N₂O(g) + 3 H₂(g) N₂H4(1) + H₂O(1) AH = -317 kJ/mol
and standard heats of formation:
N₂O(g) +82.1 kJ/mol
H₂O(1) 285.8 kJ/mol.
What is the standard heat of formation of hydrazine (N₂H4(1)) ?
Select one:
O a. 50.9 kJ/mol
O b. - 520.7 kJ/mol
O c. 113.3 kJ/mol
O d. - 50.9 kJ/mol
e. 113.3 kJ/mol
Answers
Answer:
A
Explanation:
Recall that ΔH is the sum of the heats of formation of the products minus the heat of formation of the reactants multiplied by their respective coefficients. That is:
[tex]\displaystyle \Delta H^\circ_{rxn} = \sum \Delta H^\circ_{f} \left(\text{Products}\right) - \sum \Delta H^\circ_{f} \left(\text{Reactants}\right)[/tex]
Therefore, from the chemical equation, we have that:
[tex]\displaystyle \begin{aligned} (-317\text{ kJ/mol}) = \left[\Delta H^\circ_f \text{ N$_2$H$_4$} + \Delta H^\circ_f \text{ H$_2$O} \right] -\left[3 \Delta H^\circ_f \text{ H$_2$}+\Delta H^\circ_f \text{ N$_2$O}\right] \end{aligned}[/tex]
Remember that the heat of formation of pure elements (e.g. H₂) are zero. Substitute in known values and solve for hydrazine:
[tex]\displaystyle \begin{aligned} (-317\text{ kJ/mol}) & = \left[ \Delta H^\circ _f \text{ N$_2$H$_4$} + (-285.8\text{ kJ/mol})\right] -\left[ 3(0) + (82.1\text{ kJ/mol})\right] \\ \\ \Delta H^\circ _f \text{ N$_2$H$_4$} & = (-317 + 285.8 + 82.1)\text{ kJ/mol} \\ \\ & = 50.9\text{ kJ/mol} \end{aligned}[/tex]
In conclusion, our answer is A.
Related Questions
measuring masses of the reactants (Reaction 2) Step 7
Answers
The rate of reaction can be observed by watching the disappearance of a reactant or the appearance of a product over time.
If a reaction produces a gas such as oxygen or carbon dioxide, there are two ways to measure the reaction rate: using a gas syringe to measure the gas produced, or calculating the reduction in the mass of the reaction solution.
If the reaction produces a precipitate, the amount formed can be used to determine reaction rate by measuring how long it takes for the forming precipitate to obscure the visibility of a cross through a conical flask.
What is the pH of a solution with a pOH=6.31?
Answers
Answer:
pH= 2.199971 is the correct answer of given statement
Assume that the half-life of an M&M is 15 seconds A. you start with M& M's, how many would be left unchanged after 1 minute? Show all work below
Answers
Answer:
See below
Explanation:
1 minute is 4 halflives ( because 4 x 15 sec = 1 minute)
(1/2)^4 = 1/16
you will have 1/16 as many M&M as you started
A 53.8 g sample is burned in a bomb calorimeter. If the temperature rose from 32.0 oC to 56.0 oC and the heat capacity of the calorimeter is 13.3 kJ/oC, what is the value of ΔHrxn (in kJ/mole of sample)? The molar mass of the sample is 56.23 g/mol.
Answers
Based on the heat absorbed by the calorimeter, the heat of reaction, ΔHrxn is 333.5 kJ/mol
What is the heat evolved by the sample?The heat evolved or given out by the sample is the equal to the amount of heat absorbed by the calorimeter.
The heat absorbed by calorimeter is given as:
Heat = specific heat capacity × temperature differenceHeat = 13.3 × (56.0 - 32.0)
Heat evolved = 319.2 kJ
Moles of sample reacted = 53.8/56.23 = 0.957
ΔHrxn = 319.2 kJ/0.957 moles = 333.5 kJ/mol
Therefore, the heat of reaction, ΔHrxn is 333.5 kJ/mol.
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Which combination of reactants will cause a reaction? Choose all that apply.
NaCl and Fe
Br2 and KI
Mg and AlCl3
Zn and CuCl2
Answers
Answer:
mass of sodium hydroxide is needed to react completely with 10.0 g of iron(III) chloride
Explanation:
2. Which is not true of an electric current?
A. An electric circuit provides a path for electric current to follow.
B. Electric current exists in all materials.
C. Electric current requires a specific path to follow.
D. If an electric circuit is broken, electric current will not flow.
Answers
What is the distinguishing characteristic of invertebrates?
