Answer:
1.) 2 Fe (s) + 3 Cl₂ (g) ---> 2 FeCl₃ (aq)
2.) 2.0 moles FeCl₃
3.) 0.67 moles FeCl₃
4.) 1.5 g FeCl₃
Explanation:
1.)
The unbalanced reaction:
Fe (s) + Cl₂ (g) ---> FeCl₃ (aq)
Reactants: 1 iron, 2 chlorine
Products: 1 iron, 3 chlorine
The balanced reaction:
2 Fe (s) + 3 Cl₂ (g) ---> 2 FeCl₃ (aq)
Reactants: 2 iron, 6 chlorine
Products: 2 iron, 6 chlorine
2.)
To find moles FeCl₃, you need to multiply the given value by the mole-to-mole ratio of Fe to FeCl₃. This ratio is constructed via the coefficients from the balanced equation.
2.0 moles Fe 2 moles FeCl₃
--------------------- x ------------------------ = 2.0 moles FeCl₃
2 moles Fe
3.)
To determine how much FeCl₃ is produced, you need to identify the limiting reagent. To find it, you need to convert both reactants to the product then identify which reactant gives you the smallest amount of product. This reactant is the limiting reagent and will give you your actual answer.
1.0 mole Fe 2 moles FeCl₃
------------------- x ----------------------- = 1.0 moles FeCl₃
2 moles Fe
1.0 mole Cl₂ 2 moles FeCl₃
------------------- x ------------------------ = 0.67 moles FeCl₃
3 moles Cl₂
4.)
Because Cl₂ is the limiting reagent, we need to convert grams Cl₂ to grams FeCl₃. This can be done using the molar masses of both compounds and the mole-to-mole ratio.
Molar Mass (Cl₂): 2(35.453 g/mol)
Molar Mass (Cl₂): 70.906 g/mol
Molar Mass (FeCl₃): 55.845 g/mol + 3(35.453 g/mol)
Molar Mass (FeCl₃): 162.204 g/mol
1.0 g Cl₂ 1 mole 2 moles FeCl₃ 162.204 g
------------- x ----------------- x ----------------------- x ------------------ = 1.5 g FeCl₃
70.906 g 3 moles Cl₂ 1 mole
The rate constant, k, for a reaction is 0.0354 sec1 at 40°C. Calculate the rate constant for the
same reaction at 125°C if the activation energy is 26.5 kJ/mol.
Answer:
The rate constant of the reaction at 125˚ is [tex]0.3115 \ \text{sec}^{-1}[/tex].
Explanation:
The Arrhenius equation is a simple equation that describes the dependent relationship between temperature and the rate constant of a chemical reaction. The Arrhenius equation is written mathematically as
[tex]k \ = \ Ae^{\displaystyle\frac{-E_{a}}{RT}}[/tex]
[tex]\ln k \ = \ \ln A \ - \ \displaystyle\frac{E_{a}}{RT}[/tex]
where [tex]k[/tex] is the rate constant, [tex]E_{a}[/tex] represents the activation energy of the chemical reaction, [tex]R[/tex] is the gas constant, [tex]T[/tex] is the temperature, and [tex]A[/tex] is the frequency factor.
The frequency factor, [tex]A[/tex], is a constant that is derived experimentally and numerically that describes the frequency of molecular collisions and their orientation which varies slightly with temperature but this can be assumed to be constant across a small range of temperatures.
