Answer:
You have 3 moles, so there are 18481.518 oxygen molecules
Explanation:
There are 18.066×10²³ molecules of oxygen present in 3 moles of oxygen.
What is a mole?Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons.
Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.
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what is the mass of 3.01 x 10^21 atoms of Co
Answer:
0.295 g Co
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
3.01 × 10²¹ atoms Co
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of Co - 58.93 g/mol
Step 3: Convert
[tex]3.01 \cdot 10^{21} \ atoms \ Co(\frac{1 \ mol \ Co}{6.022 \cdot 10^{23} \ atoms \ Co} )(\frac{58.93 \ g \ Co}{1 \ mol \ Co} )[/tex] = 0.294552 g Co
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
0.294552 g Co ≈ 0.295 g Co
Which layer will be the ether layer in a separatory funnel containing diethyl ether and a saturated aqueous solution of nacl?.
The bottom layer will be the ether layer
a mixture in which the solute dissolves until it is no longer able to do so, leaving the undissolved components at the bottom. Solution without saturation. a solution that totally dissolves and leaves nothing behind (but has less solute than the saturated solution) A saturated solution is one that has as much of the solute present as is capable of dissolving. A solution is said to be unsaturated if it doesn't contain all of the solute that can dissolve in it. A saturated solution is one that has as much solute in it as can be dissolved under the circumstances under which it is present.
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FECl3+3NaOH=Fe(OH)3+NaCl
A. Synthesis
B. Decomposition
C. Combustion
D. Single Replacement
E. Double Replacement
a student walks 3.0 hours and travels 6.0km what is the averge speed
Answer:
2.0 km/hr
Explanation:
6.0 km/3.0 hrs
= 2.0 km/hr
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What is the energy of a photon with a 6 micrometer wavelength (1 m = 10^6micrometers)?
O 3 x 10-34 )
O 3 x 10-32
O 3 x 10-20 ]
O 3 x 10-20 j
The energy of a photon : 3 x 10⁺²⁰
Further explanationRadiation energy is absorbed by photons
The energy in one photon can be formulated as
[tex]\large{\boxed{\bold{E\:=\:h\:.\:f}}}[/tex]
Where
h = Planck's constant (6,626.10⁻³⁴ Js)
f = Frequency of electromagnetic waves
f = c / λ
c = speed of light
= 3.10⁸
λ = wavelength
Wavelength of photon=λ=6 μm = 6.10⁻⁶ m
[tex]\tt E=h\times \dfrac{c}{\lambda}\\\\E=6,626.10^{-34}\times \dfrac{3.10^8}{6.10^{-6}}\\\\E=3.3\times 10^{-20}~J[/tex]
Another element, Z, in the same period of the Periodic Table as A, reacts with chlorine to
form a compound with empirical formula ZCl 2. The percentage composition by mass of ZCl 2
is Z, 31.13; Cl , 68.87.
Calculate the relative atomic mass, Ar, of Z.
The relative atomic mass, Ar, of the element Z is 32.1.
What is the relative atomic mass of the element Z?The relative atomic mass of the element Z is determined as follows:
compound formed between Z and Cl is ZCl₂
This implies that Z is an element in group 2A of the periodic table
percentage composition by mass of the elements in ZCl₂ are given as follows: Z = 31.13; Cl = 68.87
atomic mass of Cl = 35.5
mass of Cl in the compound = 35.5 * 2 = 71.0
68.87% of the compound has a mass = 71.0 g
mass of the compound (100%) ZCl₂ = 71.0 * 100/68.87
mass of the compound ZCl₂ = 103.1
Relative atomic mass, Ar, of Z = 103.1 - 71
Relative atomic mass, Ar, of Z = 32.1
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Complete Symbols
Find each of these:
a) number of protons
b) number of neutrons
c) number of electrons
d) atomic number
e) mass Number
80Br35
Answer: a) 35 , b) 45 , c) 35 , d) 35 , e) 80
Explanation:
a) - protons equal to atomic number of element , b) - subtract atomic number by number of protons to get neutrons (80 - 35 = 45) , c) - protons same as electrons unless its an ion , d) - atomic number is equal to protons , e) - protons plus neutrons equal mass number (35 + 45 = 80). :)
What is needed for a wind farm to be effective
Answer:
for a effective wind farm you would need wind turbines a windy area a rotation powered generator and something to use it on
Explanation:
8. What is a quasar?
Which compound is covalently bonded?
