Given :
Number of atoms of an element, n = 2.072 × 10⁴³ atoms.
To Find :
Number of moles of that element in given number of atoms.
Solution :
We know, 1 mole of any element contains 6.022 × 10²³ atoms.
So, number of moles in given number of atoms are :
[tex]n = \dfrac{2.072\times 10^{43}}{6.022\times 10^{23}}\\\\n = 3.441 \times 10^{19}\ moles[/tex]
Hence, this is the required solution.
75% of the gases that make up the atmosphere are found below
16 kilometers
6 kilometers
10 kilometers
12 kilometers
What is Li2SO4???????
Answer:
Lithium sulfate
Hope this helps.
Explanation:
Answer:
Lithium sulfate
Explanation:
A white inorganic salt with the formula Li₂SO₄. It is the lithium salt of sulfuric acid.
How many molecules of Mg3N2 (magnesium nitride) are formed when excess Mg (magnesium)
reacts with 24.3 moles of N2 (nitrogen gas)?
3Mg(s) + N2(g) → Mg3N2(s)
Please explain or show how to work it as well!
Explanation:
3Mg(s) + N2(g) = Mg3N2(s)
First check that the equation is balanced. In this case, it is.
Assuming that magnesium is the limiting reactant:
First find the molecular weight using the Periodic Table.We find that the atomic mass of magnesium is approximately
24.3g, so the molecular weight is just 24.3g\mol
2. Next we need the mole to mole ratio. As there are 3
magnesiums for 1 magnesium nitride (shown by the coefficients), the
mole to mole ratio is 1 mol Mg3N2\3 mol Mg.
3. We need the amount of the substance, in grams. Since you have not
stated it in the question, I'll just do 10g AS AN EXAMPLE. Note that
depending on the amount, the LIMITING REAGENT MAY DIFFER.
4. Finally, we need the molecular weight of Mg3N2, which we can easily
calculate to be around 100.9\mol.
5. Putting this all together, we have 10gMg⋅ (mol Mg\24.3gMg)
(1mol Mg3N2\ 3mol Mg) (100.9g Mg3N2\mol Mg3N2)
the units will cancel to leave gMg3N2 (grams of magnesium nitride):
10gMg ⋅ (mol Mg\24.3gMg) (1mol Mg3N2\3mol Mg)
(100.9g Mg3N2\mol Mg3N2)
Doing the calculation yields approximately 13.84g.
Assuming that nitrogen is the limiting reactant:
Similarly, following the above steps but with 10g of nitrogen yields 36.04g
In conclusion, as we produce less amount of Mg3N2 when we assumed that Mg was the limiting reagent, magnesium is the limiting reagent and nitrogen is the excess.
Note: This is in THIS CASE, where we have 10g of both. The answer may vary depending on the amount of each substance.
Answer:
1.46×10^25 molecules
Explanation:
Each mole of N₂ reacts with 3 moles of Mg to form 1 mole of Mg₃N₂. That is, the number of moles of product is equal to the number of moles of nitrogen gas when excess magnesium is present.
There are 6.022×10²³ molecules in each mole of a substance, so the number of molecules of Mg₃N₂ is
(24.3 mol)(6.022×10²³ molecules/mol) = 1.46×10²⁵ molecules
A teacher wrote the following part of a chemical equation:
2H2 +02 - ?
What compound is most likely produced by the chemical reaction
represented by this equation?
A.2CO2
B.2012
C.2HCI
D.2H2O
Answer:
c
Explanation:
it is c but im not exactly sure
you have a 25% chance tho
sorry
2H₂+O₂⇒ 2H₂O
Further explanationGiven
Chemical equation :
2H₂+O₂⇒
Required
Compound produced
Solution
In determining the product that may be produced is to use the principle of the law of conservation of mass where the number of atoms/elements in the reaction either before the reaction (reactants) or after the reaction (products) is the same so that a balanced chemical equation is formed.
In the above reaction, there are two elements that play a role in the reaction, namely H and O
So that the resulting product also has these 2 elements, so we can ignore options A and C because there are elements C and Cl, while choice B does not contain the element H
The right choice: D
Do you think Hugh would have been able to perform this experiment in his laboratory at home 20 years ago? Explain your answer.
Answer:scientists finished deciding the human genome in 2001. This research helped genetics analyze and islote sections of DNA for investigation. Without this information and the technology invented during the Human Genome Project, Hugh would not have been able to extract portions of his daughters DNA. Also, he wouldn’t have been able to see the genes that did not function properly in his daughters DNA.
Explanation: this is a right answer for PLATO.
How many liters would 4.56 mol sulfur dioxide occupy at STP?