Consider that the rate constant be [tex]k_{1}[/tex] at an initial temperature [tex]T_{1}[/tex] and the rate constant [tex]k_{2}[/tex] at a final temperature [tex]T_{2}[/tex], thus
[tex]\ln k_{2} \ - \ \ln k_{1} = \ \ln A \ - \ \displaystyle\frac{E_{a}}{RT_{2}} \ - \ \left(\ln A \ - \ \displaystyle\frac{E_{a}}{RT_{1}}\right) \\ \\ \\ \rule{0.62cm}{0cm} \ln \left(\displaystyle\frac{k_{2}}{k_{1}}\right) \ = \ \displaystyle\frac{E_{a}}{R}\left(\displaystyle\frac{1}{T_{1}} \ - \ \displaystyle\frac{1}{T_{2}} \right)[/tex]
[tex]\rule{1.62cm}{0cm} \displaystyle\frac{k_{2}}{k_{1}} \ = \ e^{\displaystyle\frac{E_{a}}{R}\left(\displaystyle\frac{1}{T_{1}} \ - \ \displaystyle\frac{1}{T_{2}} \right)} \\ \\ \\ \rule{1.62cm}{0cm} k_{2} \ = \ k_{1}e^{\displaystyle\frac{E_{a}}{R}\left(\displaystyle\frac{1}{T_{1}} \ - \ \displaystyle\frac{1}{T_{2}} \right)}[/tex]
Given that [tex]E_{a} \ = \ 26.5 \ \ \text{kJ/mol}[/tex], [tex]R \ = \ 8.3145 \ \ \text{J mol}^{-1} \ \text{K}^{-1}[/tex], [tex]T_{1} \ = \ \left(40 \ + \ 273\right) \ K[/tex], [tex]T_{2} \ = \ \left(125 \ + \ 273\right) \ K[/tex], and [tex]k_{1} \ = \ 0.0354 \ \ \text{sec}^{-1}[/tex], therefore,
[tex]k_{2} \ = \ \left(0.0354 \ \ \text{sec}^{-1}\right)e^{\displaystyle\frac{26500 \ \text{J mol}^{-1}}{8.3145 \ \text{J mol}^{-1} \ \text{K}^{-1}}\left(\displaystyle\frac{1}{313 \ \text{K}} \ - \ \displaystyle\frac{1}{398 \ \text{K}} \right)} \\ \\ \\ k_{2} \ = \ 0.3115 \ \ \text{sec}^{-1}[/tex]
. Use the following reaction to determine how much of each product would be released if 42 000 kg (42 tonnes) of methyl isocyanate reacted with excess water:
The amount of 1,3-dimethyl urea produced would be 32,458 grams or 32.458 kg while that of carbon dioxide would be 16,214 grams of 16.214 kg
Stoichiometric problemFrom the equation of the reaction, the mole ratio of methyl isocyanate with the products is 2:1 respectively.
Mole of 42,000 kg of methyl isocyanate = 42000/57 = 736.84 moles
Equivalent mole of 1,3-dimethyl urea = 736.84/2 =368.42 moles
Equivaent mole of carbon dioxide = 736.84/2 =368.42moles
Mass of 368.42 moles 1,3-dimethyl urea = 368.42 x 88.1 = 32,458 grams or 32.458 kg
Mass of 368.42 moles of carbon dioxide = 368.42 x 44.01 = 16,214 grams of 16.214 kg
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In the following reaction, how much heat is
generated when 1.83 moles of CH4 are
burned?
CH4 (g) + 2 O₂ (g) → CO₂ (g) + 2 H₂O(g) Hº
= -802 kJ/mol
| KJ
Answer:
1470 kJ (to 3 sf)
Explanation:
(802)(1.83) = 1470 kJ (to 3 sf)
help pls i dont get it
The experiment seeks to find out if the seeds take up oxygen as they germinate.
What is an experiment?An experiment is carried out in order to determine cause and effect relationships. The independent variable is the variable that is manipulated in the experiment.
a. The set up B is the control set up
b. The independent variable is the presence/ absence of the seeds while the dependent variable is the color of the solution in both containers.
c. The amount of oxygen in each container can be measured before and after.
d. The hypothesis is that the seeds take up oxygen as they germinate.
Hence, the experiment seeks to find out if the seeds take up oxygen as they germinate.
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Be sure to answer all parts.
The pH of a saturated solution of a metal hydroxide M(OH)2 is 10.900. Calculate the Ksp for this compound.
Enter your answer in scientific notation.
The Ksp of the solution is 1.97 * 10^-9.
What is the pH?The pH is defined as the hydrogen ion concentration of the solution. Now we have the pH of the solution as 10.9.
