Answer:
4.031×[tex]10^{23}[/tex]
Explanation:
You first need to calculate the number moles of NO2. To do this use PV=nRT
STP stands for standard temperature and pressure which is 0 degrees C and 1 atm.
due to that:
P = 1 atm
V = 15 L
R = 0.08206 L*atm/mol*K
T = 273 K
n = unknown moles
solve for n to make the equation n=PV/RT
n=(1atm*15L)/(0.08206 Latm/molK*273K)
n=0.6696 mol of NO2
Then to find the number of molecules we use Avogadro's number which tells us the number of molecules per mol of a molecule or atom.
Avogadro's number is 6.02x10^23 molecules/mol
number of molecules = 0.6696mol × 6.02x10^23 molecules/mol
number of molecules = 4.031×10^23 molecules of NO2
Let me know if anything is not clear or if you get something else in the comments so that we can work it out.
A sound wave moves from a solid material into a liquid. What would happen to the frequency of the sound?
how to find the electron in an atom/element
Answer:
to find the number of electrons an element has locate it on the periodic table of elements find the atomic number and note the number of protons because they are naturally electrically neutral
Answer:
M-A=N
Explanation:
M-A=N
Here is an example.
The equation above means that the atomic number (A) subtracted from the average atomic mass (M) equals the combined amount of neutrons and protons. Since we know that 35 17Cl is Chlorine (this is because Chlorine (Cl) is the 17th number on the periodic table and has the average atomic mass of 35), we can insert our data into the equation and end up with the following:
35-17=18.
From here, we can tell that we have a mix of neutrons and protons, with the total being 18. Since the atomic number is 17, we can reasonably assume that there are 17 protons and 1 neutron.
But we still need to find the number of electrons. Fortunately, the number of electrons is always equivilant to the number of protons and the atomic mass, so we know that the number of electrons is 17.
So, we have;
17 Protons
1 Neutron
17 Electrons
You have discovered an element that is a poor conductor of electricity, has a low melting point, and is a gas at room temperature. How would you classify this element?
A.metal
B.metalloid
C.actinoid
D.nonmetal
Which of the following is an intensive property?
Mass
Magnetism
Shape
Volume
Answer:
I believe its A. Mass
Explanation:
An intensive property is a property of matter that depends only on the type of matter in a sample and not on the amount. For example, the electrical conductivity of a pure substance is a property that depends only on the type of substance. Silver, gold, and copper are excellent conductors of electricity, while glass and plastic are poor conductors.. Other intensive properties include color, temperature, density, and solubility.
Answer:
B. Magnetism
Explanation:
Hope this helps! :))
Sorry for late answer
Help me please:(:(:( with my bellwork
for brainiest
Answer:
Elements are made of only one kind of atom
Compounds are made of 2 or more elements chemically bonded together
Explanation:
Its right there????
Zinc metal (Zn) reacts with hydrochloric acid (HCI) to produce hydrogen gas (H) and zinc chloride (ZnCl2). A scientist has powdered zinc and a chunk of zinc of equal mass. Available in the lab are dilute HCl and concentrated HCl. Which combination of zinc and acid would react most quickly? Explain why the combination you chose would make the reaction occur most quickly.
Answer:
hello I am interested in the position and would like to know if you have any questions please feel free to contact me at any time if
If you start with 14.0 grams of diatomic nitrogen (N2) how many grams of diatomic hydrogen (H2) will react with it?
Answer:
I just need points
Explanation:
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What is a mixture of sugar and water?
a solution
molecule
a compound
a precipitate
Explanation:
I think its a solution just me tell me in comments if right
Answer:
A solution
Explanation:
Sugar is soluble in water and would dissolve into the water to form a solution.
How many grams are in 7.5 moles of C6H12?
Group of answer choices
0.09g
630g
11.2
84g
Answer:
630gC₆H₁₂
Explanation:
How many grams are in 7.5 moles of C₆H₁₂?
C₆:12.011×6=72.066
H₁₂:1.008×12=12.096
72.066+12.096=84.162
84.162g/mol C₆H₁₂
7.5 molC₆H₁₂ ×84.162g/molC₆H₁₂= 631.215gC₆H₁₂
A nitrogen molecule (N2) has one triple bond. How many electrons do the nitrogen atoms share?
A. 1
B. 3
C. 4
D. 6
Answer:
3 electrons
Explanation:
ayo, have some points
Answer:
aha thank you :)
Explanation:
Answer:
thank you :)
Explanation:
How many molecules are equal to 3.25 moles of carbon dioxide?
Answer:
1.957 × 10²⁴ moleculesExplanation:
The number of carbon dioxide molecules can be found by using the formula
N = n × Lwhere n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
N = 3.25 × 6.02 × 10²³
We have the final answer as
1.957 × 10²⁴ moleculesHope this helps you
help with this question
DRAW A PEDIGREE
Read the following information and ON NOTEBOOK PAPER, construct a pedigree using the symbols we went over Tuesday: Scott is married to Christa. They have 3 children, Blake (a son), Peyton (a daughter), and Ashton (a daughter). Blake is married to Allie and they have 2 children, Henry (a son) and Harper (a daughter).
When you have completed your pedigree drawing, take a picture and attach it to this assignment and submit.
Answer:
Here you go
Explanation:
Are the atoms really "sharing" electrons
WILL GIVE BRAINLIEST (major help!!! need now!!!) David observed properties of four different compounds, only one of which is an ionic compound. His observations are shown in the chart.
