Molar mass P2O5 = 31 x 2 + 16 x 5 => 142 g/mol
142 g ---------------- 6.02 x 10²³ molecules
0.930g g ------------ ( molecules )
molecules = 0.920 x ( 6.02 x 10²³ ) / 142
molecules = 5.53 x 10²³ / 142
= 3.89 x 10²¹ molecules
1 molecule P2O5 -------------------------- 7 atoms
3.89 x 10²¹ molecules -------------------- ( atoms )
atoms = ( 3.89 x 10²¹) x 7 / 1
atoms = 2.72 x 10²² atoms of P2O5
2.72 x 10²² atoms of P₂O₅ are there in 0.930 g of P₂O₅.
Molar mass P₂O₅ = 31 x 2 + 16 x 5 => 142 g/mol
142 g atoms are present in 6.02 x 10²³ molecules
Therefore, total number of molecules in 0.930g of atoms is calculated as-
molecules = 0.930 x ( 6.02 x 10²³ ) / 142
molecules = 5.53 x 10²³ / 142
= 3.89 x 10²¹ molecules
1 molecule of P₂O₅ contains 7 atoms
Therefore, the number of atoms in 3.89 x 10²¹ molecules is calculated as
atoms = ( 3.89 x 10²¹) x 7 / 1
atoms = 2.72 x 10²² atoms of P₂O₅
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What is the correct formula for copper(ii) oxide
Answer:
CuO
Explanation:
Copper(II) oxide is a metal oxide it has the formula CuO. It has formula of copper(2+). Cupric oxide, or copper (II) oxide
2. Calculate the atomic mass of an element that has two isotopes, each with 50.00% abundance. One isotope has a mass of 63.00 amu and the other has a mass of 68.00 amu.
Answer:
The atomic mass of element is 65.5 amu.
Explanation:
Given data:
Abundance of X-63 = 50.000%
Atomic mass of X-63 = 63.00 amu
Atomic mass of X-68 = 68.00 amu
Atomic mass of element = ?
Solution:
Abundance of X-68 = 100-50 = 50%
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Average atomic mass = (50×63)+(50×68) /100
Average atomic mass = 3150 + 3400 / 100
Average atomic mass = 6550 / 100
Average atomic mass = 65.5 amu.
The atomic mass of element is 65.5 amu.
The 1995 Nobel Prize in Chemistry was shared by Paul Crutzen, F. Sherwood Rowland, and Mario Molina for their work concerning the formation and decomposition of ozone in the stratosphere. Rowland and Molina hypothesized that chlorofluorocarbons (CFCs) in the stratosphere break down upon exposure to UV radiation, producing chlorine atoms. Chlorine was previously identified as a catalyst in the breakdown of ozone into oxygen gas. Using the enthalpy of reaction for two reactions with ozone, determine the enthalpy of reaction for the reaction of chlorine with ozone.
ClO(g)+O3(g)â¶Cl(g)+2O2(g) ÎHârxn=â122.8 kJ
2O3(g)â¶3O2(g) ÎHârxn=â285.3 kJ
O3(g)+Cl(g)â¶ClO(g)+O2(g) ÎHârxn= ?
Answer:
ΔH = -162.5 kJ.
Explanation:
Hello.
In this case, we first rearrange the reactions:
ClO(g) + O₃(g) ⇒ Cl(g) + 2O₂(g); ΔH =-122.8 kJ
2O₃(g) ⇒ 3O₂(g); ΔH=-285.3 kJ
O₃(g) + Cl(g) ⇒ ClO(g) + O₂(g); ΔH= ?
Thus, we are going to use the Hess law, as an strategy to rearrange the known chemical reactions and thereby compute the enthalpy of reaction of the unknown one.
1. The first reaction must be inverted in order to obtain chlorine as a reactant in the third one, therefore, the enthalpy of reaction becomes positive:
Cl(g) + 2O₂(g) ⇒ ClO(g) + O₃(g); ΔH = 122.8 kJ
2. Second reaction remains the same:
2O₃(g) ⇒ 3O₂(g); ΔH=-285.3 kJ
Then, we add them to obtain:
Cl(g) + 2O₂(g) + 2O₃(g) ⇒ ClO(g) + O₃(g) + 3O₂(g)
Whereas we can subtract both oxygen and ozone to obtain the third one:
O₃(g) + Cl(g) ⇒ ClO(g) + O₂(g)
Therefore, the enthalpy of reaction turns out:
ΔH = 122.8 kJ + (-285.3 kJ )
ΔH = -162.5 kJ.
