Answer:
8.1g
0.1g
Explanation:
The reaction expression is given as:
Fe + 2HBr → FeBr₂ + H₂
Mass of pure iron given = 2.8g
A. Mass of HBr needed to dissolve a padlock of the mass;
To solve this problem, we need to use the mole concept.
Convert mass of the known iron to the number of moles.
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass = 56g/mol
Number of moles of iron = [tex]\frac{2.8}{56}[/tex] = 0.05mole
1 mole of Fe will react with 2 mole of HBr
0.05mole of Fe will react with 0.05 x 2 = 0.1mole of HBr
Mass of HBr = number of moles x molar mass
Molar mass of HBr = 1 + 80 = 81g/mol
Mass of HBr = 0.1 x 81 = 8.1g
B. What mass of H2 would be produced by the complete reaction of the iron bar
Since:
1 mole of Fe will produce 2 mole of hydrogen gas
0.05mole of Fe will produce 2 x 0.05mole = 0.1mole of hydrogen gas
Mass of hydrogen gas = number of moles x molar mass
= 0.1 x 1
= 0.1g
How much work is done when Bob uses 75 newtons of force to move a block 8 meters?
Answer:
600 JExplanation:
The work done by an object can be found by using the formula
workdone = force × distance
From the question we have
workdone = 75 × 8
We have the final answer as
600 JHope this helps you
Which statement describes a similarity between conductors and insulators?
They both allow for the free flow of electrons between atoms.
They can both be made without matter.
They both involve high resistance to electrical charge.
They can both be used in an electric circuit.
Answer:
They can both be used in an electric circuit.
Explanation:
Though conductors and insulators are very different from each other but still they have a similarity that "they can both be used in an electric circuit".
Conductors are the material that allows electricity to flow and insulators have high resistance and do not allow electricity to flow.
Both conductors and insulators are used in an electric circuit as conductor is used in wires, batteries and bulb to flow current while insulators are used in insulation of wire, switches, plugs and etc. Combination of them makes the circuit shock free.
Hence, the correct answer is "They can both be used in an electric circuit."
Answer:
They can both be used in an electric circuit.
Explanation:
The rate of decomposition of radioactive radium is proportional to the amount present at any time. The half-life of radioactive radium is 1599 years. What percent of a present amount will remain after 635 years
Answer:
[tex]\% \frac{A}{A_0}=75.9\%[/tex]
Explanation:
Hello!
In this case, since the kinetics of the radioactive decay is assumed to be first-order, it is possible to use the following equation to quantify that change:
[tex]\frac{A}{A_0} =2^{-\frac{t}{t_{1/2}}[/tex]
Thus, given the elapsed time, 635 years, and the half-life, 1599 years, we can compute the fraction of the present amount:
[tex]\frac{A}{A_0} =2^{-\frac{365years}{1599years}\\\\\frac{A}{A_0} =0.759[/tex]
Thus, the percent is:
[tex]\% \frac{A}{A_0}=0.759*100\%\\\\ \% \frac{A}{A_0}=75.9\%[/tex]
Best regards!
Which scenario best describes a relationship of parasitsm
10. All atoms of the same element have the same______
O number of neutrons
O mass numbers
O number of protons
O mass
a helium balloon at 28 C has a volume of 1.8 L and a pressure of 102 kPa. what is the volume of the balloon when is rises into the atmosphere where the pressure is 85 kPa and the temperature is 4 C?
Answer:
V₂ =1.99 L
Explanation:
Given data:
Initial volume = 1.8 L
Initial temperature = 28°C (28+273.15 K= 301.15 k)
Initial pressure = 102 KPa
Final volume = ?
Final pressure = 85 KPa
Final temperature = 4°C (4+ 273.15 K = 277.15 K)
Solution:
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
V₂ = 102 KPa × 1.8 L × 277.15 K / 301.15 K × 85 KPa
V₂ = 50884.74 KPa .L. K / 25597.75 K.KPa
V₂ =1.99 L
What are some ways to prevent heat energy loss in matter?
Answer:
Use less heat in your house.
Explanation:
You have blankets in your house, huddle up for a good movie together.