We know that;
pOH = 14 - pH
pOH = 14 - 10.9
pOH = 3.1
[OH^-] = Antilog [-3.1]
[OH^-] =7.9 * 10^-4 M
Now
Ksp = [M^2+] [2OH^-]^2
Ksp = s * (2s)^2
Ksp = 4s^3
Now s = 7.9 * 10^-4 M
Ksp = 4(7.9 * 10^-4)^3
Ksp = 1.97 * 10^-9
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What is the volume of 6.40 grams of O₂ gas at STP?
O 4.49 liters
O 4.32 liters
04.18 liters
O 4.06 liters
The volume of 6.40 grams of O₂ gas at STP is 4.48L (option A). Details about volume can be found below.
How to calculate volume?The volume of a gas can be calculated using the following formula:
p = m/v
Where;
p = densitym = massv = volumeAccording to this question, the mass of O₂ gas at STP is 6.40 grams. The density of the gas at STP is 1.43 g/L.
1.43g/L = 6.4g/V
Volume of O2 = 6.4 ÷ 1.43 = 4.48L
Therefore, the volume of 6.40 grams of O₂ gas at STP is 4.48L.
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Answer:
This is right!!! the answer is A 4.49
Explanation:
How many molecules of HCI would react with 2 moles of Al?
2AI + 6HCI-2AICI 3
+ 3H₂
From the coefficients of the equation, we know that for every 2 moles of Al consumed, 6 moles of HCl are consumed.
This means 6(2/2)=6 moles of HCl are needed.
Since there are [tex]6.022 \times 10^{23}[/tex] molecules in 1 mole of a substance, there are :
[tex]6(6.022 \times 10^{23}}=\boxed{4 \times 10^{24} \text{ (to 1 sf)}}[/tex]
round off 318.90 to 2 significant figures
Answer:
320
Explanation:
Because the question is asking for 2 significant figures, you want to try to get rid of all of the numbers to the right of the 1. That way, the only numbers that will be significant are the numbers in the position of the 3 and the 1.
Before you can make the rest of the numbers equal 0, you need to correctly round the number in the last significant position (the number 1).
If the number to the right of the 1 is from 0-4, the number stays the same. If the number is from 5-9, the 1 needs to be increased by a unit.
Since the number to the right is an 8, you need to change the 1 to a 2. Now, you can make all of the other numbers a 0. There should be no decimal place because it would mean that the zero to the left of it is significant.
Question 14 of 32
What is the equilibrium expression for the reaction below?
C(s) + O₂(g)CO₂(g)
Ο Α.
OB.
O C.
OD.
[0₂][C]
[CO₂]
[CO₂]
[0₂]
[CO₂]
[0₂][C]
1
The equilibrium expression for the reaction; C(s) + O₂(g) ------->CO₂(g) is [CO2]/[C] [O2] option C.
What is the equilibrium expression?The equilibrium expression shows how much of the reactants are converted into products. If the equilibrium constant is large and positive, most of the reactants have been converted into products.
Thus, the equilibrium expression for the reaction; C(s) + O₂(g) ------->CO₂(g) is [CO2]/[C] [O2] option C.
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At a temperature of 11.5 °C the gas occupies a volume of 0.0141 m³. Calculate the volume the gas occupies when the temperature is raised to 95.0 °C.
Taking into account the Charles's law, the gas occupies a volume of 0.0182 m³ when the temperature is raised to 95.0 °C.
Charles's lawCharles's law shows the relationship between the volume and temperature of a gas sample at constant pressure.
This law states that the volume is directly proportional to the temperature of the gas: if the temperature increases, the volume of the gas increases, while if the temperature of the gas decreases, the volume decreases.
Mathematically, Charles' law is a law that says that when the amount of gas and pressure remain constant, the ratio between volume and temperature will always have the same value:
[tex]\frac{V}{T}= k[/tex]
Considering an initial state 1 and an initial state 2:
[tex]\frac{V1}{T1}= \frac{V2}{T2}[/tex]
Volume in this caseIn this case, you know:
V1= 0.0141 m³T1= 11.5 C= 284.5 K (being 0 C= 273 K)V2= ?T2= 95 C= 368 KReplacing in Charles's Law:
[tex]\frac{0.0141 m^{3} }{284.5 K}=\frac{V2}{368 K}[/tex]
Solving:
[tex]\frac{0.0141 m^{3} }{284.5 K}x368 K=V2[/tex]
0.0182 m³= V2
Finally, the gas occupies a volume of 0.0182 m³ when the temperature is raised to 95.0 °C.
