Answer:
C₂H₃₂
Explanation:
Given parameters:
Mass percentage of carbon = 42.88%
Mass percentage of hydrogen = 100 - 42.88 = 57.12%
Molecular weight = 56.02
Unknown:
Molecular formula = ?
Solution:
To solve this problem, we need to find the empirical formula of the compound first. The empirical formula is the simplest formula of a substance.
Therefore;
Elements Carbon Hydrogen
Percentage
composition 42.88 57.12
Molar mass 12 1
Number of moles 42.88/12 57.12/1
3.57 57.12
Simplest
ratio 3.57/3.57 57.12/3.57
1 16
Empirical formula of the compound is CH₁₆
Molar mass of CH₁₆ = 12 + 16(1) = 28g/mol
Multiplying index = [tex]\frac{molecular weight}{28}[/tex] = [tex]\frac{56.02}{28}[/tex] = 2
Molecular formula = (CH₁₆)₂ = C₂H₃₂
A tank containing 550mL of oxygen has a pressure of 3.5atms. If the pressure is changed to standard atmospheric pressure, approximately 1.0atms, what will be the resulting volume? Show your work.
Answer: the picture is work for number 1,2,4,5,7
Explanation: number 3: as the pressure in the volume decreases, the volume increases causing it to expand and eventually blow.
number 6: because the temperature and the amount of gas don’t change, these terms don’t appear in the equation. What Boyle’s law means is that the volume of a mass of gas is inversely proportional to its pressure. This linear relationship between pressure and volume means doubling the volume of a given mass of gas decreases its pressure by half.
hope this helps :))
To convert from mass of A to moles of B in a stoichiometry problem, the following steps are followed:
Select one:
a. mass A → moles A → mass B → moles B
b. mass A → moles A → moles B
c. mass A → mass B → moles B
d. mass A → moles A → mass B → moles B
e. mass A → moles B
Answer:
b. mass A → moles A → moles B
Explanation:
hope this helps
To convert from mass of A to moles of B in a stoichiometry problem the steps required is mass A → moles A → moles B.
What is the relation between moles & mass?Relation between moles (n) and mass will be represented by showing the below formula:
n = W/M, where
W = given mass
M = molar mass
So the calculate the moles of B from the stoichiometry of the reaction:
First we convert mass of A into molesThen moles of B will be measured by using the moles of AHence the required steps are mass A → moles A → moles B.
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Vitamin D is created with the help of sun. You need vitamin D to help your body absorb ___________ which is important for the health of your bones.
Answer:
Calcium hope it helped
Explanation:
If you move 100 meters in 10 seconds what’s your speed
Answer:
10 m/s
Explanation:
Given
Distance travelled (d) = 100 m
Time taken (t) = 10 sec
Now
Speed (s) = d/ t
= 100/ 10
= 10 m/s
Hope it will help you :)
PLEASE HElP ASAP!!!!!!
Answer:
1 hour
Explanation:
What two elements are used to make a laser pen light?
Answer:
Helium and Neon
Explanation:
Semiconductor diodes are the current elements of laser pointers and are formed by a mixture of Gallium and Arsenic with very small amounts of other elements to obtain different wavelengths.
Laser pointers or pen light are inputs that emit collimated and colored laser radiation, which every day finds more applications in industry, ordinary life and research.
The first pointers were made with Helium and Neon but they were delicate and bulky, today they have been replaced by pointers with solid state diodes, depending on the material they can emit radiation from 1320 nm to 254 nm.
The most common materials for economically priced pointers that emit in the visible range (400 nm to 700 nm) are Gallium and Arsenic, in the GaAs semiconductor compound with 1.4 eV energy gap.
For the emission, a np union is created and depending on the doping, emission is achieved in a wide range of wavelengths.
In conclusion, semiconductor diodes are the current elements of laser pointers and are formed by a mixture of Gallium and Arsenic with very small amounts of other elements to obtain different wavelengths.
Fundamental materials: Gallium and Arsenic
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what is this thermodynamic?
Answer:
oh coooool
I have one Id it is on ace with maybe 5800 points
maybe this picture will help in something
Anyone Know the equations?
Iron
iron (III) chlorate solid decomposes into iron (III) chloride solid and oxygen gas equation
Answer:
2Fe(ClO₃)₃ → 2FeCl₃ + 9O₂
Explanation:
To solve this problem, we need to first identify the reactants and products in this problem.
The reactant is iron (III) chlorate
product is iron (III) chloride and oxygen gas
So the chemical formula:
iron (III) chlorate = Fe(ClO₃)₃
iron (III) chloride = FeCl₃
oxygen gas = O₂
Therefore:
Fe(ClO₃)₃ → FeCl₃ + O₂
We need to balance this expression:
2Fe(ClO₃)₃ → 2FeCl₃ + 9O₂
4 Part of a human body system is pictured.
-Kidney
Ureter
Bladder
The main function of this system is to
F control reproduction
G transport oxygen
H produce hormones
J remove waste
Kidney in our body functions as a sieve in to remove wastes. Ureter, bladder and kidney as well are part of excretory system in animals. Hence, option J.