Group of answer choices
Specialized tissues and organ systems
The lack of a centralized brain
The lack of a spinal column
Being an insect
Answers
The lack of a spinal column is the distinguishing characteristic of invertebrates.
What is an Invertebrate?These are organisms which lack a backbone(vertebral column) while vertebrates on the other hand have it.
This is why option C was chosen as the most appropriate choice in this scenario.
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If you have 155 mL solution of a 0.762 M FeCl3 solution, how many
moles of FeCl3 are contained in this sample?
Answers
Moles are the product of the molar concentration and the volume of the solution. The moles of Ferric chloride is 0.118 moles.
What are moles?Moles are the smallest unit of the measurement of atoms and molecules. It is calculated by the molar concentration and the volume of the solution.
Given,
Molar concentration of ferric chloride = 0.762 M
Volume of solution = 0.155 L
Moles are calculated as:
[tex]\begin{aligned} \rm Moles &= \rm Molarity \times Volume (L) \\\\&= 0.762 \times 0.155\\\\&= 0.118\;\rm mol\end{aligned}[/tex]
Therefore, 0.118 moles of ferric chloride are present in the sample.
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Additional purchases may be added in open-end credit.
True
False
Answers
Migration is _______. a. the movement of organisms from a native location to a foreign location b. the movement of organisms from a foreign location to a native location c. the movement of organisms from their water supply to their food supply d. the seasonal movement of organisms between locations Please select the best answer from the choices provided A B C DMigration is _______. a. the movement of organisms from a native location to a foreign location b. the movement of organisms from a foreign location to a native location c. the movement of organisms from their water supply to their food supply d. the seasonal movement of organisms between locations Please select the best answer from the choices provided A B C D
Answers
Answer:
A
Explanation:
Answer:
D is the correct answer. the seasonal movement of organisms between locations
What is the final temperature of a system if 18.00 g of gold at 90.0°C is placed in 18.00 g of water at 26.00°C? The molar heat capacity of gold is 25.41
J/(mol • °C) and the heat capacity of water is 4.18 J/g. °C).
Answers
Given,
Molar heat capacity of gold is 25.41 J/(mol • °C)
Heat capacity of water is: 4.18 J/g. °C)
use the capacities to calculate the resultant temperature of the system using the mass of 18 grams of gold alongside 18 grams of water.
Hope This Helped!
write any five prevention of cancer
Answers
Answer:
Don't use tobacco or tobacco-containing products
Maintain a healthy diet
Protect yourself from the sun, make sure to use sunscreen
Go to the doctor regularly, for general checkups
Stay physically active
Explanation:
hope this helps :)
what coefficient would balance the following equation ch4+_O2--> CO2+2H2O
Answers
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
The balanced chemical equation for the shown reaction is :
[tex]\qquad \tt \:CH_4 + 2 \: O_2 \rightarrow CO_2 + 2 \: H_2O[/tex]
Where, coefficient of
[tex] \textsf{CH4 is 1} [/tex][tex] \textsf{O2 is 2} [/tex][tex] \textsf{CO2 is 1} [/tex][tex] \textsf{H2O is 2} [/tex]do we need greenhouse gases? explain.
Answers
Answer: Yes, we need greenhouse gases. Greenhouse gases are important because they sustain a healthy temperature on our planet. Greenhouse gases absorb heat from the sun and keep it in the atmosphere. The heat emitted by the Earth would pass outwards from its surface into space if greenhouse gases were not active. However, greenhouse gases aren’t just important. They can cause harmful consequences to our environment, too. Letting greenhouse gases into our air causes climate change and respiratory diseases from smog and air pollution.
Explanation:
Ca (s) + 02 (g) 2CaO (s)
O A. 4,1,2
O B. 3,1,2
• C. 2,1,2
O D. 1,1,2
Answers
Answer:
The answer is C.2,1,2
Explanation:
The reason why the answer is C.2,1,2 is because if you put a 2 Infront of the first calcium it will be balanced with the calcium in the product side and if you put one in front of the oxygen that wiil be two and it will also be balanced with the oxygen on the product side and seeing that a 2 the coefficient is already on the product side the equation is already balanced
Answer:
C. 2,1,2
Explanation:
Ca(s) + O₂ (g) →2CaO(s)
on the reactants side:
1 Ca
2 O (because the subscript 2 counts as there being 2 O molecules. if you put a 2 in front of the O₂ that would be 2x2=4)
On the product side:
2Ca
2O
you would just need to add a 2 to the Ca on the reactants side to balance the equation.
