10.8 moles are present in 6.5 × 10²⁴ atoms of Barium (Ba). Details on how to calculate number of moles can be found below.
How to calculate number of moles?The number of moles of a substance can be calculated by dividing the number of atoms in the substance by Avogadro's number.
According to this question, 6.5 × 10²⁴ atoms of Ba are present, the number of moles is calculated thus:
no of moles = 6.5 × 10²⁴ ÷ 6.02 × 10²³
no of moles = 1.08 × 10¹
no of moles = 10.8moles
Therefore, 10.8 moles are present in 6.5 × 10²⁴ atoms of Barium (Ba).
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a fossil contains c14 and n14 in the ratio of 1:3 how old is the bone
Answer:
Approximately 11460 Years Old
Explanation:
i looked this up :/
way to much maths for me
The age of the bone given that it contains C-14 and N-14 in ratio of 1:3 is 11460 years
How to determine the percentage remainingC-14 is usually used for radioactive dating (i.e to determine the aga of substance)
From the question, C-14 and N-14 exist in ratio of 1:3.
thus, the amount of C-14 remaining can be obtained as follow:
Ratio of C-14 = 1Ratio of N-14 = 3Total ratio = 1 + 3 = 4Percentage of C-14 remaining =?Percentage of C-14 remaining = 1/4 × 100
Percentage of C-14 remaining = 25%
How to determine the number of half-lives that has elapsedOriginal amount (N₀) = 100%Amount remaining (N) = 25%Number of half-lives (n) =?2ⁿ = N₀ / N
2ⁿ = 100 / 25
2ⁿ = 4
2ⁿ = 2²
n = 2
How to determine the ageHalf-life of C-14 (t½) = 5730 yearsNumber of half-lives (n) = 2Time (t) = ?t = n × t½
t = 2 × 5730
t = 11460 years
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Add distilled water to the beaker until the volume
totals 15 mL.
Record the amount of sodium chloride that
dissolved.
Ionic compounds such as sodium chloride, which dissolve in water and dissociate to form ions, are called electrolytes.
What are electrolytes?Electrolytes are substances that have a natural positive or negative electrical charge when dissolved in water.
Water molecules pull the sodium and chloride ions apart, breaking the ionic bond that held them together. After the salt compounds are pulled apart, the sodium and chloride atoms are surrounded by water molecules, as this diagram shows. Once this happens, the salt is dissolved, resulting in a homogeneous solution.
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You are trying to determine the
mass of sodium chloride required to
create a 0.875 m solution in 534 g of water. How many moles of NaCl are required?
[?] mol NaCl
The number of mole of NaCl required to prepare the solution is 0.467 mole
What is molality?The molality of a solution is simply defined as the mole of solute per kilogram of water. It is expressed mathematically as
Molality = mole / mass (Kg) of water
How to determine the mole of NaCl requiredMolality = 0.875 MMass of water = 534 g = 534 / 1000 = 0.534 KgMole of NaCl =?Molality = mole / mass (Kg) of water
0.875 = mole of NaCl / 0.534
Cross multiply
Mole of NaCl = 0.875 × 0.534
Mole of NaCl = 0.467 mole
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45.8 grams of copper requires 1172 J of heat to reach a final temperature of 100.5 ℃. What was the initial temperature? Specific heat of copper is 0.385 J/g℃.
A. 66.5[?][?][?]
B. 122[?][?][?]
C. 34.0[?][?][?]
D. 75.2[?][?][?]
I also have no idea what the [?][?][?] is. Can someone please help me for 20 points? I desperately need help. No nonsense answers either, and show the steps pls. :')
Answer:
Option A, 66.5
Explanation:
use q (heat) = m(mass) * cp(specific heat) * deltat (change in temp)
q= 1172, m = 45.8, cp = 0.385
1172= (45.8) * (0.385) * Delta T
1172= 17.633 *DeltaT
1172/17.633 =DeltaT
66.5 =DeltaT
classify the following into colloids, suspensions and true solution: soda water,chalk powder,milk,blood,ink,starch solution,sulphur powder in water,egg albumin.
Answer:
Amm is this right (if is it the right so mark me the brainliest pls)
Explanation:
Answer : Solutions- Brine, Soda water. Suspensions- Muddy river water, Chalk water mixture, Milk of magnesia, Smoke in air. Colloids- Milk, Ink, Blood, shaving cream.
A+gas+at+250k+and+15atm+has+a+molar+volume+12%+less+than+the+perfect+gas+law+character. +calculate+the+compressibility+factor
The compression factor based on the information given is 0.083.
How to calculate the compression factor?The way to calculate the compression factor goes this:
V(ideal) = RT/P
= (0.0821 × 250)/15
= 1.368
V(real) will be:
= V(ideal)/12
= 1.368/12 = 0.114
The compression factor will be:
= 1.368/(12 × 1.368)
= 0.083
Therefore, the compression factor is 0.083.
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if the temperature of this equilibrium was increased, what would happen to the equilibrium yield of chlorine?
Answer:
the temperature of the system decreases
justify the statement nuclear energy is harmful as well as useful
Which conclusion is consistent with the following net ionic equation? co2+(aq) + s2-(aq) cos(s)
The conclusion that is consistent with the ionic equation would be that COS (s) is a precipitate.
What is a precipitation reaction?It is a reaction in which 2 soluble salts in aqueous forms react to produce an insoluble salt as one of the reaction's products.
Precipitate products are usually insoluble and can be filtered off using suitable filter paper. In other words, they are solids that are suspended in solution.
