmol^{-1}81.25molNow
[tex]\\ \rm\Rrightarrow V=\dfrac{nRT}{P}[/tex]
[tex]\\ \rm\Rrightarrow V=\dfrac{81.25(26)(8.314)}{3}[/tex]
[tex]\\ \rm\Rrightarrow V=5854.4L[/tex]
The volume of the gas in the chamber is equal to 664.36 L.
What is the ideal gas equation?The ideal gas law is defined as an equation of the state of an ideal gas. This equation is written as the product of the volume and pressure of 1 mole gas is equal to the product of the gas constant and absolute temperature of the gas.
The mathematical formula of the ideal gas law is as follows:
PV = nRT
Where n is the moles of gas, V is the volume of the gas, R is the gas constant and P is the pressure.
The temperature of the gas in the chamber, T = 26° C = 299 K
The pressure of the gas, P = 3 atm
The value of the gas constant, R = 0.082 atm L/K mol
The number of moles of a given gas, n = 2600/32 = 81.25 mol
Substituting the values n, R, P, and T in the equation, we get:
3 × V = 81.25 × 0.082 × 299.15
V = 664.36 L
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