I hope this helps!
What is the mole fraction of Ca3(PO4)2 by dissolving 126.32 g of calcium phosphate, Ca3(PO4)2, in 850 grams of H2O?
Answers
Based on the total moles of substance in the solution, the mole fraction of Ca3(PO4)2 is 0.0086
What is mole fraction?Mole fraction is the fractions of the moles of a substance present in a given total moles of a mixture.
The mole fraction = moles of substance/total moles of mixtureMoles of Ca3(PO4)2 is calculated first:
Moles of Ca3(PO4)2 = mass/molar mass
molar mass of Ca3(PO4)2 = 310 g
Moles of Ca3(PO4)2 = 126.32/310 = 0.41
Moles of water = 850/18 = 47.22
Total moles = 47.63
Mole fraction of Ca3(PO4)2 = 0.41/47.22 = 0.0086
Therefore, the mole fraction of Ca3(PO4)2 is 0.0086
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what is the heat of fusion of water in calories per mole? Answer with explanation
Answers
Answer:
1436.2 calories per mole H2O
Explanation:
one mole of water has mole weight of 2 * H + O =
2 * 1.008 + 15.999 = 18.015 gm
the heat of fusion for water (the heat required to turn ice to water )
is 79.72 cal/gm
18.015 gm * 79.72 cal/gm = 1436.2 cal
Why is it necessary to determine if a reactant is limiting reagent in a
reaction?
A. Different products will start being formed once the limiting
reagent is gone.
B. The reaction will not happen if one of the reagents is a limiting
reagent.
C. Stoichiometry cannot be used to calculate amounts if there is a
limiting reagent.
D The amount of product formed will be limited by the amounbof the
limiting reagent.
Answers
Answer:
D
Explanation:
Hi!
Let's say you have 2 different reactants, A and B, and 1 product, C.
2A + 4B -> 3C
Let's say that once we do the calculations, we find that A is the limiting reactant/reagent.
All of the A is used up in the reaction, leaving behind some excess B, and forming C.
Now that there is only B left behind, it has nothing to react with, so it cannot create any more product.
I hope this helps!
What might be the result of removing a top predator from a marine biome?
A: Fish Become Over Populates
B: There is no effect on the Biome
C: The Ocean becomes more polluted
D: A Prey Animal Becomes the top predator
Answers
Answer:
A
Explanation:
Due to the fact that no one will eat the fish, their population starts growing.
Guess which one. It’s not B or D btw.
Answers
Answer: A
Explanation:
I took this test its A
why does the moon and the earth have the same mass
Answers
Answer:
Moon rocks contain few volatile substances (e.g. water), which implies extra baking of the lunar surface relative to that of Earth. The relative abundance of oxygen isotopes on Earth and on the Moon are identical, which suggests that the Earth and Moon formed at the same distance from the Sun.
Explanation:
Answer:
They DON"T have the same mass !
Explanation:
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what are the common diseases that are
found in poultry ?
Answers
Answer:
Diseases of Poultry
a. ESCHERICHIA COLI INFECTIONS.
b. SALMONELLOSES.
c. PARATYPHOID INFECTIONS.
d. FOWL CHOLERA.
e. RIEMERELLA ANATIPESTIFER INFECTIONS.MYCOPLASMA.
f. NECROTIC ENTERITIS.
g. CHOLANGIOHEPATITIS IN BROILER CHICKENS.
Explanation:
Answer:
◎Bacterial diseases
◎Mycoplasmosis (CRD, Air sac, Sinusitis)
◎Fowl Cholera
◎Necrotic Enteritis
◎Ulcerative Enteritis (Quail disease)
◎Pullorum Disease
◎Fowl
◎Botulism
◎Infectious Coryza
◎Omphalitis
◎Erysipelas
◎Parasitic diseases (internal)
◎Parasitic diseases (external)
◎Infectious Bronchitis
◎Viral diseases
◎Newcastle Disease
◎Quail Bronchitis
◎Lymphoid Leukosis
◎Marek's Disease (Visceral Leukosis)
◎Infectious Bursal Disease (Gumboro)
Explanation:
:)
Isocyanic acid, also known as Hydrogen cyanate, is a weak acid and a potentially toxic atmospheric pollutant. Write down the equation for the dissociation of isocyanic acid in water. Explain the term conjugate base and state the correct conjugate base of isocyanic acid. Give a reason for your answer.
