4.28 moles of nitrogen gas are generated by the complete reaction of 8.56 moles of ammonia.
To find out how many moles of nitrogen gas are generated by the complete reaction of 8.56 moles of ammonia, we can use the balanced chemical equation: 4NH3 + 3O2 → 2N2 + 6H2O.
Step 1: Identify the mole ratio between ammonia (NH3) and nitrogen gas (N2). From the balanced equation, we see that 4 moles of NH3 produce 2 moles of N2. This gives us a mole ratio of 4:2 or 2:1.
Step 2: Use the mole ratio to determine the moles of nitrogen gas produced. Since the mole ratio is 2:1, for every 2 moles of NH3 that react, 1 mole of N2 is produced.
Step 3: Calculate the moles of nitrogen gas generated from 8.56 moles of ammonia. Divide the given moles of ammonia by the mole ratio:
8.56 moles NH3 / 2 = 4.28 moles N2
Therefore, 4.28 moles of nitrogen gas are generated by the complete reaction of 8.56 moles of ammonia.
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A 200g piece of iron absorbs 8980 joules to raise the temperature from 20°C to 120°C. Find the specific heat of iron?
Answer:
The specific heat of iron is 0.449 J/g°C.
Explanation:
First, let's see the formula of specific heat:
\(c=\frac{q}{m\cdot\Delta T}\begin{cases}{q=amount\text{ of heat \lparen Joules\rparen}} \\ {m\text{ = mass of substance \lparen grams\rparen}} \\ \Delta T={Change\text{ of temperature \lparen\degree C\rparen}}\end{cases},\)Now, we have to replace the given data in the formula, where q = 8980 J, m = 200 g and ΔT = Final temperature - Initial temperature = 120 °C - 20 °C = 100 °C:
\(c=\frac{8980\text{ J}}{200\text{ g}\cdot100\degree C}=0.449\frac{J}{g\degree C}.\)The specific heat of iron is 0.449 J/g°C.
slippery solvent corporation has a new degreasing reagent that is supposed to be less toxic to the environment than their current degreasing agent. the expected intake from the air by workers for this solvent is 1 mg/kg/day and the reference dose (rfd) for pulmonary disease in humans is 10 mg/kg/day. this risk characterization of this solvent would be:
This risk characterization of this solvent can be that there is a risk because of the hazard quotient would be 0.1 mg/kg/day.
Use of toxic reagents usually have impacts on the environment which can be just devastating like killing organisms in a lake or river, destroying animals and plants in a contaminated area, causing major reproductive complications in animals and humans, or otherwise limit the ability of an ecosystem to survive.
Hazard quotient is basically described as the ratio of the potential exposure to a substance and the level at which no adverse effects are expected. It is primarily used by US EPA to assess the health risks of air toxics.
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What is produced during the replacement reaction of Cu(NO3)2 and Zn?
ZnNO3 + Cu
Zn + Cu(NO3)2
ZnCu + 2NO3
Zn(NO3)2 + Cu
Hello!
Cu(NO₃)₂+Zn→Zn(NO₃)₂+Cu
Answer: The answer is D, although I figure you're done with the test now
Explanation:
I was taking the unit test and happened to get the question right. And it's easier to type the letter choice than the whole answer out :)
(f) The reaction occurs in a rigid 4.3 L vessel at 25°C, and the total pressure is monitored, as shown in the graph above. The vessel originally did not contain any gas. Calculate the number of moles of CO₂(g) produced in the reaction. (Assume that the amount of CO₂(g) dissolved in the solution is negligible.)
According to the question the number of moles of CO₂(g) produced in the reaction is 1.18 mol.
What is moles?Moles are small, burrowing mammals found throughout much of the world. They are classified as insectivores, meaning they are specialized in eating insects. Moles have long, cylindrical bodies, short limbs, and large, clawed feet adapted for digging. Their fur is usually black to gray, though some species may have a light brown or yellowish color. They have small eyes and ears, and their noses are long and sensitive, used to detect prey and other objects in their environment.
The ideal gas law can be used to calculate the number of moles of CO₂(g) produced in the reaction. The ideal gas law states that PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is temperature.
Since the volume and temperature are known, we can rearrange the equation to solve for n:
n = PV/RT
At the beginning of the reaction, the pressure is 0 and the volume is 4.3 L, so the number of moles of CO₂(g) is 0.