Answer:
Simple ways to reduce heat loss include
Heat loss through windows can be reduced by using double glazing
Heat loss through walls can be reduced using cavity wall insulation
Heat loss through the roof can be reduced by laying loft insulation
Explanation:
Under certain conditions, the substance calcium carbonate can be broken down to form calcium oxide and carbon dioxide. If 31.7 grams of calcium carbonate react to form 17.8 grams of calcium oxide, how many grams of carbon dioxide must simultaneously be formed
Answer:
[tex]13.93\ \text{g}[/tex]
Explanation:
Molecular weight of [tex]CaCO_3[/tex] = 100.0869 g/mol
Mass of [tex]CaCO_3[/tex] = 31.7 g
Moles of [tex]CaCO_3[/tex] = [tex]\dfrac{31.7}{100.0869}=0.3167\ \text{mol}[/tex]
Moles of both [tex]CaO[/tex] and [tex]CO_2[/tex] is [tex]0.3167\ \text{mol}[/tex]
Molecular weight of [tex]CO_2[/tex] = 44 g/mol
Mass of [tex]CO_2[/tex] = [tex]44\times 0.3167=13.93\ \text{g}[/tex]
The mass of carbon dioxide formed simultaneously is [tex]13.93\ \text{g}[/tex].
can u pls help me with this question
Answer:
B
Explanation:
Please help me thanks so much?!?.:;)...I’ll mark you.:;)))
Answer:
physical
Explanation:
A student is trying to determine the rate law of a chemical reaction. When the initial concentration is varied, the initial reaction rate is always the same. The student concludes that something must be wrong with the chemicals or reaction and decides to increase the temperature. What can you say about this conclusion
Answer:
His conclusion is wrong
Explanation:
Now we must know that there are various rate laws.
In a zero order rate law, the rate of reaction is independent of the initial concentration of reactants. Hence varying the initial concentration of the reactants results in no change of the rate of reaction.
In first and second order rate laws, the rate of reaction varies with the concentration of one or two reactants in either case respectively.
Having said these, the student does not need to change the temperature but rather designate the reaction as zero order. The rate of reaction is independent of the initial concentration of reactants.
Which example is an endothermic process
Answer:
Endothermic reactions is the result of heat being absorbed.
Explanation:
Melting ice cubes. Melting solid salts. Evaporating liquid water. Converting frost to water vapor (melting, boiling, and evaporation, in general, are endothermic processes.
(These are all examples of endothermic reactions.)
Create brown bunnies and white bunnies together
with a brown background.
After 2 generations add wolves.
What happens to the bunnies?
PLS ANSWER
Answer:
I don't know exactly how you want me to answer but I feel like the white bunnies population decrease because the brown bunnies have an advantage with the brown background so the wolves will hunt and kill all the white ones because they are more standing out.
Answer:
If you are thinking all the white bunnies would be gone that would not happen
Explanation:
If you put white bunnies with the withe the brown bunnies they would breed so then there would be more bunnies then there would be more bunnies and wolves.
Question 3 of 10
Often, personal data are transmitted using digital signals. What might go
wrong with these transmissions?
A. The signal might become too weak to detect because it slows
down
B. The data might be altered, or changed, during the transmission
C. The data might be misinterpreted because of noise,
D. The data might be stolen or accessed by hackers.
Answer: D
Explanation:
The personal data are transmitted using digital signals. The data might be stolen or accessed by hackers to go wrong with these transmissions. Therefore, option D is correct.
What is digital signal ?A digital signal is one that can only ever take on one of a few discrete values at any given time. It represents data as a sequence of discrete values.
A continuous signal that represents physical measurements is an analog signal. Digital modulation is used to create time-separated signals known as digital signals. Sine waves serve as its signal. The square waves serve as a marker.
It makes use of a continuous range of values to aid in the representation of data. Digital technologies are any techniques, systems, equipment, or resources that produce, store, or process data electronically.
Thus, option D is correct.
To learn more about digital signal, follow the link;
https://brainly.com/question/22717116
#SPJ5
Which of the following can be used to indicate which direction heat transfer will flow between two
objects?
A. Cold
B. Heat
C. Temperature
D. Potential energy
Answer:
the answer is potential energy
Explanation:
Answer: potential energy
Explanation:
Please help me thanks so much??!!.:;))..I will mark you:))
Answer:
I did
Explanation:
KCI is a molecule. True or False
Answer: duh
Explanation:
How many moles of CO are present in 35.88 L of the gas?
