Answer:
Explanation:
The first thing that you need to do here is to calculate the theoretical yield of the reaction, i.e. what you get if the reaction has a
100
%
yield.
The balanced chemical equation
N
2
(
g
)
+
3
H
2
(
g
)
→
2
NH
3
(
g
)
tells you that every
1
mole of nitrogen gas that takes part in the reaction will consume
3
moles of hydrogen gas and produce
1
mole of ammonia.
In your case, you know that
1
mole of nitrogen gas reacts with
1
mole of hydrogen gas. Since you don't have enough hydrogen gas to ensure that all the moles of nitrogen gas can react
what you need
3 moles H (sub 2)
>
what you have
1 mole H (sub2)
you can say that hydrogen gas will act as a limiting reagent, i.e. it will be completely consumed before all the moles of nitrogen gas will get the chance to take part in the reaction.
So, the reaction will consume
1
mole of hydrogen gas and produce
1
mole H
2
⋅
2 moles NH
3
3
moles H
2
=
0.667 moles NH
3
at
100
%
yield. This represents the reaction's theoretical yield.
Now, you know that the reaction produced
0.50
moles of ammonia. This represents the reaction's actual yield.
In order to find the percent yield, you need to figure out how many moles of ammonia are actually produced for every
100
moles of ammonia that could theoretically be produced.
You know that
0.667
moles will produce
0.50
moles, so you can say that
100
moles NH
3
.
in theory
⋅
0.50 moles NH
3
.
actual
0.667
moles NH
3
.
in theory
=
75 moles NH
3
.
actual
Therefore, you can say that the reaction has a percent yield equal to
% yield = 75%
−−−−−−−−−−−−−
or 75 moles NH sub3
I'll leave the answer rounded to two sig figs.
Heeelllpp !!
What system is sealed and will not release any gases from a chemical reaction?
Answer: closed system
Explanation:
Caffeine (C8H10N4O2) is a weak base with a pKb of 10.4. Calculate the pH of a solution containing a caffeine concentration of 415 mg/L .
Answer:
pH → 7.47
Explanation:
Caffeine is a sort of amine, which is a weak base. Then, this pH should be higher than 7.
Caffeine + H₂O ⇄ Caffeine⁺ + OH⁻ Kb
1 mol of caffeine in water can give hydroxides and protonated caffeine.
We convert the concentration from mg/L to M
415 mg = 0.415 g
0.415 g / 194.19 g/mol = 2.14×10⁻³ mol
[Caffeine] = 2.14×10⁻³ M
Let's calculate pH. As we don't have Kb, we can obtain it from pKb.
- log Kb = pKb → 10^-pKb = Kb
10⁻¹⁰'⁴ = 3.98×10⁻¹¹
We go to equilibrium:
Caffeine + H₂O ⇄ Caffeine⁺ + OH⁻ Kb
Initially we have 2.14×10⁻³ moles of caffeine, so, after the equilibrium we may have (2.14×10⁻³ - x)
X will be the amount of protonated caffeine and OH⁻
Caffeine + H₂O ⇄ Caffeine⁺ + OH⁻ Kb
(2.14×10⁻³ - x) x x
We make the expression for Kb:
3.98×10⁻¹¹ = x² / (2.14×10⁻³ - x)
We can missed the -x in denominator, because Kb it's a very small value.
So: 3.98×10⁻¹¹ = x² / 2.14×10⁻³
√(3.98×10⁻¹¹ . 2.14×10⁻³) = x → 2.92×10⁻⁷
That's the [OH⁻]. - log [OH⁻] = pOH
- log 2.92×10⁻⁷ = 6.53 → pOH
14 - pOH = pH → 14 - 6.53 = 7.47
When is the mole ratio from a balanced chemical reaction not needed in a calculation
Answer:16
Explanation:
Write a balanced equation for each reaction. KOH(aq) + H3PO4,(aq)
Answer:
3 KOH(aq) + H3PO4(aq) = K3PO4(aq) + 3 H2O
Explanation:
What are these means in Periodic Table;
Group
Period
Block
Type the correct answer in each box.
Balance the equation.
_____SiO2 + ______CaC2 → _____Si + _______CaO + _____CO2
The balanced equation of the given reaction is as follows: 5SiO2 + 2CaC2 → 5Si + 2CaO + 4CO2.
How is an equation balanced?A chemical equation is said to be balanced when the number of atoms of each element on both sides of the equation is the same.
According to this question, a chemical reaction between quartz and calcium chloride is given to produce silicon, calcium oxide and carbon dioxide.
The balanced equation that represents an equal number of atoms on both sides is as follows:
5SiO2 + 2CaC2 → 5Si + 2CaO + 4CO2
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BRAINLIEST WILL BE GIVEN, PLZ HELP + 15 PTS
Which properties are characteristic of true solutions? (Select all that apply.)