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Is the spectrum
electromagnetic
of an element limited only to the visible region of the
spectrum?
The electromagnetic spectrum of an element is not limited only to the visible region of the spectrum.
What is an electromagnetic spectrum?An electromagnetic spectrum is a range of frequencies and wavelengths into which an electromagnetic wave is distributed into.
In Science, the electromagnetic spectrum consist of the following types of energy from highest to lowest frequency and shortest to longest wavelength:
Gamma raysX-raysUltraviolet radiationVisible lightInfrared radiationMicrowavesRadio wavesIn this context, we can infer and logically deduce that the electromagnetic spectrum of an element is not limited only to the visible region of the spectrum.
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0.350g of an organic compound gave 100ml of Nitrogen collected at
250K temperature and 700mm pressure. Calculate the percentage
composition of Nitrogen in the compound.
Use Dumas method
The percentage composition of Nitrogen in the compound is 35.71%
How to determine the mole of nitrogenVolume (V) = 100 mL = 100 / 1000 = 0.1 LPressure (P) = 700 mmHg Temperature (T) = 250 KGas constant (R) = 62.364 torr.L/Kmol Number of mole (n) =?Using the ideal gas equation, the mole of nitrogen can be obtained as follow
PV = nRT
n = PV / RT
n = (700 × 0.1) / ( 62.364 × 250)
n = 0.00448 mole
How to determine the mass of nitrogenMole of nitrogen = 0.00448 moleMolar mass of nitrogen = 28 g/molMass of nitrogen = ?Mass = mole × molar mass
Mass of nitrogen = 0.00448 × 28
Mass of nitrogen = 0.125 g
How to determine the percentage of nitrogenMass of nitrogen = 0.125 gMass of compound = 0.35 gPercentage of nitrogen =?Percentage = (mass of element / mass of compound) × 100
Percentage of nitrogen = (0.125 / 0.35) × 100
Percentage of nitrogen = 35.71%
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calculate the mass in grams of the sample
Answer:
3666.33 gm
Explanation:
O3 mole mass = 47.997
Each mole has 6.022 x 10^23 molecules
4.6 x 10^25 / 6.022 x 10^23 x 47.997 gm/mole = 3666.33 gm
1. A fluid is a substance that (a) always expands until it fills any container; (b) is practically incompressible; (c) cannot be subjected to shear forces; (d) cannot remain at rest under action of any shear force.
Answer:
cannot remain at rest under the action of any shear force.
Sodium tungstate is Na₂WO4. Therefore, the formula for gold(III) tungstate is
Answer:
AuW₃
Explanation:
I need help with homework
Answer:
1. H₂SO₄
Explanation:
A balanced equation tells us how each reactant and product is related to each other in terms of moles.
The equation given has already been balanced since the number of atoms of each element is the same on both sides of the arrow. From the equation, we can see that 1 mole of H₂SO₄ reacts with 2 moles of NaOH. Whichever reactant that we do not have enough of to make more products is known as the limiting reagent, since it limits the amount of products formed.
Mole ratio of H₂SO₄: NaOH= 1: 2
The amount of NaOH needed is twice the amount of H₂SO₄ in terms of moles.
Given that there are 0.40 moles of H₂SO₄, let's calculate the amount of NaOH needed.
Amount of NaOH needed
= 2(0.40)
= 0.80 moles
However, there are only 0.75 moles of H₂SO₄. Since 0.75 <0.80, H₂SO₄ is the limiting reactant.
Additional:
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Answer:
See below
Explanation:
From the balanced equation you can see you need twice as many moles of NaOH as H2SO4....
you have .4 moles of H2SO4 so you need .8 moles of NaOH
but you only have .75 mole....so NaOH is the limiting factor (because you do not have enough)
Question 1
Predict if the bonds formed between the following pairs of elements will be ionic, polar covalent, or
covalent.