The volume of Sulfur dioxide-SO₂ at STP : = 102.144 L
Further explanationGiven
4.56 mol Sulfur dioxide-SO₂
Required
The volume
Solution
Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure). At STP, Vm is 22.4 liters/mol.
so for 4.56 mol :
= 4.56 x 22.4 L
= 102.144 L
In which isine is the strong nuclear force na strong enough to balance destuetatic forces between Gond?
carton 12
hydrosyen 2
neon21
uranum-22
Answer:
neon 21 ang sagot diyan
Explanation:
iyan ang sagot ko its a frank hindi yan ang sagot ko
24. Two boys were each pushing a box to the right, one boy applied a force of 3N and
the other boy applied a force of 5N. Another boy was pushing the box to the left
with a force of 8N. What was the net force of the box?
Answer:
Explanation:
Two boys were each pushing a box to the right, one boy applied a force of 3N and the other boy applied a force of 5N.
Total force applied to the left = 3 + 5 = 8 N . The forces are added up because they act in the same direction .
Another boy was pushing the box to the left with a force of 8N.
8 N force acts opposite to the total force of 8 N exerted by two earlier boys so
net force = 8N - 8N = 0 .
Net force on the box = 0 .
7: Structures in an organism's cell that carry its hereditary information are called .
Answer:
genes
Explanation:
What does oxygen and sulfur make?
Answer: sulfur dioxide
Explanation:
Explain why beryllium is produced when potassium is heated with beryllium
chloride.
You should refer to reactivity in your answer.
Explanation:
The more reactive element replaces less reactive element during chemical reaction.
Since, potassium is more reactive than beryllium. When potassium reacts with beryllium choride, it replaces beryllium and forms potassium chloride and produces beryllium.
Beryllium is produced due to the fact that the more reactive element in the reaction would have to take over the element that is less reactive.
The chemical reaction of Potassium and Beryllium chloride
In this reaction the element that is more reactive is potassium. When the reaction takes place it would take over and replace beryllium due to this quality.
Hence beryllium chloride would become potassium chloride from the resulting reaction.
Read more on chemical reactions here:
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A scientist was working in a nuclear reactor facility and was exposed to radioactive particles. Although the scientist was wearing only basic clothing as protection, she exhibited no symptoms of radiation poisoning. What type of radiation was the scientist most likely exposed to?
Group of answer choices
A. Beta
B. Gamma
C. Alpha
D. None of the above
Answer:
C. Alpha
Explanation:
In a nuclear reactor facility, radioactive decay takes place, which is any several processes by which unstable nuclei emit subatomic particles and ionizing radiation and disintegrate into one or more smaller nuclei. A scientist working under this condition is likely to be exposed to alpha particles because it contains a minimal absorption range and they are the least dangerous regarding external exposure.
Write the equation for the dissolution of magnesium chlorate in water. How many moles of ions are produced for every 1 mol of magnesium chlorate dissolved. H2O Mg(ClO3 ) 2 (s) ⟶
Answer:
Explanation:
Mg(ClO₃ )₂ (s) ⇄ Mg⁺² + 2ClO₃⁻
1 mole 1 mole 2 mole
Mole of magnesium ion produced = 1 mole .
Mole of chlorate ion produced = 2 mole .
Total moles of ion produced = 2 + 1 = 3 moles .
A gas occupies a volume of 0.20 L at 25 kPa. What volume will the gas occupy at 2.0 kPa?
Answer:
2 L
Explanation:
Data collected that describes the quality of the data set is called _______ data.
quantitative
qualitative
mode
mean
An investigation where you compare objects to find a relationship is a(n) _______.
control group
descriptive investigation
comparative investigation
If the number 5 occurs with the most frequency in the data set, it is called the _________.
qualitative
mode
mean
median
Answer:
1. Qualitative.
2. Comparative investigation.
3. Mode.
Explanation:
1. Data collected that describes the quality of the data set is called qualitative data. This data type are non-numerical in nature i.e they are categorical. Some examples are excellent, poor, gender, religion etc.
2. An investigation where you compare objects to find a relationship is a comparative investigation. For example, a researcher trying to find out which bag is heavier by determining their weight.
3. If the number 5 occurs with the most frequency in the data set, it is called the mode.
For example, given A = (1, 5, 2, 5, 1, 5 4, 5). The mode is 5 because it appeared the most i.e four (4) times.
HELP PLZ!CHEMISTRY.WILL GIVE BRAINLIEST!!!!
may/june 2018 paper 22.
i need explanations and steps for these.
thank you so much!!