Select one:
a. Al2O3 b. Fe2O3 c. SO2 d. CuCl2
Answer:
The answer is D-CuCl2
I hope this helps
Answer:
D.
CuCl2
Explanation:
May it will help you.
Write an expression that evaluates to true if and only if the string variable s equals the string end.
Answer:
Declare a variable populationChange, suitable for holding numbers like -593142 and 8930522.
int populationChange
Once the food reaches the esophagus in the digestive system, the biggest difference between the frog and the human digestive system is that after the large intestine, waste is eliminated through the
Answer:
The rectum
Explanation:
Candi uses wires to connect a battery to a light bulb. She knows she has made a complete circuit because the light bulb lights up.
Candi's teacher gives her a wire that has a lot more resistance than the wires she used at first. Candi removes one of the original wires from her circuit and puts the high-resistance wire in its place. What effect will this most likely have on the circuit?
A.
Less current will flow, so the light bulb will be dimmer.
B.
More current will flow, so the light bulb will be brighter.
C.
The battery will have more voltage, so the light bulb will be brighter.
D.
The battery will have less voltage, so the light bulb will be dimmer.
I need help with this quickly! thank you ;-;
Answer:
The second choice and can i have brainiest
Explanation:
1 Volume of certain amount of a gas at 25°C and
100 cm Hg pressure is 80 mL. The gas is
expanded to 160 mL keeping the temperature
constant. Calculate the pressure of the expanded
Numericals based on Boyle's law
Answer:
P₂ = 50 mmHg
Explanation:
Given data:
Initial volume of gas = 80 mL
Initial pressure of gas = 100 mmHg
Final volume = 160 mL
Final pressure = ?
Temperature = constant
Solution:
The given problem will be solved through the Boyle's law,
"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
Now we will put the values in formula,
P₁V₁ = P₂V₂
100 mmHg × 80 mL = P₂ × 160 mL
P₂ = 8000 mmHg. mL/ 160 mL
P₂ = 50 mmHg
Which question can be used to identify a physical property of an element?
Does a magnet attract the element?
Does rust form when the element is exposed to oxygen?
Do bubbles form when the element is mixed with an acid?
Does the element burn when held over a Bunsen burner flame?
Answer:
Does a magnet attract the element?
Explanation:
This is because, the attraction of an element by a magnet is a purely physical property. It has to do with the orientation of the electrons in the element. It does not tell us of the composition of the element or how it reacts with other elements. Whereas, the other questions deal with the chemical properties of the element. That is, how it reacts with other elements or substances.
HELP! why is the aqueous environment of a cell important?
it prevents organelles in a cell from sticking together.
it allows cells to bend and change shape as needed.
it provides a constant energy source for a cell.
it's required for all chemical reactions in a cell.
The aqueous environment of a cell is important because it allows cells to bend and change shape as needed (Option B).
What is the cell aqueous environment?The cell aqueous environment is the surrounding medium which is required for the cell to perform its metabolic activities and whose solute concentration allows the cell to change its shape depending on external stimuli such as glucose level.
In conclusion, the aqueous environment of a cell is important because it allows cells to bend and change shape as needed (Option B).
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Answer: it's required for all chemical reactions in a cell.
Explanation: took the test. please vote :-)
Which of the following elements has the largest atomic radius (brainliest for right answer)
Aluminum
Silicon
Phosphorus
Sulfer
Chlorine
what is the chloride anion
Answer:
Cl-
Explanation:
When chlorine reacts with other substances, it usually forms the chloride ion (Cl-). This is because it has seven valence electrons, and in order to gain a full octet, it has to gain one electron (which has a negative charge). For example, when it reacts with Sodium (Na), the product is table salt (NaCl) because chlorine takes one electron from sodium and becomes Cl-. Sodium also becomes Na+, because it loses one electron.
Which object has unbalanced forces acting on it?
A leaf falling to the ground
A sweater on a store shelf
A fence around a garden
A letter in a mailbox
Answer:
A leaf falling to the ground.
Explanation:
The leaf is the only object in motion and is falling therefore the force of gravity is the unbalanced force.