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name any three chemical pollutants
Answer:
Ozone (O3) Nitrogen dioxide (NO2) Carbon monoxide (CO) Sulphur dioxide (SO2)
Explanation:
Answer:
Particulate matter (PM10 and PM2. ...
Ozone (O3)
Nitrogen dioxide (NO2)
Carbon monoxide (CO)
Sulphur dioxide (SO2)
Explanation:
Particulate matter (PM10 and PM2. ...
Ozone (O3)
Nitrogen dioxide (NO2)
Carbon monoxide (CO)
Sulphur dioxide (SO2)
Identify the NMR term that corresponds to each description.
A) The end of the NMR spectrum close to the reference signal
B) The end of the NMR spectrum far from the reference signal
C) The appearance of multiple peaks for a single nucleus due to neighboring nuclei
D) The frequency at which a nucleus absorbs and resonates with a magnetic field
E) The area of a signal that corresponds to the number of nuclei at that frequency
Answer:
A- upfield
B- down field
C- splitting
D- chemical shift
E- integration
Explanation:
NMR is a spectroscopic technique commonly used to observe the magnetic fields around the nucleus of atoms in a compound under investigation.
A chemical shift is the difference in parts per million (ppm) between the resonance frequency of the observed protons in the compound under study and that of the tetramethylsilane (TMS) (the reference compound in NMR with a chemical shift of zero ppm because all protons in the compound are equivalent).
If signals appear close to the reference signal, the signals are said to appear upfield. If the signals appear far away from the reference, they are said to appear down field.
The presence of protons cause splitting of peaks to the magnitude of n+1. n is the number of neighboring protons. Splitting refers to the appearance of multiple peaks for a single nucleus due to neighboring nuclei.
The area of a signal that corresponds to the number of nuclei at that frequency is called the integration.
Bombarding plutonium-239 with an alpha particle creates an isotope of curium. Balance the equation. 239 94 Pu + 4 2 He → a b Cm + c d n Identify the values for the unknown letters. a is b is c is d is
Answer:
242
96
1
0
Explanation:
Knowing the functioning of balancing equations, we have that the values of the constants correspond to 242, 96, 1 e 0.
Given the equation we have:
[tex]239 \ 94 Pu + 4 2 He \rightarrow a b Cm + c d[/tex]
Knowing from the beginning that nothing is lost and nothing is created but everything is transformed, we will have that the value of the constants will be given by:
D: will be equal to zero because two constants together don't mean anythingC: will be equal to 1 for the same reason as D.so for a and b we will calculate as:
[tex]239+3=a\\a=242\\94+2=b\\b=96[/tex]
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You are given a sulfuric acid solution of unknown concentration. You dispense 10.00 mL of the unknown solution into an Erlenmeyer flask and add 12.2 mL of distilled water and a drop of phenopthalein to the flask. You fill your buret with 0.103 M NaOH (aq) solution and begin the titration. During the titration you rinse the tip and the sides of the Erlenmeyer flask with 3.52 mL of distilled water. It requires 10.38 mL of your NaOH (aq) solution to reach the endpoint and a very faint pink color in the flask. What is the concentration of your sulfuric acid solution in M (Remember the balanced equation for this reaction)?
Answer:
"0.053457 M" of sulfuric acid.