At the end of the reaction, the pressure is 5 atm and the volume is still 4.3 L. Plugging these values into the equation gives us:
n = (5 atm)(4.3 L)/(0.08206 L·atm/mol·K)(298K) = 1.18 mol CO₂(g)
Therefore, the number of moles of CO₂(g) produced in the reaction is 1.18 mol.
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3. The presence of the same
a. fossils
b. rocks
on several continents supports the hypothesis of continental drift.
c. neither a norb
d. both a and b
Answer:
with someone or in the same place as them
Explanation:
which of the following atoms has a partially or completely filled (4f) subshell in its ground state configuration? a. pt b. xe c. ba d. tc e. cs
The atom with a partially or completely filled (4f) subshell in its ground state configuration is option a. Pt (platinum).
The (4f) subshell corresponds to the 4th energy level and the f orbital within that level. To determine which atom has a partially or completely filled (4f) subshell, we need to examine the electron configuration of each atom.
Option a. Pt (platinum) has the electron configuration [Xe] 4f^(14) 5d^(9) 6s^(1). The (4f) subshell is partially filled with 14 electrons.
Option b. Xe (xenon) has the electron configuration [Kr] 5s^(2) 4d^(10) 5p^(6). It does not have electrons in the (4f) subshell.
Option c. Ba (barium) has the electron configuration [Xe] 6s^(2). It does not have electrons in the (4f) subshell.
Option d. Tc (technetium) has the electron configuration [Kr] 5s^(2) 4d^(5). It does not have electrons in the (4f) subshell.
Option e. Cs (cesium) has the electron configuration [Xe] 6s^(1). It does not have electrons in the (4f) subshell.
Therefore, the atom with a partially or completely filled (4f) subshell in its ground state configuration is option a. Pt (platinum).
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How much energy is required to melt 2 kg of copper? Use the table below and
this equation: Q = mLfusion
A. 125.6 kJ
B. 9460 kJ
C. 414 kJ
D. 4730 kJ
Answer:
C. 414 kJ
Explanation:
Given parameters:
Mass of copper = 2kg
Unknown:
Amount of energy required to melt the copper = ?
Solution:
To solve this problem, we use:
Q = m L
m is the mass
L is the latent heat of fusion of copper = 207kJ/kg
So;
Q = 2 x 207 = 414kJ
4. Explain error and how it can impact your results from an experiment
Random errors will shift each measurement from its true value by a random amount and in a random direction. These will affect reliability (since they're random) but may not affect the overall accuracy of a result.
explain why the freezing of water into ice causes the cracks to widen
Answer:
The freezing of water into ice causes the cracks to widen because it occupy more space.
Explanation:
When the water change its state of liquid to solid state due to decrease in temperature, it contracts means occupy less space but when the temperature reaches to 4 degree Celsius, it starts to expand. When the temperature goes below 0 degree Celsius, it will cause more expansion and occupy more space that causes the cracks to widen.
How many moles of sulfur are in a 707 gram sample of sulfur?
a) 12.2 moles of sulfur
Ob) 52.1 moles of sulfur
c) 51.1 moles of sulfur
od) 22.1 moles of sulfur
d) 22.1 moles of sulfur
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableStoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
707 g S (Sulfur)
Step 2: Identify Conversions
Molar Mass of S - 32.07 g/mol
Step 3: Convert
Set up: \(\displaystyle 707 \ g \ S(\frac{1 \ mol \ S}{32.07 \ g \ S})\)Divide: \(\displaystyle 22.0455 \ mol \ S\)Step 4: Round
Our closest answer is d) 22.1 moles of sulfur
This is due to dividing different rounded values.
Answer:
\(\boxed {\boxed {\sf D. \ 22.1 \ moles \ of \ sulfur}}\)
Explanation:
To convert from moles to grams, we must use the molar mass. This can be found on the Periodic Table.
We are given a sample of sulfur. Look for the symbol S on the table.
Sulfur (S): 32.07 g/molThis tells us the mass of 1 mole of sulfur. Use this molar mass as a ratio.
\(\frac{32.07 \ g \ S}{1 \ mol \ S }\)
Multiply by the given number of grams (707).
\(707 \ g \ S *\frac{32.07 \ g \ S}{1 \ mol \ S }\)
Flip the fraction so the grams of sulfur will cancel out.
\(707 \ g \ S *\frac{ 1 \ mol \ S }{32.07 \ g \ S}\)
\(707 *\frac{ 1 \ mol \ S }{32.07 }\)
\(\frac{ 707 \ mol \ S }{32.07 }\)
\(22.0455254 \ mol \ S\)
The number we caluclated is the closest to answer choice D: 22.1 moles of sulfur
. 11 gallons of gasoline for $26.29
or 6 gallons of gasoline for $14.45?