Answer:
1.602 moles CO
Explanation:
To convert from liters to moles, divide by 22.4:
35.88 L / 22.4 = 1.602 moles CO
Question 6 (1 point)
Hydrogen gas and nitrogen gas can react to form ammonia according to this equation: N2 (g) + m 3H2 (g) --> 2NH3(g) How many liters of nitrogen gas are required to produce 4 moles of NH3 (g)? Assume conditions of standard temperature and pressure (STP). Hint: One mole of gas occupies 22.4 liters under standard conditions of temperature and pressure (STP).
Answer:
44.8 L of N₂.
Explanation:
We'll begin by writing the balanced equation for the. This is illustrated below:
N₂ + 3H₂ —> 2NH₃
From the balanced equation above,
1 mole of N₂ reacted to produce 2 moles of NH₃.
Therefore, Xmol of N₂ will react to produce 4 moles of NH₃ i.e
Xmol of N₂ = (1 × 4)/2
Xmol of N₂ = 2 moles
Thus, 2 moles of N₂ reacted to produce 4 moles of NH₃.
Finally, we shall determine the volume of N₂ required for the reaction. This can be obtained as follow:
1 mole of N₂ occupies 22.4 L at STP.
Therefore, 2 moles of N₂ will occupy = (2 × 22.4) = 44.8 L
Thus, 44.8 L of N₂ is needed to produce 4 moles of NH₃.
Two Balloons one filled with hydrogen gas and second filled with neon gas. what gas should be used in an experiement to identify the element in each balloon?
Answer:
Oxygen
Explanation:
If two balloons are filled with hydrogen gas and helium gas respectively, then we want to identify what gas is in each balloon, we have to do so by exposing the both balloons to flame in an oxygen atmosphere.
Hydrogen combines with oxygen in the presence of a flame with quite a loud sound and the flame is sustained but when a flame is brought near helium gas in a balloon, the gas will only make a little sound when exposed to the flame and extinguish the flame.
The reason for the explosion of the gas in the hydrogen balloon is that combustion of hydrogen gas is exothermic. The heating up of surrounding air molecules leads to a sudden explosion.
However, the helium balloon makes a little sound when the balloon is ruptured releasing helium gas which extinguishes the flame.
F O R 50 P O I N T S !!!
Give the exact quantum numbers of:
1. 11th electron in 5f14
2. 8th electron in 4d10
3. 5th electron in 4p6
4. 15th electron of phosphorus
5. Last electron of Neptunium
Answer:
You would put the 4 quantum numbers corresponding to the electrons being described above
Explanation:
Quantum numbers refer to electrons, so I'll assume you mean the electron number that would correspond with the atomic number of the element. Quantum numbers are basically like an address for electrons, giving us information about the location of an electron from most general to most specific.
The quantum selection rules allow finding the results for the quantum numbers for each electrons are:
1. n = 5, f l = 3 el m = 1
The quantum number of spin. Opposite the first electrons.
2. n = 4, l = 2, m = 0
Spin opposite the first electrons.
3. n = 4, l = 1, m = 0
Spin number opposite the first electrons.
4. n = 3, l = 1, m = 1
Spin all electrons have the same spin.
5. n = 7, l = 2, m = 0
Spin quantum number two electrons with opposite spin.
The solution of the Scrodinger's equation in three dimensions results have three constants related, these constants are called quantum numbers.
Principal (n). Determines the energy of the electron and has values from zero to infinity. Secondary or orbital (l). Determines the shape of the orbitals and has values from zero to (n-1), in general letters are used for their representation for the values 0,1, 2, 3 the symbols are used: s, p, d, f. Magnetic (m). It corresponds to the magnetic moment due to the movement of the electron around the nucleus. It can have values from -l to l.
In independent experiments, a fourth quantum number called the spin magnetic moment was found, it can have two values + ½ and - ½
The rules for valid combinations of these quantum numbers are called selection rules, the spectroscope notation for each electron is.
[tex]n l ^m[/tex]
Where n is the principal number, l the orbital and m the magnetic.
To determine the value of the spin quantum number, the Pauli exclusion principle is used, which establishes that you cannot have two fermions (electrons) in the same quantum state, this deteriorates that in a state there can only be two electrons, one with upward spin and the other spin down.