Si and O
O and O
C and H
Li and F
Ba and S
Polar Covalent
Covalent
Covalent
lonic
loric
The following types of bonds exists between the listed atoms;
Si and O - polar covalentO and O - CovalentC and H - CovalentLi and F - ionicBa and S - ionicWhat is a polar covalent bonds?A bond is polar covalent when the electronegativity difference between the bonding atoms is above that found in a nonpolar covalent bond. Now we shall see the types of bonds between these atoms.
Si and O - polar covalentO and O - CovalentC and H - CovalentLi and F - ionicBa and S - ionicLearn more about polar covalent bonds:https://brainly.com/question/10777799
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A gas expands and does PV work on its surroundings equal to 322 J. At the same time, it absorbs 132 J of heat from the surroundings. Calculate the change in energy of the gas. Note: PV work means work done by a changing volume against constant pressure. Enter your answer in scientific notation.
From the calculations, the change in energy is - 190 J.
What is the first law of thermodynamics?From the first law of thermodynamics, the energy is neither created nor destroyed but is transformed from one form to another.
From the law;
U = q + w
U = internal energy
q = heat
w = work
Since work is done on the surroundings and the gas absorbs heat then;
U = 132 J - 322 J
U = - 190 J
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Is KI + AgNO3 make potassium nitrate ?
Answer:
AgNO3 + KI → AgI + KNO3
Explanation:
Yes, it's produced potassium nitrate
For the reaction: C → D + B the graph of ln k vs 1/T(K) gives the equation: y = -2.2x104x + 45.0. Using this information, calculate the activation energy, (J/mol)
From the equation of the graph, the activation energy of the reaction is -2.2 * 10⁴ J/mol.
What is activation energy?Activation energy is the minimum required energy that reactant molecules must possess for a reaction to proceed towards formation of products.
The activation energy is determined from the slope of ln k against 1/T(K).
Given the equation, y = -2.2 * 10⁴ x + 45.0.
Comparing with the equation of a straight line, y = mx + c
The gradient, m = -2.2 * 10⁴
Therefore, the activation energy of the reaction is -2.2 * 10⁴ J/mol.
In conclusion, reactant molecules must break the activation energy barrier in order to form products.
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Can Ionic bonds form single double or triple bonds?
Answer:
carbon molecules share their 4 valence electrons through single, double, and triple bonds.
Explanation:
I think you meant ionic bonds not lonic bonds
explain how adding soap to water affects the surface tension of water.
Answer:
The surface tension of water is high due to the dipole nature of water, meaning that the water molecules pull on each other by electrical charge. Soap and detergents interrupt this layer, reducing the surface tension.
A visual, though not scientifically accurate, would be a set of magnetic marbles that form a sheet. If you randomly stick in glass marbles the overall strength decreases since they are not all pulling together in order.
There are some substances, called super wetters, generally silicone surfactants that give a truly amazing drop in surface tension, where a small puddle of water can spread to many times it’s own size. These types of surfactants are used in laundry detergent and french fry oil to prevent foaming and in polymers to promote flow.
Hope it helps!
Please mark me as brainlist.
Answer:
The surface tension of water is high due to the dipole nature of water, meaning that the water molecules pull on each other by electrical charge. Soap and detergents interrupt this layer, reducing the surface tension.
A visual, though not scientifically accurate, would be a set of magnetic marbles that form a sheet. If you randomly stick in glass marbles the overall strength decreases since they are not all pulling together in order.
There are some substances, called super wetters, generally silicone surfactants that give a truly amazing drop in surface tension, where a small puddle of water can spread to many times it’s own size. These types of surfactants are used in laundry detergent and french fry oil to prevent foaming and in polymers to promote flow.
Explanation:
When calcium carbonate is added to hydrochloric acid, calcium chloride, carbon dioxide, and water are produced. caco3(s) 2hcl(aq)⟶cacl2(aq) h2o(l) co2(g) how many grams of calcium chloride will be produced when 27.0 g of calcium carbonate is combined with 14.0 g of hydrochloric acid?
