The enthalpy change for the formation step of this intermediate is 136 kJ/mol.
What is the enthalpy?The enthalpy of reaction can be obtained from the enthalpies of formation of the species involved. The enthalpy of reaction is the heat evolved or absorbed in a reaction.
Thus, the enthalpy change for the formation step of this intermediate is 4 * 34 kJ/mol = 136 kJ/mol.
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If the pressure starts at 36 Kia what is the final pressure
answer:
is Well-Known Member. For a 35" you should be in the 28-32 range on road.
Explanation:
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What would be the minimum energy Emin required to excite a hydrogen atom from its lowest energy level
The minimum energy required to excite a hydrogen atom from its lowest energy level is 10.2 eV.
What is excitation?The term excitation has to do with the promotion of an electron from a lower to a higher energy level.
In this case, we are dealing with the hydrogen atom having only one electron. Thus, the minimum energy required to excite a hydrogen atom from its lowest energy level is 10.2 eV.
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the condensed formula ch3ch(ch3)2 represents
The molecular formula CH₃CH(CH₃)₂ is the condensed formula for the hydrocarbon methylpropane.
What are organic compounds?Organic compounds are compounds that are obtained from organic materials.
The most common organic compound are the hydrocarbons,
The hydrocarbons includes the alkanes, alkenes, alkynes, etc.
The given compound CH₃CH(CH₃)₂ is the condensed formula for the hydrocarbon methylpropane.
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PLEASE I REALLY NEED HELP!!! ITS NOT MULTIPLE CHOICE BTW :'(
A 76.0-gram piece of metal at 96.0 °C is placed in 120.0 g of water in a calorimeter at 24.5 °C. The final temperature in the calorimeter is 31.0 °C. Determine the specific heat of the metal. Show your work by listing various steps and explain how the law of conservation of energy applies to this situation.
Answer:
660J/kg.°C
Explanation:
Using the fact that
∆E of metal + ∆E of water = 0
∆E of the metal = Q = m*c*(T2-T1)
Where
Q = heat lost or gained = ?
m = mass of metal in kg = 0.076kg
c = specific heat of the metal = ?
T1 = 96°C
T2=31°C
∆E of the water=Q= m*c*(T2-T1)
Where
Q = 0.120*4180*6.5 = 3260J
Therefore
3,260J + Q of the metal =0
3,260J + 0.076*C*(31.0–96.0)=0
3,260J - 4.94c = 0
3,260 = 4.94c
3,260/4.94 = c
660J/kg.°C = specific heat of the metal
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What is the volume of a sample of mercury, a liquid metal, if it has a density of 14 g/ml and a mass of 28 g?
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What mass of CO is required to react with 25.13 g of Fe2O3
according to the equation Fe₂O3 + 3 CO2 Fe + 3CO₂?
Answer:
convert the 25.13 g of Fe2O3 into moles by dividing by its molar mass (159.69) to get that. When looking at the stoichiometric coefficients, we can see that for every 1 mole of Fe2O3, there needs to be 3 moles of CO.
Explanation:
At what temperature would 0.46 moles of a gas occupy 13.3 L if the pressure is 734 mm Hg?
Answer: 339.84 K
Explanation:
[tex]$$We are given: \\$\mathrm{n}=0.46$ moles \\$V=13.3 \mathrm{~L}$\\$\mathrm{P}=734 \mathrm{~mm} \mathrm{Hg}=0.965 \mathrm{~atm}$\\Putting these values in ideal gas equation we get:\\$0.965$ batm * $13.3 \mathrm{~L}=0.46 \mathrm{~mol} * 0.0821 \frac{\mathrm{atmL}}{\mathrm{molK}} * \mathrm{~T}$\\$\mathrm{T}=\frac{0.965 * 13.3}{0.46 * 0.0821} \mathrm{~K}$$$\mathrm{T}=339.84 \mathrm{~K}$$[/tex]
Two chemicals react in an endothermic reaction. what can be known about this reaction? the new substance will need more energy to form its chemical bonds than the old substance will release. more energy will be released from the old substance than the new substance will need to form its chemical bonds. a precipitate will form as a result of the reaction. a gas will form as a result of the reaction.
The new substance will need more energy to form its chemical bonds than the old substance will release. Hence, option A is correct.
What is an endothermic reaction?Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products.
Endothermic reactions, in general, are those that absorb (or use) energy. In endothermic reactions, more energy is absorbed when bonds in the reactants are broken than is released when new bonds are formed in the products.