Explanation:
The given values are:
[tex]V[/tex] = 10 mL solution
[tex]V_{added}[/tex] = 12.20 mL
[tex]V_{total}[/tex] = 22.20 mL
then,
M 0.103 M of NaOH,
[tex]V_{rinsed}[/tex] = experiment will not be affected
[tex]V_{total \ base}[/tex] = 10.38 mL
Now,
⇒ mol of NAOH = MV
= [tex]0.103\times 10.38[/tex]
= [tex]1.06914 \ m[/tex]
Whether Sulfuric acid, then
⇒ [tex]H_{2}SO_{4} + 2NaOH = Na_{2}SO_{4} + 2H_{2}O[/tex]
⇒ [tex]mol \ of \ acid =\frac{1}{2}\times \ mol \ of \ base[/tex]
⇒ [tex]1.06914 \ m \ mol \ of \ base = \frac{1}{2}\times 1.06914 = 0.53457 \ m \ mol \ of \ acid[/tex]
Before any dilution:
[tex]V_{sample} = 10 \ mL[/tex]
⇒ [tex]M \ acid = \frac{m \ mol}{V}[/tex]
[tex]=\frac{ 0.53457 }{10}[/tex]
[tex]=0.053457 \ M[/tex] (Sulfuric acid)
nuclear equation of Rn-220 alpha decay
What is the mass number of an atom containing 7 protons and 7 neutrons?
Answer:
14
Explanation:
Neutrons are neutral and if there are no electrons to cancel out the protons you add the neutrons and protons together
6. Macromolecules represent which level of organization in the body?
cellular
tissue
o
chemical
organ
Answer:
Chemical
Explanation:
Macromolecules are part of the chemical components of cells. For example, DNA, proteins, and lipids.
Cells of similar types/function form tissues. Different types of tissues interact together to form organs. Organs form a common function.
What do hurricanes, tornadoes, and thunderstorms have in common?
Answer choices: cold temperatures
low pressure systems
storm surge
precipitation
Answer:
What do hurricanes, tornadoes, and thunderstorms have in common?
ANSWER : Low pressure systems
When air absorbs more energy and heats up, the air molecules slow down.
True
False
50 POINTS
Answer:
False
Explanation:
Draw activation energy diagrams for the following reactions labeling reactants, products,
activation energy, activated complex, and enthalpy change.
a. 4Al + 30, 2A1,O, AH=-30J/mol
b. 24,0 H2H2 + O, AH=30J/mol
Answer:
i dont no
Explanation:
i need answer please
Why is it important to always be yourself and not try to be like someone else?
Answer:
You Just Have To Be Yourself To Succeed
Your difference is a strength that you will have to learn to exploit to your advantage. Thus, you should not compare yourself to others because it is a behavior that can only slow you down in your progress. Indeed, everyone progresses at their own pace in life. Your unique and beautiful just the way you are, you don't have to change yourself because of people are judging you. You just have to be yourself!
Explanation:
What is the basis for analyzing an energy transfer diagram?
The mechanical energy input and output must be equal.
Heat must always be the largest output.
The sum of all outputs must equal the input.
Electrical energy is an input but not an output.
Answer: The sum of all outputs must equal the input:
Explanation:
A certain element has 12 neutrons and 12 protons. Assume that this atom has an
overall neutral charge.
What is the identity of this element?
What the rows of elements in the periodic table called?
A: orbitals
B: s, p, d, and f blocks
C: periods
D: groups
A sample of 8.5 g NH3 on oxidation produces 4.5 g of NO. Calculate the percent yield.
Reaction: 4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(g)
Answer:
The answer is 30%
what are sediments???????????????????????
Answer:
what are sediments???????????????????????
Explanation:
Sediment is a naturally occurring material that is broken down by processes of weathering and erosion, and is subsequently transported by the action of wind, water, or ice or by the force of gravity acting on the particles.
I hope that helped you.
Answer:
a naturally occurring material that is broken down by processes of weathering and erosion.
Explanation:
Dictionaries help with definitions such as the one I've given you. :)
How many moles of sodium sulfate will be produced from 25.6 grams of sodium hydroxide? Moles to sodium sulfate to mol
es una muy buena experiencia para poder conseguir una buena respuesta
1-isopropyl-2-methylcyclohexane identify the numbers of hydrogen atoms
Explanation:
I think 20
0 in the photo should be 1, 1, 1
In 1-isopropyl-2-methylcyclohexane, the number of hydrogen atoms is 18, and this is also an isomer of the cyclohexane, there is a methyl group on the first carbon and an isopropyl group on the second carbon in 1-isopropyl-2-methylcyclohexane.
What is the significance of 1-isopropyl-2-methylcyclohexane?It is significant as it has a methyl group and an isopropyl group, it is an isomer of the cyclohexane, and it is a compound that can exist in multiple forms with different properties, such as in the field of organic chemistry, uses in industry, etc.
