Answer:
2.122×10^25atoms
Explanation:
number of moles=mass/molar mass
7.05moles= mass of pyridine/79
reacting mass of pyridine=556.95
C5H5N= (12×5)+(5)+(14)=79
C5=60
to find the mass of carbon in 556.95g of pyridine we take the stoichometric ratio
60[C5] -----> 79[C5H5N]
x[C5] --------> 556.95g[C5H5N]
cross multiply
x=(60×556.95)/79
x=423g of carbon
moles=mass/molar mass
moles of carbon=423/12
moles=35.25moles of carbon
moles=number of particles/Avogadro's constant
35.25=number of particles/6.02×10^23
number of particles=2.122×10^25atoms of carbon
The number of carbon atoms present in the 7.05 moles of pyridine is equal to 2.12 ×10²⁵. Therefore, option (D) is correct.
What is Avogadro's number?Avogadro’s number can be useful to express the number of particles in 1 mole of a chemical substance. Generally, these particles can be ions, atoms, molecules, electrons, or protons, according to the type of chemical reaction.
Avogadro’s constant is experimentally found approximately equal to 6.022 × 10²³ per mole.
Given, the number of moles of the Pyridine = 7.05 mol
The molar mass of the C₅H₅N = 79 g/mol
On molecule of pyridine has carbon atoms = 5
One mole of pyridine has carbon atoms = 5 × 6.022 × 10²³
Then 7.05 moles of pyridine have carbon atoms = 7.05 ×5 × 6.022 × 10²³
= 2.12 ×10²⁵ carbon atoms
Therefore, 2.12 ×10²⁵ carbons are present in 7.05 moles of pyridine.
Learn more about Avogadro's number, here:
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I need help everyone
Answer:
The answer is D
The last one
how are fossils discovered
Which of the following substance has the highest concentration of hydrogen ions in solution
A bleach
B water
C tomato juice
D vinegar
1
50.0 grams of an unknown metal is heated to 100.0°C and then placed in a calorimeter with 250.0 mL of water. If the final temperature of the
metal is 29.1°C and the calorimeter absorbed 824 Joules of energy, what
is the specific heat of the unknown metal? *
In order for photosynthesis to happen, plants need radiant energy and which of the
following reactants?
A
Glucose sugar and water
B
Oxygen and water
с
Carbon dioxide and water
D
Oxygen and glucose sugar
Answer:
the answer is c carbon dioxide and water
Chemical symbols stand for?
Answer Explanation:
If it is like H, or O or N or Na or Cl, those are the elements. Those are on the Periodic table. pH is the acidity and basicity of a substance, how acidic or basic(caustic) it is. mol is Moles. kPa is kilopascals. STP is standard temperature and pressure, at 0*C(Celsius), or 273.15 K(Kelvin), and 101,325 pascals, or 101.325 kilopascals.
Avagadro's Number is 6.022x10^23, the number of atoms in a mole. The Ideal Gas Law is P(Pressure in kPa) times V(Volume in L, liters) equals n(number of moles of gas) times R(the universal gas constant, or 8.3145 (L kPa/K mol) or 8.3145 liters kilopascals per Kelvin mole. that is just a few of them.
Plz Answer this if you Answer this right you will get brainliest
Don't Answer this question if you don't know you will be reported
Reaction 1 :-
AlZn²⁺Zn²⁺AlReaction 2 :-
LiAl³⁺Al³⁺Li________________________ are pieces of information that describe the appearance of the cell's content.
I think the answer is organelles.
please help me I have no idea what this is
name two other substances with giant covalent structures
Answer:
Diamond and graphite forms of carbon, silicon dioxide (silica)
thenks and mark me brainliestt pls :))
Answer:
Diamond and graphite forms of carbon) and silicon dioxide (silica) are examples of giant covalent structures (lattices) of atoms. All the atoms in these structures are linked to other atoms by strong covalent bonds and so they have very high melting points.
How many grams of KI would you need to prepare 0.50 g of 7.0% KI (m/m) solution?
Answer:
fomula; ( x = mutiplacation btw)
% m/m = m(solute) / m(solution) x 100%
0.50g x 70% = m/m x 100%
0.5g x 70% / 100% = 3.5 g KI
(both % cancle each other)
Explanation:
heads up might be wrong i did it myself
Which statement about noble gases is correct? *
They are extremely rare in nature.
They are highly reactive with both metals and nonmetals.
O They exist as single atoms rather than as molecules.
O They form compounds with very bright colors.
Answer:
Hello There!!
Explanation:
I believe the answer is O They form compounds with very bright colors.
hope this helps,have a great day!!