The light beam is unaffected.
The particles are larger than 10 -8 cm.
The particles are dissolved.
The particles are suspended indefinitely.
Answer:
The correct answer is the last option
Explanation:
2
In the movie, Tim says that Saturn's rings refract light to
produce colors. What does this mean?
A They emit light
B They bend and reflect light
CThey absorb all light
D They block light
Answer:
It would be B they bend to reflect light
pls help will give brainless
PLEASE HELP I SCORED A 20%
What is the function of the outer covering of a plant?
A plant's outer covering is involved in reproduction.
A plant's outer covering helps reduce water loss.
A plant's outer covering is for preying on other plants.
A plant does not have an outer covering.
Answer:b
Explanation:
The function of the outer covering of a plant is to help reduce water loss, option B. The outer covering of a plant is known as the epidermis, and it serves as a protective layer that helps to prevent excessive water loss through transpiration.
What is plant's epidermis ?The epidermis may contain specialized structures such as stomata and trichomes, which further regulate water loss and protect the plant from environmental stresses such as insect predation and UV radiation.
Option A, "A plant's outer covering is involved in reproduction," is incorrect because the reproductive structures of plants are typically located within the plant's interior, not on the outer surface.
Option C, "A plant's outer covering is for preying on other plants," is incorrect because plants are not capable of actively preying on other plants.
Option D, "A plant does not have an outer covering," is incorrect because all plants have an outer covering in the form of the epidermis or a similar structure.
Hence, option B is correct.
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Which is an example of kinetic energy?
A. A stretched rubber band
B. Wind
C. Water in a reservoir
D. Natural gas
E. An object suspended above the ground
Answer:
B. Wind
Explanation:
Kinetic energy is moving
No links.
Calculate the pH and pOH of each solution.
a) [H + ] = 1.7 x 10 -8M
b) [H + ] = 1.0 x 10 -7M
Explanation:
first find the value of Ph
from Ph= -log[H+]
ph=-log[1.7x10^-8]=7.769
find Poh from 14=ph+poh
14=7.769+poh
Poh=6.231 part a
for part b the same as part a from the above procedure
HELP A #QUEEN OUT !!!!!!
Select the correct answer.
Which reaction is a decomposition reaction?
A.
2KClO3 → 2KCl + 3O2
B.
4Na + O2 → 2Na2O
C.
ZnS + 3O2 → 2ZnO + 2SO2
D.
2NaBr + CaF2 → 2NaF + CaBr2
Answer: 2KClO3 → 2KCl + 3O2
Explanation: it's the only one that was broken down into more parts than the start, the rest were simply reseperated
this one : 1 → 2
b : 1 + 1 = 2
c : xy+ wz → wy + xz
d : qwer +tyuio → qwui + tyero
ALSO I got it right
Stem cells can differentiate into how many types of body cells?
How many grams of magnesium
sulfate (MgSO4) are dissolved in
0.965 L of a 0.0575 M solution?
Molar Mass Mg: 24.30 g/mol
Molar Mass S: 32.06 g/mol
Molar Mass O: 16.00 g/mol
Explanation:
Concentration question....
0.965L x (0.0575 mol MgSO4 / 1L) x (120.4g MgSO4 / 1 mol MgSO4) = 6.68g MgSO4
The concept molarity is used here to determine the grams of magnesium sulfate dissolved in 0.965 L of a 0.0575 M solution. The mass of magnesium sulfate in grams is 6.68 g.
What is molarity?The molarity of a solution is defined as the number of moles of the solute present per litre of the solution. It is generally represented by the unit mol/L. The equation used to calculate the molarity is:
Molarity = Number of moles of the solute / Volume of the solution in litres
The molar mass of MgSO₄ = 120.36 g/mol
We have 0.0575 M solution.
That is 0.0575 mol/L × 120.36 g/mol = 6.9207 g/L
Here we want mass in 0.965 L. So the mass is:
Mass = 0.965 L × 6.9207 g/L = 6.68 g
Thus the mass in grams of magnesium sulfate is 6.68 g.
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If the prescribed dosage of milk of magnesia Mg(OH)2 is 3.5 moles, how many grams
would you need to take? Round to the nearest tenth (one digit after the decimal).
A. 92.1 g
B. 204.2g
C. 157.2 g
D. None of the above
Answer:
B
Explanation:
1 mole is equal to 58.31968 grams.
so 3.5 moles equal to answer choice B
In the image of the billiard table below, a cue ball is about to be struck and pushed toward the other balls
When the cue ball collides with the other balls, it will slow down and the other balls will be set in motion. Which statements best
describes why?