Chemical ____ are used to represent compounds
Answer:
Its formula :)
Explanation:
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the mass number of an atom is 15, and its atomic number is 7. the atom probably has... the mass number of an atom is 15, and its atomic number is 7. the atom probably has... at least 15 electrons. 7 electrons in the nucleus. 7 units of negative charge in the nucleus. 8 neutrons in the nucleus. about as much mass in electrons as in protons.
The atom probably has 8 neutrons in the nucleus.
Atomic number (Z) is total number of protons and mass number (A) is total number of protons and neutrons in a nucleus.
N(p⁺) = Z = 7; number of protons in the atom
A = N(p⁺) + N(n°)
N(n°) = A - N(p⁺)
N(n°) = 15 - 7
N(n°) = 8; number of neutrons in the atom
N(e-) = N(p⁺) = 7; number of electrons in the atom
Neutron (symbol: n°) is a subatomic particle with no net electric charge.
Protons and neutrons are found in nucleus of an atom (atomic nuclei).
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The solubility of potassium chloride is 34 g KCl
100 g H2O
at 20C. What is the maximum amount of KCl that can
dissolve in 200 g of water at 20C?
Answer: When 20 grams of potassium chlorate, KClO3, is dissolved in 100 grams of water at 80 ºC, the solution can be correctly described as:, unsaturated
At approximately what temperature does the solubility of sodium chloride, NaCl, match the solubility of potassium dichromate, K2Cr2O7?, 60 ºC
Explanation:
Why did it take 2,000 years for scientists to confirm some of Democritus's ideas about?
Answer:
Explanation:
because it took that long for them to think of one.
The electron configuration for Aluminum (Al) is 1s^2 2s^2 2p^6 3s^2 3p^1
How many electrons does aluminum have? and how many of those electrons are valence electrons?
A:11 and 1
B: 11 and 3
C:13 and 1
D:13 and 3
Answer:
Aluminum has 13 electrons with 3 electrons in its valence shell....
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What is the best way to
determine which brand of
paper towel is the
strongest when wet?
Answer:Bounty
Explanation:After being soaked, the Bounty towel held an impressive 43 ounces or 2.69 pounds.
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Which element would most likely bond with lithium and form an ionic compound?
Answer:
(Please make sure to re-write this on your own to make sure that your teacher doesn't think your cheating!) Fluoride.Explanation:Ionic bonding is the type of bond that is made between a nonmetal and a metal. In this type of union, one of the elements yields electrons and the other accepts electrons.
In this case, the metal is Lithium, we need a nonmetal to complete the union. (Don't know if you need this or anything but here you go)
Beryllium is a metal.
Calcium is a metal.
Fluoride is a nonmetal.
Sodium is a metal.
After the analysis, we conclude that the correct answer is Fluoride since it is the only one that is a nonmetal.
Elena makes the table below to determine the number of atoms of each element in the chemical formula 3(NH4)2SO4. A table with 3 columns and 4 rows. The first column labeled element has entries nitrogen, hydrogen, sulfur, oxygen. The second column labeled calculation has entries 1 times 2 times 3 , 4 times 2 times 3, 1 times 4 times 3, 4 times 3. The third column labeled total atoms has entries 6, 24, 12, 12. What mistake did Elena make? She should not have multiplied the sulfur atoms by the subscript 4. She should not have multiplied the nitrogen atoms by the subscript 2. She should not have multiplied the oxygen atoms by the coefficient 3. She should not have multiplied the hydrogen atoms by the coefficient 3.
Answer:
c
Explanation:
because i got 100 on the quiz
Answer: A) She should not have multiplied the sulfur atoms by the subscript 4
Explanation: got an 100 on the quiz:)
The pH of a solution is 7.0.
What is the pOH?
Enter
Answer:
4 i think
Explanation:
How many grams of solid lithium hydroxide must be used to prepare 450
mL of 0.55M LiOH solution?
Answer:
Mass = 6.706 g
Explanation:
Given data:
Mass of lithium hydroxide = ?
Volume of lithium hydroxide = 450 mL (450/1000 = 0.450 L)
Molarity of lithium hydroxide = 0.55 M
Solution:
Formula:
Molarity = number of moles / volume in L
0.55 M = number of moles / 0.450 L
Number of moles = 0.55 M × 0.450 L
Number of moles = 0.25 mol
Mass in gram:
Mass = number of moles × molar mass
Mass = 0.25 mol × 23.95 g/mol
Mass = 6.706 g