What is excretory system?Human body contains a group of organ systems to perform specific functions. Excretory system is an organ system for the excretion or removal of wastes after digestion form the body.
The main component of excretory system is kidney by which the wastes from the circulatory system is removed through urine. Ureter and bladder are extensions of kidney. After absorption of water and other nutrients remaining uric acid or urine is stored in the bladder to remove.
Kidney contains a number of sieve like structures called nephrons they are the filtering units of kidney.Nephrons are microscopic structural units of kidney by which wastes are filtered to produce urine and remove.
Therefore, all the given organs, kidney, ureter, bladder etc are part of excretory system and they plays a role in removing wastes from the body. Hence, option J is correct.
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Elaine's teacher gave her two cubes and asked her to record as many observations as possible. The data table of her observations is shown on the above.
A. Calculate the volume; a density of 0.33 g/cm^3; the temperature of 25°C; Same
B. Calculate the density; the volume of 27 cm^3; a density of 0m44 g/cm^3; Different
C. Calculate the temperature of the cube's surface; the temperature of 24° C; the volume of 27 cm^3 can not he determined
D. Caluclate the density; density of 0.33 g/cm^3; density of 0.44 g/cm^3; Different
Answer:
B
Explanation:
Calculate the density; the volume of 27 cm^3; a density of 0m44 g/cm^3; Different
hope this helps
How many moles are in the following atoms? 2.75 x 1025 of tungsten
Answer:
Explanation:
the amount of a substance that contains 6.02 x 1023 respective particles of that substance
I actually dont know the answer but this is the most help I can offer.
this is a clue
What is the true ratio of atoms in a molecule or formula unit called?
O the molecular formula
o the molar mass
O the percent composition
the empirical formula
Mark this and return
Save and Exit
Nel
Submit
Answer:
O the molecular formula
Explanation:
The true ratio of atoms in a molecule or formula unit is called the molecular formula.
The molecular formula of a compound shows the true number of atoms that are combining to form a compound.
For example, the molecular formula of water is H₂O.
Empirical formula of a compound is its simplest ratio. When the number of atoms are divided by the smallest possible factor, it yields the empirical formula.PLS HELP ITS DUE SOON!! I REALLY NEED HELP ILL GIVE BRAINLIEST I PROMISE
i think its 50% bc its half of the box
Answer:
100%
Explanation:
2. How do we find the number of neutrons in an atom?
(10 Points)
a. Add the protons and electrons
b. Subtract the protons from the electrons
c. Subtract the atomic number from the atomic mass
d. Subtract the atomic mass for the atomic number
Answer:
For all atoms with no charge, the number of electrons is equal to the number of protons. The mass number, 40, is the sum of the protons and the neutrons. To find the number of neutrons, subtract the number of protons from the mass number.
Explanation:
Answer:
Letter C. Subtract the atomic number from the atomic mass
Use the drop Dow menus to select the names of the labeled structures
Answer:
theres no picture
Explanation:
Groundwater makes up most of the water on the planet True or false
Answer:
true
Explanation:
identify the oxidizing agent and the reducing agent for Ca(s)+Fe2+(aq)→Ca2+(aq)+Fe(s)
Answer:
Ca reducing agent
Fe2+ Oxidizing agent
Explanation:
Ca ------> Ca2+ +2electrons.
Calcium loses two electrons and oxidises itself and reduces others so Ca is a reducing agent.
Fe2+ +2electrons ------> Fe
Fe 2+ reduces itself by gaining electron and oxidizes other so Fe2+ is Oxidizing agent.
Classify the following compound as an alkane, alkene, or alkyne.
Answer:
I think it's alkyne!
Please give brainliest!
The compounds containing triple bonds between carbon atoms are called alkynes. The given compounds contains one triple bond between two carbons atoms hence, it is an alkyne.
What are alkynes ?Hydrocarbons are organic compounds containing carbon- hydrogen bonds. There are three types of hydrocarbons namely alkanes, alkene and alkynes.
Alkanes are compounds containing only single bonds between all carbon atoms in the chain. Alkanes are called saturated hydrocarbons. Alkenes are unsaturated because they contains one or more double bonds between carbon atoms.
Alkynes are compounds with one or more triple bonds between carbon atoms in the chain. Alkynes are also unsaturated. The given compound contains one triple bond between a pair of carbon atoms. Thus, it is an alkyne.
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In order for complete combustion of a hydrocarbon to occur, there must be plenty of ______ available.
Answer: oxygen
Explanation:
Answer:
In order for complete combustion of a hydrocarbon to occur, there must be plenty of oxygen available.
Vanadium-48 has a half life of 16 days. If a 800.0 gram sample is allowed to stand for 80.0 days how much vanadium-48 will remain?