Normally, when a chemical bond is broken, energy is released in the process. The chemical bond formation also demands an energy input.
The energy that is supplied/released can come in varieties (such as heat, light, and electricity). The formation of chemical bonds following the absorption of heat from the environment characterizes endothermic processes.
When two chemicals react in an endothermic reaction the new substance will need more energy to form its chemical bonds than the old substance will release. Hence, option A is correct.
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what is the specific heat capacity of propan-1-ol
Answer:
14
Explanation:
sun normal persentage is 14
One atomic mass unit ( 1 amu)
is equal to the mass of a carbon-12 atom multiplied by the quantity
Answer: 1/12
Explanation:
A carbon-12 atom has a mass of 12 amu, so multiplying this by 1/12, we get 1 amu.
How many moles of na contain 7.88x1021 atoms of na
Answer:
the answer to the qustion is 0.013089701 na
Explanation:
n/a
Having problems figuring out molar mass in general. steps would be most appreciated.
Answer:
The periodic table
Explanation:
As you can see in the screenshot. Each element on the periodic table has an atomic number and a mass number. The atomic numbers are arranged in numerical order from right to left in the periodic table. The second number there is the atomic mass.
When doing stoichiometric ratios, you need to use the atomic mass of each element to determine the molecular/molar mass.
example. Find the molar mass of
H₂SO₄
Hydrogen (2) + sulphur (1) +oxygen (4)
= atomic mass of H(2)+ atomic mass S(1)+ atomic mass oxygen(4)
=1(2) + 32(1)+16(4)
=2+32+64
=98
N.B We do not use the co-efficient when looking for molar mass, we only use the atom and subscript
Identify the polarity of an H-I bond and the polarity of an S-S bond?
Answer:
5095 JULLITET LI\
Explanation:
pls help me with this chem question
Answer:
B
Explanation:
i just know
Answer:
B
Explanation:
Hydrocarbons are with hydrogen and carbon only, so therefore you can immediately eliminate C and D. Therefore, we are left with A and B. Unsaturated hydrocarbons have double bonds or more, so B would be our answer (Double bond between carbon 1 and 2)
Some scientists believe that the mass extinction of dinosaurs was caused by the impact of a large meteorite on earth. this impact would have caused a darkening of the sky due to dust blown into the upper atmosphere. this darkening would have reduced the sizes of some ecosystems because of
The darkening of the atmosphere caused by meteorites would have reduced the sizes of some ecosystems due to less solar energy being available to plants.
What is Solar energy?This is the form of energy which is derived from the sun and is usually trapped by plants during photosynthesis.
Plants being primary producers will have less photosynthetic activity thereby leading to less food production and oxygen availability.
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The elaboration likelihood model emphasizes the use of __________ persuasion and __________ persuasion methods. a. direct . . . elaborative b. peripheral . . . elaborative c. direct . . . peripheral d. indirect . . . direct
The elaboration likelihood model emphasizes the use of direct persuasion and peripheral persuasion methods.
What is direct persuasion and peripheral persuasion?
This theory involves a dual process which explains how attitudes are changed in individuals through persuasion.
These methods help in the formation of attitude which makes, in this case, option use of direct persuasion and peripheral persuasion.
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Answer:
C. direct . . . peripheral
Explanation:
Because I said so.
a person who eats three servings of the cereal without milk will consume__ calories__ grams of carbohydrates
A person who eats three servings of the cereal without milk will consume about 117 percent of calories.
What is Calorie?This is defined as a unit of energy and is commonly used in the body system.
One serving of cereal without milk will contain 39 percent of calories while three servings will be 117 percent.
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ANS THIS SMALL QUESTION
which compund do not exist in independant molecular form
Answer:
Ionic compounds do not exist in independent molecular form
-Lexi
What kind of scientist would study how mistletoe harms trees
Answer:
A Dendrologist! They are the type of Scientist that studie trees.
PLS I WILL GIVE BRAINLY How do the number of violence electrons of the light metals compared to those heavier than boron
The valence electron of the light metals are all in the range of 1 to 3.
What are Valence electron ?Valence Electron is the number of electrons in the outer shell of an atom which participate in bond formation.
Number of Valence Electron in Boron is 3 and other light metals lighter than Boron have 1 , 2 of Lithium and Beryllium respectively,
The valence electron of the light metals are all in the range of 1 to 3.