1. 12 L = 12 dm³
2. 3.18 g
Further explanationGiven
1. Reaction
K₂CO₃+2HNO₃⇒ 2KNO₃+H₂O+CO₂
69 g K₂CO₃
2. 0.03 mol/L Na₂CO₃
Required
1. volume of CO₂
2. mass Na₂CO₃
Solution
1. mol K₂CO₃(MW=138 g/mol) :
= 69 : 138
= 0.5
mol ratio of K₂CO₃ : CO₂ = 1 : 1, so mol CO₂ = 0.5
Assume at RTP(25 C, 1 atm) 1 mol gas = 24 L, so volume CO₂ :
= 0.5 x 24 L
= 12 L
2. M Na₂CO₃ = 0.03 M
Volume = 1 L
mol Na₂CO₃ :
= M x V
= 0.03 x 1
= 0.03 moles
Mass Na₂CO₃(MW=106 g/mol) :
= mol x MW
= 0.03 x 106
= 3.18 g
Answer:
welcome to 2021 dude
its been a long time since i answered this but here is my new account
Explanation:
Which part of the mantle is still a solid but flows like a thick, heavy liquid?
-lithosphere
-asthenosphere
-core
-crust
i will give brainest
Answer:
Asthenosphere
Explanation:
The asthenosphere is the hot, weak, inner part of the upper mantle. Although it is solid, it can flow like a thick, heavy liquid.
There is some gas in a container at pressure 136 atm. When 142 dm3 gas is released at pressure of 1 atm,then the pressure of the vessel is 131.6 atm. What is the volume of the Tank?
Answer:
228.7[tex]dm^{3}[/tex]
Explanation:
According to Boyle's law
P1V1 = P2V2
where P1& P2 are initial and final pressure
and V1& V2 and initial and final volumes respectively.
Given:
P1 = 136atm, P2 = 131.6atm
V1 = 142[tex]dm^{3}[/tex]; V2 = ?
V2 = [tex]\frac{P1V1}{P2}[/tex] = [tex]\frac{136*142}{131.6}[/tex]
= 146.7[tex]dm^{3}[/tex]
Total volume, V = V1 + V2
=146.7 + 142
= 228.7[tex]dm^{3}[/tex]
Can someone help me with this??
ﾟ+*:ꔫ:*﹤ ﹥*:ꔫ:*+ﾟAnswer:ﾟ+*:ꔫ:*﹤ ﹥*:ꔫ:*+ﾟ
The following: Jupiter, Saturn, Uranus, or Neptune.
ﾟ+*:ꔫ:*﹤ ﹥*:ꔫ:*+ﾟExplanation:ﾟ+*:ꔫ:*﹤ ﹥*:ꔫ:*+ﾟ
any of the planets Jupiter, Saturn, Uranus, and Neptune whose orbits lie beyond the asteroid belt.
Answer:
it is Saturn
Explanation:
and outer planter is just a planet outside the asteroid belt
An atom of carbon (C) forms covalent bonds with two atoms of oxygen (O) to form carbon dioxide. How are the valence electrons of these atoms rearranged to form the bonds?
Electrons are transferred from the carbon atom to the oxygen atoms.
Electrons are transferred from the oxygen atoms to the carbon atoms.
Many valence electrons are shared between the atoms.
A few valence electrons are shared between the atoms.
Answer:
Many valence electrons are shared between the atoms.
Explanation:
For the atoms to form a covalent bond, a many of the valence electrons are shared between the atoms.
When a covalent bond is to be formed, the valence electrons which are the outermost electrons are shared between the atoms that are combining.
Carbon is made up of 4 valence electrons. Oxygen is made up of 6 valence electronsFor both atoms to be isoelectronic with the noble gases, carbon shares all of its 4 electrons with oxygen. Oxygen bonds shares 4 electrons using two of its atom with the carbon.Answer:
c
Explanation:
on edge
Hydrogen is placed separately from the other elements in the periodic table because it
A. Is a gas
B. Has atomic number 1
C. Has many unique properties
D. Does not exist as a free element in nature
Hydrogen is the chemical element that is placed separately from the other elements because it has atomic number 1.
What is hydrogen?It is the simplest chemical element (consisting of only one proton and one electron) with atomic number 1.
It is the lightest of the elements and the most abundant in the universe and in the earth's crust, in the atmosphere, hydrogen is found as a colorless, odorless and flammable gas, in its molecular form H2.
Therefore, we can conclude that Hydrogen is the chemical element that is placed separately from the other elements because it has atomic number 1.
Learn more about hydrogen here: https://brainly.com/question/4630891
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How many grams are in 9.03×1023atoms of Copper (Cu)?