Answer:
25 g
Explanation:
N/No = (1/2)^t/t1/2
N= amount of radioactive material at time t
No = amount of radioactive material initially present
t= time taken
t1/2 = half life of the radioactive material
Substituting values;
N/800 = (1/2)^80/16
N/800= (1/2)^5
N/800= 1/32
32N = 800
N= 800/32
N= 25 g
What is this please explain
Choose the correct definition of the word DEPOSITION?*
Deposition is the process of liquid falling from the sky as precipitation.
Deposition is the process that breaks down rock and other substances at Earth's
surface.
Deposition is the process that transports rock and other substances on the Earth's
surface.
Deposition is the process that drops or lays down rock and other substances at
Earth's surface
Answer:
D
Explanation:
A quick way of remembering the process of deposition, think about the word deposit. Deposit is a prefix of deposition and generally is defined as dropping or putting/setting things down. Using this clue, you can guess that deposition has something to do with putting dropping / putting something down.
The only answer that clearly mentions the process of dropping or laying down something is D, so D is the correct answer.
Also, deposition is literally defined as the depositing of rocks.
Hannah wants to make some toast for breakfast, but she has 3 minutes before she has to leave for school.
She knows toasting bread is a chemical change so what is the best way for Hannah to increase the rate of this chemical change?
Answer: increase the temperature of the toaster oven.
Explanation:
Can y’all help me with this science question plz
The asthenosphere is more viscous and thick than the mesosphere
TRUE OR FALSE?
NOBLE GASSES) Why’ are they Inert tho
Answer:
Why? Because of electron shells. Technically, they're not fully inert. They have very low reactivity potential, and can only be forced to become reactive with difficulty.
Explanation:
All chemical reactivity is made possible through the atom's electron arrangement. Electrons basically have shelves where they live, called "levels" or "shells". Each level is farther from the nucleus than the previous one. Atoms are most stable when their outer most shell (called the valence shell) is full. Atoms with an incomplete shell will react with other atoms, in an attempt to either fill out the outer shell, or to rid itself of it's valence electrons so that that previous level becomes a full valence level. If the valence shell ils already full, the atom will not be inclined to create compounds.
The first shell can hold up to two electrons. After the first two electrons, any additional electrons have to begin a new shell. The second shell can hold eight electrons before it becomes full. Helium is the first noble gas on the periodic table, having two protons and two electrons. Because helium's outer most shell is full, it does not react with other atoms.
By comparison, look at hydrogen and oxygen. Oxygen has eight electrons. The first two electrons occupy the first shell. The remaining six go to the second shell. This leaves the second shell with two empty spaces that can potentially be filled. Meanwhile, hydrogen has one electron, with it's valence shell having an empty space for one additional electron. Two hydrogen atoms give up their single electrons to an oxygen atom, so that all three end up with stable valence levels.
By the time an atom can fill out the second electron shell on it's own (10 total electrons) you end up with neon, the second noble gas.
Answer:
i dont know?
Explanation:
why are they?!?!?!?!
The acceleration of an object is equal to the net force exerted on the object (blank) the object's (blank).
Answer:
Divide; mass.
Explanation:
The acceleration of an object is equal to the net force exerted on the object divided the object's mass. This theory is known as Newton's second law of motion.
Force is given by the multiplication of mass and acceleration.
Mathematically, Force is;
[tex] F = ma[/tex]
Where;
F represents force.
m represents the mass of an object.
a represents acceleration.
Making acceleration (a) the subject, we have;
[tex]Acceleration (a) = \frac{F}{m}[/tex]
Therefore, the acceleration of an object is equal to the net force exerted on the object divided the object's mass.
The acceleration of an object is equal to the net force exerted on the object divided by the object's mass.
The net force applied to an item divided by its mass gives the object's acceleration.
To put it another way, the equation that connects mass (m), net force ([tex]F_{net[/tex]), and acceleration (a) is:
a = [tex]F_{net[/tex] / m
This equation is derived from Newton's second rule of motion, which states that an object's acceleration is inversely proportional to its mass and directly proportional to the net force acting on it.
Thus, it shows that an item accelerates more quickly the more net force that is applied to it, and that an object accelerates more quickly the more mass that is added to it.
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7
What is a pure lump of the element iron made of?
А
atoms of iron
B
iron mixed with air
compounds of iron
D
iron cells
Answer:
B
Explanation:
Because the iron is wrong because of the contemplation of bisectors interfere with the question making it B.
What is the percent Nitrogen in Mg(NO2)2?
How many grams of H2 gas are produced if 48
grams of CH4 gas are consumed?
Answer:
Mass = 12.12 g
Explanation:
Given data:
Mass of CH₄ = 48 g
Mass of H₂ produced = ?
Solution:
Chemical equation:
CH₄ → C + 2H₂
Number of moles of CH₄:
Number of moles = mass/molar mass
Number of moles = 48 g/ 16 g/mol
Number of moles = 3 mol
Now we will compare the moles of CH₄ and H₂.
CH₄ : H₂
1 : 2
3 : 2/1×3 = 6 mol
Mass of H₂:
Mass = number of moles × molar mass
Mass = 6 mol × 2.02 g/mol
Mass = 12.12 g