Answers
The dissociation of isocyanic acid in water produces its conjugate base, C N- since it will accept a proton to form isocyanic acid.
What is a conjugate base?A conjugate base is a substance which is formed from the loss of the hydrogen ion of an acid and which will act as a base by accepting a proton.
The dissociation of Isocyanic acid in water is given below:
[tex]HC N + H_2O \rightleftharpoons C N^{-} + H_3O^{+}[/tex]
The conjugate base is C N- since it will accept a proton to form isocyanic acid.
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How much energy is needed to completely boil a 5.05g sample of water?
Answers
Given what we know, we can confirm that the amount of heat energy that would be required in order to boil 5.05g of water is that of 11.4kJ of heat.
Why does it take this much energy to boil the water?We arrive at this number by taking into account the energy needed to boil 1g of water to its vaporization point. This results in the use of 2260 J of heat energy. We then take this number and multiply it by the total grams of water being heated, in this case, 5.05g, which gives us our answer of 11.4 kJ of energy required.
Therefore, we can confirm that the amount of heat energy that would be required in order to boil 5.05g of water is that of 11.4kJ of heat.
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pls help me with thiss
Answers
Answer:
D. Large body of lava
Explanation:
hope this helps please mark me brainless
What is the product of photosynthesis that plants make as a source of energy for their life functions? What role does this substance have in your life?
Answers
Answer:
Glucose. Also provides heat and energy in man
Explanation:
I hope this right if ain't I'm sorry
Select the correct structure that
corresponds to the name.
4-octyne
A. CH3CH₂CH₂C = CCH₂CH₂CH3
-CEC-
B.
C. both
Answers
Answer:
ugh this wont save anyway i think i'm just checking if ill save
Explanation:
if i does C both
hope this helps
The correct selection for 4-octyne structure is A. Hence option A is correct.
What is Molecule and atom ?Atom is smallest entity of a body. Body is made up of atoms. it is basic building block of a body. An atom consist of electrons, protons and neutrons as sub atomic particle. whole mass of the atom is concentrated at the center of the atom which we call it as nucleus, nucleus consist of proton and neutron. Electron revolve around the nucleus at determined(fixed) orbit. Total number of protons in the atom decides the atomic number and the elements in the periodic table.
Molecule is made up of atoms, it is formed when two or more atoms bound together. The electrons in the outermost orbit are responsible for the molecule formation. Electrons are shared by the atoms in the entire molecule.
4-Octyne, also known as dipropylethyne, is a type of alkyne with a triple bond at its fourth carbon. its chemical formula is C₈H₁₄.
C₈H₁₄ are bounded like . CH₃CH₂CH₂-C ΞC-CH₂CH₂CH₃
Hence option A is correct.
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On a long bus trip, a traveler does
not drink
any water for several hours. How
will the volume of urine she produces that day
compare to the volume on a day when she
drinks several glasses of water? Explain.
Answers
Answer:
The volume will be less.
Explanation:
The volume of urine someone produces varies based on their liquid intake. The more liquid you intake, the more you must urinate (not a direct correlation, but basically).
For a certain reaction with an average percentage yield of 80 %; if the theoretical yield was 5.0 g then the actual yield will be ?
Answers
The actual yield of the reaction is 4.0 g, given that the percent yield of the reaction us 80% and the theoretical yield is 5.0 g.
What is percent yield of a reaction?The percent yield of a reaction is the amount of actual product obtained from a reaction taken as a ratio of the expected amount of product expressed in percentage.
Percent yield = actual yield/theoretical yield × 100%Given that the percent yield of the reaction us 80% and the theoretical yield is 5.0 g.
Actual yield = 80% × 5.0 = 4.0 g
Therefore, the actual yield of the reaction is 4.0 g.
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What is the frequency of a radio wave with a a wavelength of 3 m? (Hint: MHz
stands for megahertz or 1 million hertz)
A. 100 MHz (1 x 108 HZ)
B. 10 MHz (1 x 10 Hz)
C. 1 MHz (1 x 105 Hz)
D. 1000 MHz (1 x 10° Hz)
Answers
Answer:
a. 1 x 10^8
Explanation:
100 MHz = 100,000,000 Hz = 10^8 Hz