A 2-column table with 4 rows. The first column labeled compound has entries W, X, Y, Z. The second column labeled observations has entries is a hard solid, melts at 44 degrees C, has a molecular structure; is a brittle solid, does not conduct electricity in water, has a crystal structure; is a hard solid, conducts electricity, has a molecular structure; is a brittle solid, melts at 801 degrees C, has a crystal structure.
Which is most likely the ionic compound?
W
X
Y
Z
Answer:I think it’s y sorry if I’m wrong
Explanation:
Answer:
i think it might be y
Explanation:
What does the salinity of sea water represent?
the concentration of salt dissolved in the ocean
A.the concentration of all
B. dissolved chemicals in the ocean
C. the volume of salt in the ocean
D.the mass of salt in the ocean
PLEASE GIVE ME THE RIGHT ANSWER!
Answer:
the answer is b
Explanation:
Which of the following samples of water will contain the most heat?
А-1 KL of water at 20°C
B- 1 kL of water at 70°C
C- 1 mL of water at 50°C
D- 1 mL of water at 80°C
Answer:
The answer is D- make sure you give good rate
Given a balanced chemical equation it is always possible to determine
A)
the physical state of the products and reactants
B)
whether a reaction will or will not take place
C)
the relative number of moles taking part in the reaction
D)
the conditions necessary for the reaction to take place
Answer:
C) the relative number of moles taking part in the reaction
Explanation:
From a balanced chemical equation, it is always possible to determine the relative number of moles taking part in a chemical reaction.
The number of moles is the amount of the reacting specie that makes up a chemical reaction.
In balanced chemical equation, the number of moles of reactants and products must be the same. From this understanding, we can determine the amount of reactants and products needed for a chemical reaction to take place.If you have 2.0 moles of sodium chloride (NaCl), what is its mass in grams?
Answer:
117g
Explanation:
Given parameters:
Number of moles = 2moles
Unknown:
Mass of NaCl = ?
Solution:
To solve the problem, we need to use the expression below;
Mass of NaCl = number of moles x molar mass
Molar mass of NaCl = 23 + 35.5 = 58.5g/mol
So;
Insert the parameters and solve;
Mass of NaCl = 2 x 58.5 = 117g
Susan is investigating physical changes. To do this, she places some ice into a large bowl and seals it with a lid. She leaves the bowl on the counter for several hours until all of the ice has melted. Using a balance, Susan determines that the mass of both the water and the ice are equal. Why is the mass of the ice and the water the same? (SC.8.P.9.1)
Answer:
No mass loss
Explanation:
The mass of ice and the water in the different state are equal because the same of quantity of matter is present in both state of matter of matter.
In essence, the mass of the physical change process is conserved. When mass is conserved, matter is neither created nor destroyed but can be changed from one form to the other. This is in compliance with the law of conservation of matter. So, no mass was lost in the physical change process and the mass will remain the same.How can magnetic force be exerted on objects?
1)Over a distance and anytime an object is in a magnet's field of influence.
2)Only through objects.
3)Only by touching an object.
Explain why the electron configuration of 2-3-1 represents an atom in an excited state?
Answer:
See explanation
Explanation:
If we look at the electron configuration closely, we will discover that the element must have had a ground state electron configuration of 2,4.
This is because, the innermost shell usually holds two electrons while the outer shells hold eight electrons each. The four electrons must be accommodated in the second shell in the ground state configuration of the compound.
However, when the atom is excited, one electron from this shell may move to the third shell to give the excited state configuration 2-3-1 as shown in the question.
5. Which of the following elements will have a charge of 4+ or 4- as an ion?
Answer:
The answer would either be Carbon or Silicon.
Explanation:
The chemical equation describing the burning of hydrogen gas is: 2H2 + O2 ---> 2H2O.
Why is this both a synthesis and a combustion reaction?
Answer:
"A combustion reaction is a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat. Combustion reactions must involve O2 as one reactant. The combustion of hydrogen gas produces water vapor." and "A synthesis reaction occurs when two or more reactants combine to form a single product. ... In a double replacement reaction, two compounds exchange elements. A combustion reaction occurs when a substance reacts quickly with oxygen. Combustion is commonly called burning"
Explanation:
I tried
the force that holds paticles together in the atomic nuecleaus?
Explanation:
i believe you meant particles*
A group of tourists were on an outing when they noticed that precipitation began to fall. The air temperature was 32 degree Fahrenheit. What type of precipitation did they most likely see?
Answer:
The correct answer is - rain.
Explanation:
At 32 degrees c or zero degrees Celsius, droplets of water in the atmosphere do not freeze as it is not the temperature at which water freezes but it is the temperature at which ice melts.
At this temperature the water changes its state, below 32 degrees Fahrenheit the water freezes but in the atmosphere, it not freezes necessarily and remains in the liquid state and called super-cooled liquid or water. Above this temperature, water in liquid state.
Thus, the precipitation is in the form of rain.
How much oxygen (O) is in 5.41 × 106 atoms of oxygen
Answer:
They show you how to do it sweetie
Explanation:
123456789 Common math
why is a rise in sea level significant?
Answer:
I honestly dont know but its cool problably from water fill or from the waves going to much
Explanation:
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Answer:
not sure about the first one, but i know SDS provides information about the last 3.
Explanation: