What is the empirical formula of a compound that is 79.8% carbon and 20.2% hydrogen?
Answers
The empirical formula of the compound containing 79.8% carbon and 20.2% hydrogen is CH₃
Data obtained from the question
- Carbon = 79.8%
- Hydrogen= 20.2%
- Empirical formula =?
How to determine the empirical formula
Divide by their molar mass
C = 79.8 / 12 = 6.65
H = 20.2 / 1 = 20.2
Divide by the smallest
C = 6.65 / 6.65 = 1
H = 20.2 / 6.65 = 3
Thus, the empirical formula of the compound is CH₃
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Related Questions
Rita divides Avogadro’s number (approximately 6.022 mc002-1.jpg 1023) by 2.0550 to calculate the number of atoms in a sample. Which expression gives her result to the correct number of significant figures?
A.) Thermal Decomposition of 2.765 g NaHCO3 yields 1.234g of a solid Na2CO3 . Calculate the theoreticial yield and percent yield of Na2CO3.B) Thermal decomposition of 2.968 g of a mixture containing NaHCO3 lost 0.453 g . Calculate the percentage of NaHCO3 in this unknown mixture
during a canoe race, a camper paddles a distance of 406 meters in 70 seconds. what's the average speed of the race?
How many milliters of a 0.171 solution contains 1.00 g of NaCl
Answers
is the energy needed to raise an electron in the hydrogen atom from the second energy level to the third energy level.
What are Energy Levels?
The electrons that surround an atom around the nucleus are located in regions called "energy levels". It represents the 3-D space that surrounds the nucleus where the electrons are present. It is divided into several energy levels such as first energy level, second energy level and so on.
The level that is closest to the nucleus is the first energy level, then the second one is further away from it, then the third one is a little further away and so on. Each energy level has different number of electrons like first has 2 electrons, second has 8, third has 8 and so on. The electrons which are further away from the nucleus are called valence electrons.
For given above information,
E = - /
where,
= 13.6 eV (1 eV = 1.602×10-19 Joules) and n = 1,2,3… and so on so that the ground state has energy
= -13.6 eV and the second energy level (the first excited state) has energy
= -13.6/4 eV = -3.4 eV.
So,
1eV = 1.602×J
Energy difference can be calculated by -13.6eV (-
)
= Final energy;
= Initial energy
1.88 eV is equals to x
So, x= 3.03*
Thus, is the energy needed to raise an electron in the hydrogen atom from the second energy level to the third energy level.
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Answers
Interference is a phenomenon that occurs when two or more waves meet and combine, either reinforcing or canceling each other out, based on their relative phases.
Interference occurs due to the superposition principle, which states that when two or more waves overlap, the resulting displacement at any point is the algebraic sum of the individual displacements.
Interference can be classified into two main types: constructive interference and destructive interference.
1. Constructive Interference:
Constructive interference occurs when two or more waves with the same frequency and nearly the same phase align in such a way that their amplitudes add together.
2. Destructive Interference:
Destructive interference occurs when two or more waves with the same frequency and nearly opposite phases combine in a way that their amplitudes cancel each other out.
For effective interference to occur, certain molecular components are needed, depending on the specific context:
1. Light Interference(Optical Interference):
For optical interference to be effective, a coherent light source (such as a laser) is required. Coherent light has a consistent phase relationship between its waves.
2. Sound Interference(Acoustic Interference):
Effective acoustic interference requirescoherent sound sources, such as speakers emitting sound waves with consistent phases.
3. Quantum MechanicalInterference(Wave Interference in Quantum Mechanics):
Quantum interference involves particles, such as electrons or photons, exhibiting wave-like behavior and interfering with themselves.
In summary, interference is a phenomenon where waves combine to reinforce or cancel each other out, leading to changes in amplitude or intensity
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Final answer:
Interference is a phenomenon that occurs when two or more waves interact with each other, resulting in a combined wave. It can be constructive or destructive. In the case of light waves, interference is caused by the superposition of electromagnetic waves. Coherent light sources, like lasers, and a medium for wave propagation are required for effective interference.
Explanation:
Interference is a phenomenon that occurs when two or more waves interact with each other. It can be observed in various contexts, such as light waves, sound waves, and water waves. When waves meet, they combine and create a resultant wave. The interference can be constructive, where the waves reinforce each other, or destructive, where they cancel each other out.
To understand interference, we need to consider the molecular components involved. In the case of light waves, interference occurs due to the superposition of electromagnetic waves. Light is composed of photons, which are particles that exhibit wave-like properties. When two light waves meet, their electric and magnetic fields interact, leading to interference patterns.
The molecular components required for interference to be effective depend on the type of wave. For example, in the case of light waves, a coherent light source, such as a laser, is needed to produce waves with a constant phase relationship. This ensures that the waves maintain their interference pattern. Additionally, a medium through which the waves can propagate, such as air or a transparent material, is necessary for the waves to interact and interfere with each other.
Understanding the molecular components involved in interference helps us comprehend the behavior of waves and the formation of interference patterns in different contexts.
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Answers
Explanation:
In solids, molecules are held together due to strong intermolecular force of attraction between them. These molecules do not move past each other as they are fixed at their position. As a result, solids have definite shape and volume.
In liquids, molecules are less tightly held as a result the molecules are able to move and hence they slide past each other. Liquids do not have fixed shape and volume.
In gases, molecules are held by weak Vander waal forces. Therefore, they move rapidly from one place to another with more collisions.
Thus, we can conclude that liquid is the phase of matter which consists of particles that are held together but have the ability to flow past each other.
Answers
(2) N2(g) + H2(g) =>NH3(g)
(3) 2NaCl(s)=>Na(s) + Cl2(g)
(4) 2KCl(s) => 2K(s) + Cl2(g)
Answers
The correct balanced chemicalequation is 2KCl(s) => 2K(s) + Cl2(g).
The correct balanced chemical equation from the options provided is (4) 2KCl(s) => 2K(s) + Cl2(g).
In this equation, two molecules of potassium chloride (KCl) react to form two molecules of potassium (K) and one molecule of chlorine gas (Cl2). This equation is balanced because the number of atoms of each element is equal on both sides of the equation.
For example, there are two atoms of potassium and two atoms of chlorine on both sides of the equation, ensuring the equation is balanced.
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Answers
mass % = mass hydrogen*100/total mass = 28.8*100/(28.8+171.2) = 14.4%
Answer:
For Edmentum/Plato users, the correct answer is A. 14.4%