Hence, in 1-isopropyl-2-methylcyclohexane, the number of hydrogen atoms is 18, and this is also an isomer of the cyclohexane, there is a methyl group on the first carbon and an isopropyl group on the second carbon in 1-isopropyl-2-methylcyclohexane.
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A 6.2-L balloon at 55˚C and 615mm Hg is taken to the top of Mt. Everest (-35˚C and 400- mmHg). What is the size of the balloon?
Explanation:
wish I could help but I'm lost
Answer: 6.788
Explanation: Water expands 9% when frozen and if the baloon is filled with all 6.2-L then its just 9% of 6.2 which is 0.588 then add it toghether unless your asking something else becuase im not smart and I can't even divided. :p
What do Px Pz and Py represent.
Answer:
Explanation:
The names Px, Py and Pz, indicate the orientation of the orbital in space. The key difference between Px Py and Pz orbitals is that Px orbital has two lobes oriented along the x-axis and Py orbital has two lobes oriented along the y-axis whereas Pz orbital has two lobes oriented along the z-axis.
Answer:
Px can stand for Picture Pixel Prescription Prognosis Post Exchange or Physical Exam Personal Exchange Price.
Pz can stand for Precautionary Zone
Py can stand for Program Year or Python
Explanation:
hope this helps
Copper reacts with silver nitrate to produce silver and
copper(ll) nitrate. In this reaction 40.7 g of silver is produced.
g
Calculate number of moles of each reactant.
Answer:
0.188 moles of copper and 0.376 moles of silver nitrate
Explanation:
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Let's see
[tex]\\ \rm\rightarrowtail Cu+AgNO_3\longrightarrow Cu(NO_3)_2+Ag[/tex]
Moles of silver :-
40.7/108=0.38mol1 mol copper produces 1 mol Ag0.38 mol Cu produces 0.38 mol Ag0.38 mol AgNO_3 produces 0.38 mol AgWhich type of stem supports trees and lives for several years?
leafy
herbaceous
woody
flowerin
Answer:
I am thinking it is woody based off of what I've seen and read.
Use the drop-down menus to indicate the stage of technological design in which each action would occur
Answer:
Explanation:
whats the thing to put 2 gether
Calculate the volume in mL of a 0.600 M NaCl solution that contains 0.00123 moles of NaCl.
The volume in of a 0.600 M NaCl solution that contains 0.00123 moles of NaCl is 2.05mL
How to calculate volume?The volume of a substance can be calculated using the following expression:
molarity = no. of moles ÷ volume
According to this question, a 0.600 M NaCl solution contains 0.00123 moles of NaCl.
volume = 0.00123 moles ÷ 0.600 M
volume = 0.00205L
Therefore, the volume in of a 0.600 M NaCl solution that contains 0.00123 moles of NaCl is 2.05mL.
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Consider the reaction 3X + 2Y 5C + 4D
How many moles of C can be synthesized from 31.0 moles of Y and excess X?
D
Answer:
This problem is providing a chemical equation between two hypothetical elements, X and Y and asks for the molesof X that are needed to
produce 21.00 moles of D in excess Y. After the following work, the answer turns out to be 15.75 mol X:Mole ratios:In chemistry, one the most crucial branches is stoichiometry, which allows us to perform calculations with grams, moles and particles (atoms, molecules and ions). It is based on the concept of mole ratios, whereby the moles of a specific substance can be converted to moles of another one, say product to reactant, reactant to reactant, reactant to product and product to product.
Calculations:In such a way, since 21.00 moles of D are given, we need the mole ratio of D to X in order to get the answer, which according to the reaction is 3:4 based on their coefficients in the reaction. Hence, we calculate the required as follows:
Explanation:
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50 POINTS
When air heats up, it will _____, cool, and then _____ back down. The creates a convection cell.
1. heat ; fall
2. condense ; fall
3. fall ; rise
4. rise ; fall
Answer:
rise the fall
Explanation:
when air is heated it become lighter then rise but when cooled it becomes heavy and fall
Uh yah I’ll give you the crown thingy! And extra points:)