Let's find the combination of these constants for each case.
1. The 11th electron of level 5f¹⁴.
The principal quantum number n = 5
Orbital quantum number f, l = 3
In the f orbital, a maximum of 14 electrons can be placed, since it has 7 sub-levels and according to the Pauli Exclusion principle, each one can have two electrons.
We place 1 electron in each sub-level and then we place a second electron with the opposite spin, therefore when we get to electron number 11 it has a spin opposite to that of the first 7 electrons, but there is no way to previously know its value.
we construct a table with the distribution of electrons.
Quantum number Electrons
n = 5
l = 0
l = 1
l = 2
l = 3
m = -3 ½ - ½
m = -2 ½ - ½
m = -1 ½ - ½
m = 0 ½ - ½
m = 1 ½
m = 2 ½
m = 3 ½
With the help of this table the other numbers are:
Tthe magnetic quantum number is m = 1
The quantum number of spin. opposite the spin of the first electrons.
2. The eighth electron of the 4d¹⁰ state
Pricipal number n = 4
Orbital number l = 2
We construct a table with the distribution of electrons.
Quantum number Electrons
n = 4
l = 0
l = 1
l = 2
m = -2 ½ - ½
m = -1 ½ - ½
m = 0 ½ - ½
m = 1 ½
m = 2 ½
With this table the other quantum numbers are;
Magnetic m = 0
Spin opposite the first electron
3. 5th electron of 4p⁶
Principal number n = 4
Orbital number p l = 1
We construct a table with the distribution of electrons.
Quantum number Electrons
n = 4
l = 0
l = 1
m = -1 ½ - ½
m = 0 ½ - ½
m = 1 ½
Magnetic number m = 0
Spin number opposite the first electrons.
4. 15th electron of phosphorus
The electron configuration of phosphor is
1s² 2s²2p⁶ 3s²3p³
Principal quantum number n = 3
Orbital quantum number p, l = 1
We construct the electron distribution table.
Quantum number electrons
n = 3
l = 0
l = 1
m = -1 ½
m = 0 ½
m = 1 ½
The other quantified numbers are:
Magnetic m = 1
Spin all electrons have the same spin.
5. The last electron of neptunium.
Electronic configuration.
Radon Gas Configuration + 5f⁴6d¹ 7s²
Principal quantum number n = 7
Orbital quantum number l = 2
Magnetic quantum number m = 0
Spin quantum number two electrons with opposite spin.
In conclusion using the quantum selection rules can determine the quantum numbers for each given electron are:
1. n = 5, f l = 3 el m = 1
The quantum number of spin. Opposite the first electrons.
2. n = 4, l = 2, m = 0
Spin opposite the first electrons
3. n = 4, l = 1, m = 0
Spin number opposite the first electrons.
4. n = 3, l = 1, m = 1
Spin all electrons have the same spin
5. n = 7, l = 2, m = 0
Spin quantum number two electrons with opposite spin.
Learn more about the quantum selection rules here: brainly.com/question/14288557
A solution containing 4.15 g of magnesium chloride is added to a second solution containing excess
sodium sulfate. Magnesium sulfate precipitates.
•Calculate the ideal yield of magnesium sulfate
. If actual yield is 3.95 g, calculate percentage yield
1. Eq.:
2. Given:
3. Wanted:
4. Answer:
Answer:
1. 5.24 g
2. 75.4%
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
MgCl₂ + Na₂SO₄ —> MgSO₄ + 2NaCl
Next, we shall determine the mass of MgCl₂ that reacted and the mass of MgSO₄ produced from the balanced equation. This can be obtained as follow:
Molar mass of MgCl₂ = 24 + (35.5×2)
= 24 + 71
= 95 g/mol
Mass of MgCl₂ from the balanced equation = 1 × 95 = 95 g
Molar mass of MgSO₄ = 24 + 32 + (16×4)
= 24 +32 + 64
= 120 g/mol
Mass of MgSO₄ from the balanced equation = 1 × 120 = 120 g
SUMMARY:
From the balanced equation above,
95 g of MgCl₂ reacted to produce 120 g of MgSO₄.
1. Determination of the ideal yield of magnesium sulfate, MgSO₄.
From the balanced equation above,
95 g of MgCl₂ reacted to produce 120 g of MgSO₄.