Answer:
6 gallons of gasoline for $14.45 is the best price
Explanation:
26.29/11=2.39 $ per gallon
14.45/11=1.31 $ per gallon
help me give 5 stars
why must air bubbles be expelled from the burette tip
Expelling air bubbles from the burette tip is crucial for accurate titration experiment measurements, as they can cause errors in final readings, affecting concentration and molarity calculations.
Air bubbles must be expelled from the burette tip during a titration experiment to ensure accurate measurement of the volume of the titrant used. In other words, it is important to eliminate air bubbles from the burette tip in a titration experiment as they may cause an error in the final reading. If the burette has air bubbles, it can lead to a false reading, which will be inaccurate. The presence of air bubbles in the burette tip increases the volume of the burette, leading to an inaccurate volume of titrant used. As a result, this can change the calculated concentration of the solution being titrated, which will also lead to an incorrect molarity calculation.
Therefore, it is crucial to expel all air bubbles from the burette tip before titration to ensure accurate measurement of the volume of titrant used.
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4Fe + 3O2 —-> 2Fe2O3
How many grams of iron(Fe) and oxygen gas(O2) reacted to form 65.6 grams of Fe2O3
46.03 grams of iron and 19.75 grams of oxygen gas reacted to form 65.6 grams of Fe2O3.
What is Moles?
In chemistry, a mole is a unit of measurement that represents a certain amount of a substance. One mole of any substance is equal to 6.022* \(10^{23}\) particles (atoms, ions, etc.), which is known as Avogadro's number. The number of moles of a substance is determined by dividing the mass of the substance by its molar mass, which is the mass of one mole of the substance.
The balanced chemical equation is:
4Fe + 3O2 → 2Fe2O3
From the equation, we can see that 4 moles of Fe react with 3 moles of O2 to produce 2 moles of Fe2O3.
To find out how many grams of Fe and O2 reacted to form 65.6 grams of Fe2O3, we first need to calculate the number of moles of Fe2O3 produced:
molar mass of Fe2O3 = 2 x atomic mass of Fe + 3 x atomic mass of O = 2 x 55.845 + 3 x 15.999 = 159.685 g/mol
moles of Fe2O3 = mass of Fe2O3 / molar mass of Fe2O3
moles of Fe2O3 = 65.6 g / 159.685 g/mol
moles of Fe2O3 = 0.411 mol
From the balanced chemical equation, we know that 2 moles of Fe2O3 are produced from 4 moles of Fe and 3 moles of O2. Therefore, the number of moles of Fe and O2 that reacted can be calculated as follows:
moles of Fe = (4/2) x moles of Fe2O3
moles of Fe = 2 x 0.411 mol
moles of Fe = 0.822 mol
moles of O2 = (3/2) x moles of Fe2O3
moles of O2 = 1.5 x 0.411 mol
moles of O2 = 0.617 mol
Finally, we can calculate the mass of Fe and O2 that reacted:
mass of Fe = moles of Fe x atomic mass of Fe
mass of Fe = 0.822 mol x 55.845 g/mol
mass of Fe = 46.03 g
mass of O2 = moles of O2 x molar mass of O2
mass of O2 = 0.617 mol x 32.00 g/mol
mass of O2 = 19.75 g
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Look at these two molecular diagrams and think about the features of the compounds. (SEE PICTURE)
1. A chain of 5 C atoms is bonded to H above and below and to the left and the right, except that the 4th C is bonded to C H subscript 3 above instead of a plain H. 2. A chain of 4 C atoms is bonded to H above and below and to the left and the right, except the second C in the chain is bonded to C H subscript 3 above and below.
Which descriptions apply to these two compounds? Check all that apply.
are isomers of each other
have same molecular formula
have same structural formula
are both hydrocarbons
have same number of each kind of atom
have same geometric arrangement of atoms
Answer:
A, B, D, E
Explanation:
correct on Edge 2020
Answer:
1) are isomers of each other
2) are isomers of each other
4) are both hydrocarbons
5) have same number of each kind of atom
Explanation: edg 2020
HELP ASAP, HELP NEEDED QUICK, IT'S TIMED
If the concentration of reactants is higher, then the reaction rate is ______.