~Pinky~
The statement about noble gases that is correct is D. They form compounds with very bright colors.
Noble gases simply refers to the elements that have similar properties. Noble gases are colorless, odorless, and have very low reactivity.
Examples of noble gases are helium, argon, Krypton, xenon, etc. Noble gases also form compounds with very bright colors.
In conclusion, the correct option is D.
Read related link on:
https://brainly.com/question/24070118
Why are organisms given a universally accepted name?
classify the following energy sources as renewable and non-renewable energy sources (natural gas cool biomass and geothermal energy)
Answer:
bio mass is renewable
natural gas non renewable geothermal energy renewable
Explanation:
biomass is by palnts and animals geothermals is unlimeted because its made out of the earths core
Megan rolls a ball down a ramp until the ball hits a wall. The ramp is 2.5 m long and the distance from the end of the ramp to the wall is 1.5 m. If it took .5 sec for the ball to hit the wall then what is the ball’s speed?
Answer the following-
Solving for:
Equation (with words):
Work (with numbers):
Answer w/ units:
Answer:
Solving for: Speed
Equation (with words): S = d / t
Work (with numbers): S = 4 / 0.5
Answer w/ units: 8 m/s
Two mice have different parents. They both have the same protein for whisker thickness in their cells.
Answer:
Due to presence of similar protein.
Explanation:
The two mice are different from one another due to their different parents so in that way the physical features of both mice are different from one another. Both mice have the same protein for whisker thickness in their cells that leads to same whisker in both mice. The common feature in both mice are the protein that is responsible for whisker thickness so both have same whisker on their face.
Which of the following is a method for measuring energy in food?
A. reading the label
B. filtration
C. chromatography
D. calorimetry
Calculate the mass defect and the nuclear binding energy of nitrogen-14.
The mass of a proton is 1.00728 amu, and the mass of a neutron is 1.00866 amu.
The mass of a nitrogen-14 atom is 14.00307 amu.
The mass defect of nitrogen-14 is
amu. Round to the decimal place.
The nuclear binding energy of one nitrogen-14 atom is
x 10A J. Round to 3 significant digits.
A:
Answer:
1.62 * 10^-11 J
Explanation:
Nitrogen-14 nucleus has seven neutrons and seven protons. So;
Total mass of protons = 7(1.00728 amu)
Total mass of neutrons = 7(1.00866 amu)
Total mass of nucleons = 7(1.00728 amu) + 7(1.00866 amu)= 14.11158 amu
Mass of Nitrogen-14 nucleus = 14.00307 amu
Mass defect = 14.11158 amu - 14.00307 amu = 0.10851 amu = 1.801852171 * 10^-28 Kg
Binding energy = Δmc^2
Where;
Δm = mass defect
c = speed of light
Binding energy = 1.801852171 * 10^-28 Kg * (3 * 10^8)^2
Binding energy = 1.62 * 10^-11 J
Answer:
0.10851 amu
1.62
-11
Explanation:
Yw
A gas with a volume of 250 mL at a temperature of 293K is heated to 324K. What is the new volume of the gas?
Answer:
The new volume of the gas is 276.45 mL.
Explanation:
Charles's law indicates that for a given sum of gas at constant pressure, as the temperature increases, the volume of the gas increases, and as the temperature decreases, the volume of the gas decreases.
Charles's law is a law that mathematically says that when the amount of gas and pressure are kept constant, the quotient that exists between the volume and the temperature will always have the same value:
[tex]\frac{V}{T} =k[/tex]
Analyzing an initial state 1 and a final state 2, it is satisfied:
[tex]\frac{V1}{T1} =\frac{V2}{T2}[/tex]
In this case:
V1= 250 mLT1= 293 KV2= ?T2= 324 KReplacing:
[tex]\frac{250 mL}{293 K} =\frac{V2}{324 K}[/tex]
Solving:
[tex]V2=324 K*\frac{250 mL}{293 K}[/tex]
V2= 276.45 mL
The new volume of the gas is 276.45 mL.
Can someone pleasee help me with this asap!! Im struggling
4a. D - The last number in the configuration represents the group, in this case 3, and the number of shells represent the period, which is also 3.
4bi. Rubidium metal reacts very rapidly with water to form a colourless solution of rubidium hydroxide (RbOH) and hydrogen gas (H2). The resulting solution is basic because of the dissolved hydroxide. The reaction is very exothermic and explosive.
4bii. Lithium is smaller in size than potassium . so valence electrons are more tightly held in Li than K. Due to larger size of K the valence electrons are loosely held and easy to remove the electron from K. Hence K is more reactive.