21.1 grams of calcium chloride will be produced when 27.0 g of calcium carbonate is combined with 14.0 g of hydrochloric acid.
What is a limiting reagent?The reactant that is consumed first in a chemical reaction is the limiting reagent or limiting reactant because it stops any more reactions from taking place. The limiting reagent controls how much product is produced during the reaction.
CaCO3(s) + 2HCl(aq) ==> CaCl2(aq) + H2O(l) + CO2(g)
[tex]mols CaCO3 =[/tex] [tex]27 *\frac{1 mol}{100g}[/tex] = 0.27 mol
[tex]mols HCl = 15 gx \frac{1 mol}{36.5 g}[/tex] = 0.38 mol
Limiting reactant = HCl ( it takes 2x the mols of HCl compared to mols CaCO3 as per balanced equation)
mass of CaCl2 = [tex]0.411 mols HCl x\frac{ 1 mol CaCl2}{ 2 mols HCl } x 111.0 g/mol[/tex]
mass of CaCl2 = 21.1 g
Hence, 21.1 g of calcium chloride will be produced when 27.0 g of calcium carbonate is combined with 14.0 g of hydrochloric acid.
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Identify the following changes as physical or chemical. A loaf of risen but unbaked bread. Photo by Elinor D Bread dough rising: physical chemical
The answers include:
A loaf of risen but unbaked bread - chemical change.Photo by Elinor D - chemical change.Bread dough rising - chemical change.What is a Chemical change?
This involves the formation of a new products from substances. In this scenario, a rising bread contains alcohol which evaporates.
Photographs also fall under this category and is therefore an irreversible chemical change.
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An electron moved from shell n=2 to Shell n=1. What most likely happened during the transition
When an electron goes from a higher shell to a lower shell then it loses energy.
What is a photon?A photon is a particle of light defined as a discrete bundle (or quantum) of electromagnetic (or light) energy.
When an electron goes from a higher shell to a lower shell then it loses energy.
So, when an electron moved from shell n = 2 to shell n = 1 then a photon of energy is released.
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why is a gigantic iceberg have more heat energy than a pot of boiling water
Thermal energy depends not only on the temperature of a substance but also on the amount of it.
It may be helpful to think of this situation as looking for the total amount of molecular movement. The pot of boiling water has a lot of movement but only a few molecules. The iceberg has far less movement between molecules but vastly more of them.
With the size alone, the slight movements between the molecules of the iceberg add up immensely and tower over that same measurement on the pot of boiling water.
what are the hydrogen bonding atoms in melatonin?
The hydrogen bonding atoms in melatonin are phospholipids and cholesterol.
What is Hydrogen bonding?This is the type of interaction which involves a hydrogen atom being covalently bound to a more electronegative "donor".
Melatonin controls sleep-wake cycle and has phospholipids and cholesterol which have high affinity for hydrogen bonding.
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Determine the empirical formula of a compound containing 8.56 g silicone of 43.2 g of chlorine
The empirical formula of the compound is SiCl₄.
Empirical formula of the compoundmass of silicon = 28 g/mol
mass of chlorine = 35.5 g/mol
molar ration:Si = 8.56/28 = 0.306
Cl = 43.2/35.5 = 1.216
Combining ratioSi = 0.306/0.306 = 1
Cl = 1.216/0.306 = 4
empirical formula = SiCl₄
Thus, the empirical formula of the compound is SiCl₄.
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4NH 3+32 to 2 and 2+ 6H20 What is the mole ratio of NH3 to N2
The mole ratio would be 4:3
What is the mole ratio?Mole ratio is the ratio of the stoichiometric number of moles of components of reactions.
From the equation: [tex]4NH_3 + 3O_2 --- > 2N_2 + 6H_2O[/tex]
The mole ratio of [tex]NH_3[/tex] to that of [tex]N_2[/tex] is the ratio of their coefficients. The coefficients are 4 and 3 respectively
Thus, the ratio is 4:3.
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What are the social, cultural, and environmental in pacts of water in California