Therefore, 4.15 g of MgCl₂ will react to produce = (415 × 120)/95 = 5.24 g of MgSO₄.
Thus, the ideal yield of magnesium sulfate, MgSO₄ is 5.24 g
2. Determination of the percentage yield.
Actual yield of MgSO₄ = 3.95 g
Ideal yield of MgSO₄ = 5.24 g
Percentage yield =?
Percentage yield = Actual yield / Ideal yield × 100
Percentage yield = 3.95 / 5.24 × 100
Percentage yield = 395 / 5.24
Percentage yield of MgSO₄ = 75.4%
What is the degree of sugar dissociation?
Answer: Na+ (8%)
Explanation:
Calculate the number of moles of aluminum, sulfur, and oxygen atoms in 3.00 molesmoles of aluminum sulfate, Al2(SO4)3Al2(SO4)3. Express the number of moles of AlAl, SS, and OO atoms numerically, separated by commas.
Answer:
[tex]n_{Al}=6.00molAl\\\\n_{S}=9.00molS\\\\n_{O}=36.0molO[/tex]
Explanation:
Hello!
In this case, when analyzing the moles of an element inside a compound, we need to keep in mind that a mole ratio should be set up; thus, for aluminum sulfate, we have the following ones:
[tex]\frac{2molAl}{1molAl_2(SO_4)_3} \\\\\frac{3molS}{1molAl_2(SO_4)_3} \\\\\frac{12molO}{1mol1molAl_2(SO_4)_3}[/tex]
Thus, starting by 3.00 moles of aluminum sulfate, the moles of each element turn out:
[tex]n_{Al}=3.00molAl_2(SO_4)_3*\frac{2molAl}{1molAl_2(SO_4)_3} =6.00molAl\\\\n_{S}=3.00molAl_2(SO_4)_3*\frac{3molS}{1molAl_2(SO_4)_3} =9.00molS\\\\n_{O}=3.00molAl_2(SO_4)_3*\frac{12molO}{1molAl_2(SO_4)_3}=36.0molO[/tex]
Best regards!
What are advantages of specialization
Answer:
ACE
Explanation:
Defined skill set: When we say advantages it is seen that it can be visualized during the early stages of one’s career.
Upward growth: Having a specific skill or being specialized in that work would also bring growth in that division. ...
Good package: A job specialization means a person is knowing how to do that work and complete it.
I think that rock from the mantle is added to the edges of both plates at
convergent plate boundaries.
divergent plate boundaries.
Answer:
The Earth’s lithosphere, which includes the crust and upper mantle, is made up of a series of pieces, or tectonic plates, that move slowly over time.
A divergent boundary occurs when two tectonic plates move away from each other. Along these boundaries, earthquakes are common and magma (molten rock) rises from the Earth’s mantle to the surface, solidifying to create new oceanic crust. The Mid-Atlantic Ridge and Pacific Ring of Fire are two examples of divergent plate boundaries.
Answer: Divergent
Explanation: im pretty sure its a multiple choice question
Can someone plz help me it’s due tomorrow!!!!!!!
Answer:
1.A lantern has a candle or fuel cell which heats the air and this hot air fills the sky lantern. The consequence of this is that the lantern rises in the air. This happens because the hot air inside the lantern is lighter than the cool air surrounding it. ... This fuel cell is lit before the lantern is launche
2.Whenever something becomes warmer, the kinetic energy of its atoms or molecules has increased. When matter gets warmer, the atoms or molecules in the matter move faster. It's easy to increase the kinetic energy in matter.
PLEASE ANSWER: The density of a gas at STP is 0.75 g/L. What is the mass of this gas?
Answer:
the mass of the glass is 2
Liquid gasoline is heated and becomes gasoline vapor. The gasoline vapor is then ignited by a spark, causing a fire. The entire process is: Group of answer choices
Answer: First an endothermic and then followed by the exothermic process
Explanation:
Based on the information given in the question, we should note that the entire process is an endothermic process at first and then an exothermic process.
We should note that heat is absorbed during an endothermic process and the environment is cooled but for an exothermic process, heat is being released which leads to the increase in the temperature of the surroundings.
I need help asap please help me
Answer:
it says the answer is variation