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20 ml of a mixture of C2H6 and C3H8 gases in X : Y mole ratio, is burnt completely by which 52 ml CO2 gas is evolved. If 20 ml of a mixture of CH4 and C4H10 gases in Y : X mole ratio is burnt completely then what is the volume (in ml) of CO2 gas evolved?
A) 40 B) 44 C) 50 D) 55
The volume of CO2 prodiced when 12 mL of CH4 and 8 mL of C4H10 is burnt is 56 mL.
What is the equation of the reaction?The equation of the combustion of C2H6, CH4, C4H10, and C3H8 gases are given below:
2 C2H6 + 7 O2 ---> 4 CO2 + 6 H20
C3H8 + 5 O2 ---> 3 CO2 + 4 H20
CH4 + 2 O2 ----> CO2 + 2 H2O
2 C4H10 + 13 O2 ---> 8 CO2 + 10 H2O
X moles of C2H6 will produce 2X moles of CO2
Y moles of C3H8 will produce 3Y moles of CO2
Thus;
X + Y = 20 mL
X =20 - Y ---(1)
2X + 3Y = 52 mL ---(2)
Solving for X by substituting in (2)
2 (20 - Y) + 3Y = 52
40 - 2Y + 3Y = 52
Y = 12 mL
Then X = 8 mL
Volume of CO2 produced when 12 mL of CH4 and 8 mL of C4H10 is burnt = (12 × 2 + 8 × 4) = 56 mL
Therefore, the volume of CO2 produced is 56 mL.
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In the chemical equation below, name the reactant(s) and product(s).
CH4 (g) + O2 (g) → CO2 (g) + H₂O (g)
Answer:Methane(CH4) and dioxygen(O2) are the reactants
Carbon dioxide(CO2) and water(H2O) are the products
Explanation:
A company is announcing the construction of a new skyscraper to the public. Which model will give the best idea of how the new building will change the city skyline?
A.
a drawing showing the interior of the building
B.
a full scale, three-dimensional model of the building
C.
a rough sketch of the building's shape
D.
a drawing showing both the new and old buildings
Answer:
D.
Explanation:
This is because this option would allow one to see the sorroundings of the new building. The others only give perpectives on what the new building looks like, isolated from its sorroundings.
What is the molarity of a solution that is composed of 2.00 moles of potassium iodide dissolved in 4 l of water
Answer:
0.5 M
Explanation:
molarity = (moles of solute)/(liters of solution)
molarity = 2.00/4 = 0.5 M
Unit 8 Multiple Choice Questions
1. Which statements regarding the presence of greenhouse gases in the
atmosphere is a FALSE statement?
4
OA. The atmosphere is mostly non-greenhouse gases
OB. The atmosphere contains a small amount of greenhouse gases
C. The atmosphere has never changed
O
D. The greenhouse gases in the atmosphere have a large impact on the Earth's
climate.
This is a required question
Answer:
C
Explanation:
just did it
In industrialized states every tenth adult suffers daily, and every third occasionally, from heartburn. In Germany almost ten million people are affected by this disease. Helpful medicines against heartburn are the so-called ‘antacids’.
Antacids bound acids against an over-acidification of the stomach. The stomach acid contains hydrochloric acid (HCl, dissolved in water), which reacts with the antacid to form water, carbon dioxide and the corresponding salt. Generally, antacids are carbonates. Very common is ‘Bullrichs salt’, which uses sodium hydrogen carbonate as active ingredient. A single dose of an antacid is to be chosen in a way that it will react with two grams of hydrochloric acid. You are to formulate the instruction leaflet for a pharmaceutical company, which sells calcium carbonate (CaCO3) as an antacid. The dosing instruction says that in case of heartburn, one tablet with sufficient water is to be ingested.
But the specification, how many grams of calcium carbonate one tablet contains, is still missing…
Answer:
Antacids are medicines that counteract (neutralise) the acid in your stomach to relieve indigestion and heartburn. They come as a liquid or chewable tablets and can be bought from pharmacies and shops without a prescription.
(i) Give the two dyes that are mixed to make brown hair dye.
Answer:
green n yellow and white and black and white sq
Can anyone help me figure this out
Answer:
go with the fourth one because I did that one
Is Hibiscus tea good for ACNE?
Answer:
Y E S
Explanation:
Hibiscus tea has plenty of skin care qualities, from helping your natural levels of collagen and elastin to reducing breakouts to balancing oil production. Hibiscus is known for its rich level of antioxidants, including vitamin C and beta-carotene.
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