How much total time was required to boil this substance after it reached its melting point?
Question 4 options:
a)
2 min
b)
5 min
c)
10 min
d)
15 min
Answer:
c
Explanation:
SOMEBODY PLEASE HELP ME ASAP. WILL GIVE BRAINLIEST TO BEST ANSWER.
Answer:
135.80 g of Ag
Explanation:
[tex]40gCu *\frac{1mol Cu}{63.546g Cu} *\frac{2mol Ag}{1molCu} *\frac{107.868g Ag}{1mol Ag}[/tex]
~ 135.80 g of Ag
How many grams of NaNO3 can be dissolved in 200mL of water at 40 degrees Celsius?
Group of answer choices
200 grams
210 grams
100 grams
105 grams
Answer:
I think the answer is, 100.
Explanation:
but i dont know try
How many moles are in 25.0 grams of KMnO4?
0.124 mol KMnO4
0.158 mol KMnO4
0.199 mol KMnO4
0.316 mol KMnO4
Answer:
158 mol :)
Explanation:
I have 3 questions that I will need help from you. 1. The weight of a millimeter of (NH4)2 HPO4 is? 2. How many moles of alanine, C3H7NO2 are there in 159g of alanine? And 3. Nitric acid is a very important industrial chemical. 1.612 * 10^10 pounds of it were produced in 1992. If the density of nitric acid is 12.53 pounds/gallon. What volume would be occupied by this quantity. (1 gallon =3.7854liters)
Answer:
1. m(NH₄)₂HPO₄ = 1.62 g
2. molesC₃H₇NO₂ = 1.79 moles
3. V = 4.87x10⁹ L
Explanation:
These questions are pretty easy to solve, using the correct expressions and formula.
1. To do this, we just need the density of the (NH₄)₂HPO₄. In this case, the reported density is 1.62 g/mL, therefore:
d = m/V (1)
Where:
d: density (g(mL)
m: mass of the compound (g)
V: volume of the compound (mL)
As we already have the volume, we can solve for m:
m = d * V (2)
m = 1.62 * 1
m(NH₄)₂HPO₄ = 1.62 g2. To do this, we need the atomic weights of each element that composes the alanine.
C: 12 g/mol; H: 1 g/mol; N: 14 g/mol; O: 16 g/mol
With these atomic weight, let's determine the molar mass of alanine:
MM C₃H₇NO₂ = 3(12) + 7(1) + 14 + 2(16) = 89 g/mol
Now to get the moles, we use the following expression:
moles = m/MM (3)
moles = 159 / 89
molesC₃H₇NO₂ = 1.79 moles3. We have the mass and density of the nitric acid, we just solve for Volume from expression (1) of part 1:
V = m/d (3)
V = 1.612x10¹⁰ pounds / 12.53 pounds/gallons
V = 1.287x10⁹ gallons
Converting this to liters:
V = 1.287x10⁹ * 3.7854
V = 4.87x10⁹ LHope this helps
HELP ME PLS
What is the mass of a water molecule if the hydrogens each have one neutron and the oxygen has eight neutrons?
a. 10
b. 12
c. 16
d. 20
Answer:
H2O
=(1×2)+(8)
=20
Explanation:
We have 1 Hydrogen(H) and 8 Oxygen(O)neutrons . Following the molecule formula, H2O, which means we have 2 Hydrogen that needs to times with 1 neutron;and we have only 1 Oxygen which has 8 neutrons. So 2 (H) have to times 1 and 1(O) have to times 8.
Which general formula represents the homologous series of hydrocarbons that includes the compound
2-heptyne?
(1) Cn H2n-6
(2) Cn H2n-2
(3) Cn H2n
(4) Cn H2n+2
the general formular is cnH2n-2
Explain why the atomic number is called the fingerprint of element
Answer:
No element shares the same atomic number. The atomic number of every element is unique to itself, just like a fingerprint is unique to a human. The atomic number of element allows us to identify it, like how we can identify a person from their fingerprint.
Explanation:
If 500 g of iron absorbs 184,000 J of heat, what will be the change in temperature?NEED THE ANSWER AS SOON AS POSSIBLE! :)
Answer:
Is this the full question?
Define Ductility.
_____________
Answer:
the property of metal which can be bitten in a thin wire by hitting is defined as ductility.
The ability of a material to deform itself without any fracture is known as ductility for example the plastic bag- we can deform it without breaking it- The term is ductility is used to check how ductile a material or metal is in order to give them desirable and acceptable shape!