Mass of Cu : 95.319 g
Further explanationGiven
9.03 x 10²³atoms of Copper
Required
mass of Cu
Solution
The mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
Mol of Copper :
n = N/No
n = 9.03 x 10²³/6.02.10²³
n = 1.5
Mass of Copper :
= mol x Ar Cu
= 1.5 x 63,546 g/mol
= 95.319 g
9.03 × 10²³ atoms of copper have a mass of 95.3 g.
We want to convert 9.03 × 10²³ atoms of copper to grams. We will need a series of conversion factors.
What is a conversion factor?A conversion factor is an arithmetical multiplier for converting a quantity expressed in one set of units into an equivalent expressed in another.
Step 1: Convert 9.03 × 10²³ atoms to molesThe required conversion factor is Avogadro's number: there are 6.02 × 10²³ atoms in 1 mole of atoms.
9.03 × 10²³ atoms × (1 mol/6.02 × 10²³ atoms) = 1.50 mol
Step 2: Convert 1.50 moles to gramsThe required conversion factor is the molar mass of copper: 63.55 g/mol.
1.50 mol × 63.55 g/mol = 95.3 g
9.03 × 10²³ atoms of copper have a mass of 95.3 g.
Learn more about Avogadro's number here: https://brainly.com/question/7287712
explain why fossil fuels are exhaustible natural resources
Answer:
Fossil Fuels are exhaustible natural resources, because they can't be renewed. Once these fuels are used up, there are NONE left! We can change that by reducing the amount we use. It takes millions of years for it to be remade, and we will soon die out before that happens. Thats why fossil fuels are exhaustible. :)
Explanation:
Hope this helps! :)
The energy stored in chemical bonds is known as
chemical energy
O electromagnetic energy
O thermal energy
O kinetic energy.
Answer: chemical
Explanation:
Energy, potential energy, is stored in the covalent bonds holding atoms together in the form of molecules. This is often called chemical energy. Except at absolute zero (the coldest temperature it is possible to reach), all molecules move.
calculate the mass in grams of 1 mole of iron
Answer:
1 mole is equal to 1 moles Iron, or 55.845 grams.
Question
The illustration below uses arrows to show how Earth's tectonic plates move.
Oceanic crust
B
tenen
Lithosphere -
Continental crust
Lithosphere
A
As thenosphere
Which statement below best describes where and why a particular type of rock may be found?
O Metamorphic rock may be found at location B, where magma escapes from the area where oceanic crust dives under continental crust.
O Sedimentary rock may be found at location B, where rock has been weathered by water to form sand.
Sedimentary rock may be found at location A, where it is formed from melting and solidifying sediments.
O Metamorphic rock may be found at location A, where pressure and heat is supplied by the layers above.
Answer: a
Explanation:
2344
The statement that best describes where and why a particular type of rock may be found is that Metamorphic rock may be found at location B, where magma escapes from the area where oceanic crust dives under continental crust.
What is Tectonic Plate?A tectonic plate (also called lithospheric plate) is a massive, irregularly shaped slab of solid rock, generally composed of both continental and oceanic lithosphere.
They are made up of oceanic crust and continental crust. Earthquakes occur around mid-ocean ridges and the large faults which mark the edges of the plates.
Plate size can vary greatly, from a few hundred to thousands of kilometers across; the Pacific and Antarctic Plates are among the largest.
Therefore, The statement that best describes where and why a particular type of rock may be found is that Metamorphic rock may be found at location B, where magma escapes from the area where oceanic crust dives under continental crust.
Learn more about Tectonic Plates, here:
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In an exothermic reaction, what happens to the surroundings?
O A. The temperature decreases.
B. The activation energy is restored.
C. The temperature increases.
D. The thermal capacitance is increased.
What is the part of the male reproductive organ that stores newly-formed sperm cell?
A. Testes
B. Epididymis
C. Vas Deferens
D. Urethra
Please explain(clearly) your answer Thank you
Answer:
B. Epididymis
Explanation:
Sperm are stored in the epididymis until fully developed. The epididymis is located on the back part of the testis, the male’s reproductive organ.
PLEASE HELP, THIS IS TIMED!!!!!!!!!!!!!!!!!!!!!!!!!!Convert 22.6g AgNO3 to moles.
a. 0.133 mol
b. 1 mol
C.
0.15 mol
d. 2 mol
Answer:
the answer b because
The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles AgNO3, or 169.8731 grams.
Explanation:
Suppose the innermost orbit an electron can occupy has an energy level of -19 eV. Based on the absorption spectrum shown below, what is the energy of energy level 4?
A. -2 eV
B. -8 eV
C. -11 eV
D. -13 eV
Answer:
It's B.
Explanation:
I got it wrong, it's B