OA. The cue ball loses all of its kinetic energy, and the other balls gain some kinetic energy
OB. The cue ball loses all of its kinetic energy, and the other balls gain some potential energy
OC. The cue ball loses some of its potential energy, and the other balls gain some kinetic energy
OD. The cue ball loses some kinetic energy, and the other balls gain some kinetic energy
Answer:
c
Explanation:
A student makes several observations about a plece of iron. Which observation describes a chemical property of the Iron?
Answer:rust
Explanation:
The hammerhead shark can reproduce both sexually and asexually. What characteristic of the offspring would suggest that they were produced
through sexual reproduction? Offspring are-
all the same gender.
genetically diverse.
produced in small number.
produced very slowly.
Answer: I think it is ‘Genetically diverse’
Explanation:
At STP (101.3 kPa, 0 °C), what volume would 2.00 moles of oxygen gas occupy? The gas constant is 8.31
Answer:
44.8 L
Explanation:
Ideal Gas Equation -
i.e.,
PV = nRT
where,
P = pressure
V = volume
n = moles
R = universal gas constant
T = temperature
Using the information given in the question, Volume of the gas can be calculated -
P = 101.3 kPa
V = ?
n = 2.00 moles
R = 8.31
T = 0 degree C = 273.15 K
Using the above data, and putting the data in the respective formula -
PV = nRT
101.3 kPa * V = 2.00 moles * 8.31 * 273.15 K
V = 44.8 L
Hence, the volume of the given gas = 44.8 L
Explain what happens when salt used for snow causes metallic parts of a car to corrode. What is the process called?
Answer:
Why does a car rust from road salt? Metal parts of a car come in contact with precipitation water containing carbon dioxide and oxygen. Road salt contains free-radical ions and they come into contact with the precipitation water. After extended exposure to oxygen, iron oxide forms, which speeds up the rusting process.
Explanation:
What is the difference between an exoplanet and a pulsar
Answer:
exoplanet: a planet that orbits a star outside the solar system.
pulsar: a celestial source of pulsating electromagnetic radiation (such as radio waves)
Explanation:
exoplanet: a planet that orbits a star outside the solar system.
pulsar: a celestial source of pulsating electromagnetic radiation (such as radio waves)
PLEASE HELP!! 15 POINTS!
What could the fourth quantum number of a 2s^2 electron be?
Answer:
option D
Explanation:
first quantum number of a 2s2
n = 2
second quantum number of a 2s2
l = 0 to n-1
l = 0, 1
For s orbital
l = 0
third quantum number of a 2s2
ml = - l to +l
ml = 0
fourth quantum number of a 2s2 electron be
?½ = spin down
½ = spin up
2s2 has 2 electrons 1 spin down and 1 spin up (starts with spin down)
ms = +1/2
Answer:
+1/2
Explanation:
The specific heat of nickel is 0.445 J/g degree Celsius. How much heat is required to heat a 168 gram piece of nickel from 15.2 degrees Celsius to 43.6 degrees Celsius?
A hot air balloon rises because the fire warms up the air and the air circulates to fill the balloon and lift it at the same time. What type of heat transfer is this?
Answer:
convection
Explanation:
Convection is a mode of heat transfer in which the particles of a substance actually move from place to place.
During convection, warmer and less dense air rises while colder and denser air sinks downwards under gravity.
Hence; when hot air balloon rises because the fire warms up the air and the air circulates to fill the balloon and lift it at the same time, convection has taken place.
Can someone please help me with my chemistry hw
Answer:
a) 18
b)288g
Explanation:
a) 1:4
4.5mol TiCl4 so HCl is 4(4.5mol)
b) mm of HCl is 36
because 1:4 we multiply 2.0 mol by 4
8mol of HCl
we multiply 8mol by 36 (molar mass of HCl) and we get 288g because mol×molar mass= grams
Convert 0.64 moles of table salt (NaCl) to grams
Answer:
0.64 moles of table salt = 37.44 grams of table salt
Explanation:
mNaCl = 0.64 x (23 + 35.5) = 37.44 grams
Define stoichiometry
Stoichiometry is the field of chemistry that is concerned with the relative quantities of reactants and products in chemical reactions. For example, when oxygen and hydrogen react to produce water, one mole of oxygen reacts with two moles of hydrogen to produce two moles of water
Answer:
the relationship between the relative quantities of substances taking part in a reaction or forming a compound, typically a ratio of whole integers.
Explanation:
Dont put so much points pal,
which one is more soluble C12H22O11 or MgCl2 and why?
Answer:
MgCl2
Explanation:
because of the salt containing Cl
please help me this is due very soon
Answer:
the answer is a because thermal energy is heat and the question said that is not a factor of thermal energy so A does not refer to heat