Select one:
a. generally lower
b. rate determining step is eliminated
c. not affected
d. generally higher
Answer:
option D generally higher
please answer Look at this image of a galaxy. Which type of galaxy is shown? A. elliptical B. irregular. C. normal spiral or D. barred spiral
Answer:
c .
Explanation:
Answer:
c
Explanation:
What is the composition of the nuclei modeled by these symbols? How many protons and neutrons?
There are six protons and eight neutrons present in the carbon atom as shown.
What is the nucleus?The nucleus of an atom consists of its protons and its neutrons. The protons are positively charged while the neutrons have no charge.
From the symbol of the element as shown in the question, we can see that there are six protons and eight neutrons present.
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What is the mass, in grams, of 289.1 mol of uranium?
The mass in grams of uranium is 820.255g
Mass is the any substances that would be calculated by using their moles
Here given data is
uranium in 1 mol = 289.1 mol
And the formula is
n = W/V
W = required mass = ?
M = molar mass of uranium = 238.05g/mol
n = moles of uranium = 289.1 mol
Then putting this value
W = 289.1 mol×238.05g/mol
W = 820.255g
The mass, in grams of 289.1 mol of uranium is 820.255g
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An ethylene glycol solution contains 30.8 g of ethylene glycol (C2H6O2) in 96.6 mL of water. (Assume a density of 1.00 g/mL for water.) Determine the freezing point of the solution. Determine the boiling point of the solution
The freezing point of the solution is -11.8 °C.
The boiling point of the solution is 103.31 °C.
To determine the freezing point of the solution, we can use the equation:
ΔTf = Kf * m
where:
ΔTf is the freezing point depression,
Kf is the cryoscopic constant (for water, Kf = 1.86 °C/m),
m is the molality of the solution (moles of solute per kilogram of solvent).
First, let's calculate the molality (m) of the solution:
Molar mass of ethylene glycol (C2H6O2):
C = 12.01 g/mol
H = 1.01 g/mol (x 6) = 6.06 g/mol
O = 16.00 g/mol (x 2) = 32.00 g/mol
Total molar mass = 12.01 g/mol + 6.06 g/mol + 32.00 g/mol = 50.07 g/mol
Number of moles of ethylene glycol (C2H6O2) = mass / molar mass
Number of moles = 30.8 g / 50.07 g/mol = 0.615 mol
Mass of water = volume x density = 96.6 mL x 1.00 g/mL = 96.6 g
Now, let's calculate the molality:
Molality (m) = moles of solute / mass of solvent (in kg)
Molality = 0.615 mol / 0.0966 kg = 6.36 mol/kg
Now we can calculate the freezing point depression (ΔTf):
ΔTf = Kf * m
ΔTf = 1.86 °C/m * 6.36 mol/kg = 11.8 °C
To find the freezing point of the solution, subtract the freezing point depression from the freezing point of pure water (0 °C):
Freezing point = 0 °C - 11.8 °C = -11.8 °C
To determine the boiling point of the solution, we can use the equation:
ΔTb = Kb * m
where:
ΔTb is the boiling point elevation,
Kb is the ebullioscopic constant (for water, Kb = 0.52 °C/m),
m is the molality of the solution (same value as calculated before: 6.36 mol/kg).
ΔTb = 0.52 °C/m * 6.36 mol/kg = 3.31 °C
To find the boiling point of the solution, add the boiling point elevation to the boiling point of pure water (100 °C):
Boiling point = 100 °C + 3.31 °C = 103.31 °C
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About 200 g of ice is taken from a freezer originally at −10C, put on a stove and gently heated. a) How much heat (J) is needed to raise the temperature of the ice from -10 C to 0 deg C (still ice) b) How much additional heat (J) is needed to fully melt the ice to liquid water (still at 0C )?
The total heat required to raise the temperature of ice from -10°C to 0°C is 418 J and the additional heat required to fully melt the ice to liquid water is 6680 J.
a) To calculate the heat required to raise the temperature of ice from -10°C to 0°C, we use the formula:
Q = mCΔT
where,
Q = heat required in J,
m = mass of the substance in kg,
C = specific heat capacity in J/kg°C, and
ΔT = change in temperature in °C
Given,m = 200
g = 0.2 kg
Cice = 2090 J/kg°C (specific heat capacity of ice)
ΔT = (0°C − (−10°C))
= 10°C.
Substituting all the values, we get,
Q = 0.2 kg × 2090 J/kg°C × 10°CQ
= 418 J
b) To calculate the additional heat required to melt the ice into liquid water, we use the formula:
Q = mL
where,Q = heat required in J,
m = mass of the substance in kg
L = latent heat of fusion in J/kg
Given,
m = 200 g
= 0.2 kg
Lfus = 3.34 × 105 J/kg (latent heat of fusion of ice)
Substituting all the values, we get,
Q = 0.2 kg × 3.34 × 105 J/kgQ
= 6680 J
Thus, the additional heat required to fully melt the ice to liquid water is 6680 J.
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I am researching something and I need your (Brainly's) opinion
Based on your opinion, Do you think social media is bad? you don't have to but tell me why
Answer:
I think it could be bad for some people because children could be exposed to toxic content. Without parent restrictions there could be some serious harm. Another reason, is that being on social media could distract kids from homework, chores, etc. (There is also scams and fake advertising)
I personally deleted a lot of my social media acc’s last year cause of me getting stressed and sad over it, but for now I’m pretty good I’m making friends off it having lots of fun
Which of the following is an amorphous solid?
O
A. Diamond
B. Graphite
O C. Glass
O D. Iron
Answer:
C. Glass
Explanation:
Amorphous solids have a non-crystalline structure and no order. In that case, Diamonds, Graphite, and Iron all have a crystalline structure and order. You are left with C as your answer.
Based on a comparative analysis of the charge and size of the ions that make up the ionic compounds in each of the following sets of substances, arrange then from higher (top) to lower (bottom) melting points: NaCl, NaF, NaBr
NaCl > NaBr > NaF The higher the charge and size of the ions that make up an ionic compound, the higher the melting point.
What is electrostatic forces ?Electrostatic forces are forces of attraction or repulsion that act between objects that have static electric charges. These forces are created when electrons are either transferred or shared between two objects. Electrostatic forces can be very strong, even though the charges involved are typically very small.
NaCl has the highest charge and size, so it will have the highest melting point. NaBr has a slightly lower charge and size than NaCl, so it will have a lower melting point. Finally, NaF has the lowest charge and size of the three, so it will have the lowest melting point.
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pls help
Beryllium has a specific heat of 1.825 J/(g . °C). How many joules of heat energy are required to raise the temperature of 2.300 grams of beryllium from 22.00 to 60.00°C?
Heat required to raise the temperature = 159.505 J
Further explanationGiven
c = specific heat of Beryllium = 1.825 J/g C
m = mass = 2.3 g
Δt = Temperature difference : 60 - 22 = 38 °C
Required
Heat required
Solution
Heat can be formulated
Q = m.c.Δt
Input the value :
Q = 2.3 x 1.825 x 38
Q = 159.505 J
At which temperature does water have particles with a greater average kinetic energy than water with a temperature of 30°C?
77°F
95°F
280K
300K
Answer:
95F
Explanation:
First we convert these temperatures into °C:
77°F = 25°C
95°F = 35°C
280K = 6.85°C
300K = 26.85°C
When temperature increases, water molecules have a greater average kinetic energy ans are more likely to collide with each other.
Out of the 4 temperatures, only 95°F (35°C) is of a higher temperature than 30°C. Hence 95°F is the answer.
Chemistry, biology and geography are the branch of natural science.
Select one:
True
False
Answer:
the answer is (a)true.
Answer (s) true.
Explanation: Natural science can be divided into two main branches: life science and physical science. Life science is alternatively known as biology, and physical science is subdivided into branches: physics, chemistry, astronomy and Earth science.
Describe your observations of how the waves are behaving in the photograph.
Answer:
The waves are behaving this way due to the simultaneous water drops landing in the water.
Explanation:
because ima smart baddie (≧▽≦)
How many atoms of iron (Fe) are in a sample of 7. 38 mol Fe?.
Answer:
3.77
moles of Fe contain
2.27
×
10
24
atoms Fe
.
Explanation:
Explanation:
One mole of anything is
6.022
×
10
23
everythings, including atoms.
Multiply the moles Fe by
6.022
×
10
23
atoms/mol.
3.77
mol Fe
×
6.022
×
10
23
atoms Fe
1
mol Fe
=
2.27
×
10
24
atoms Fe
rounded to three
Which cell is an animal cell
Answer: the eukaryotic cell
Explanation: Animal cells are typical of the eukaryotic cell, enclosed by a plasma membrane and containing a membrane-bound nucleus and organelles. Unlike the eukaryotic cells of plants and fungi, animal cells do not have a cell wall.