Following the ionic reaction, the two reacting ions are in aqueous forms while the product formed is solid.
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How many moles of NO2 form when
63.25 g N2O5 decompose?
2N₂O54NO₂ + O₂
Answer:
1.1713 moles
Explanation:
RFM of N2O5=108
Moles of N2O5= mass/RFM= 63.25/108=0.5856 moles
Mole ratio of N2O5:NO2= 2:4
Therefore moles of NO2= 4/2*0.5856= 1.1713 moles
Escriba la formula de:
5) Ácido -3,3-dimetil-Pentinoico
6) 3-etil-6-Heptenoato de propilo
7) Bromuro de 2,3,3-trimetil--5--Hexenoilo
8) N,N-dimetil-2-metil-3-fenil-Butanamida
9) 2-etil-2,5-Octadienal
10) 2,3,3-trimetil-5-Hexinamida
Answer:
Translate your language to Englishan experiment illustrating fizzy drink production
explain the bonding nature in NaCl with diagram
Explanation:
NaCl is the compound that we want to know the Bonding structure of
in chemistry when a metal (Na) combines with a non metal (Cl) it is know as an ionic compounds
the type of bonding in ionic compounds is an ionic bond
What type of reaction is: ammonium nitrate -> dinitrogen monoxide + water?
A. Double Replacement
B. Combustion
C. Synthesis
D. Decomposition
Answer: Decomposition
Explanation:
Decomposition reactions involve a substance breaking down into simpler substances.
What volume of a 3.95 M
potassium chloride solution would
be needed to make 325 mL of a
2.76 M solution by dilution?
[?] mL of 3.95 M KCl
0.227L is the volume of a 3.95 M potassium chloride solution that would be needed to make 325 mL of a 2.76 M solution by dilution.
What are moles?A mole is defined as 6.02214076 × 10^{23} of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
Moles of KCl in new solution
0.325dm³ x (2.76mol/dm³)
= 0.897mol.
Hence volume needed
0.897mol ÷(3.95mol/dm³)
= 0.227dm³ or 0.227L.
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Look at pic and help
Answer:
Answer
Explanation:
1) Other gasses / or argon (based on what u took in ur school )
2) oxygen
3? Nitrogen
Answer:
By volume, the dry air (which i'm assuming that's what either the blue or red is) in Earth's atmosphere is about 78.09 percent nitrogen, and 0.93 percent argon (which might be what red is (if the red isn't dry air)). A brew of trace gases accounts for the other 0.03 percent (which I think that might be the yellow), including the greenhouse gases carbon dioxide, methane, nitrous oxide and ozone.
Explanation:
state and explain the trend in electronegativity values across period 3 from sodium to chlorine
The trend in electronegativity values across period 3 from sodium to chlorine is that sodium with 11 protons is the least electromagnetic element and chlorine with 17 protons is the most electronegative element.
What is electronegativity?It should be noted that electronegativity simply means a chemical property that describes the tendency of an atom to attract elements towards it.
In this case, the trend in electronegativity values across period 3 from sodium to chlorine is that sodium with 11 protons us the least electromagnetic element and chlorine with 17 protons is the most electronegative element.
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Please help, I don't know the formulas to do these and I'd like to know HOW y'all get the answers...thank you so much.
A technician produced H2 gas by reacting zinc (Zn) with sulfuric acid (H2SO4). The reaction was: 2Zn (s) + H2SO4 (aq) ----> Zn2SO4 (aq) + H2
He collected the hydrogen in a flask by water displacement. Atmospheric pressure was 737.2 torr, and room temperature was 25.0 degrees celsius.
a. What was the vapor pressure in the water flask?
b. What was the pressure of H2 in the flask?
c. Suppose that a leak in the gas collection tubes accidentally let a small amount of air into the flask. The unwanted air exerts 25.2 torr of pressure in the flask. How much pressure is the H2 exerting in the flask?
The vapour pressure in the water flask is 23.686 torr.
The pressure of [tex]H_2[/tex] in the flask was 713.514 torr.
Pressure is the [tex]H_2[/tex] exerting in the flask is 688.314 torr
What is vapour pressure?Vapour pressure is a measure of the tendency of a material to change into the gaseous or vapour state, and it increases with temperature.
a.The vapour pressure of water is given by:
[tex]Log_{10} P =A- \frac{B}{C+T}[/tex], where T is in degree Celcius, P is in torr.
For 0-100 degree celcius, A=8.07131, B=1730.63, C=233.426
[tex]Log_{10} P = 8.07131 - \frac{1730.63}{233.426+25} =1.3745[/tex]
As T =25 degree celcius
[tex]P = 10^{1.3745} torr[/tex] =23.686 torr
b.We know that [tex]P_{total} =P_{H_2} + P_{H_2O}[/tex]
[tex]P_{total}[/tex] = Atmospheric pressure
[tex]737.2 torr = P_{H_2} +23.686 torr[/tex]
[tex]P_{H_2} = 713.514 torr[/tex]
c.After there is a leak in the gas collection tube, the amount at pressure due to water vapour remains unchanged as it is a quantity dependent on temperature.
[tex]P_{total} =P_{H_2} + P_{H_2O} + P_{leaking \;air}[/tex]
[tex]737.2 torr = P_{H_2} + 23.686 torr + 25.2 torr[/tex]
[tex]P_{H_2} =688.314 torr[/tex]
For calculating molar mass of any gas:
M= Density X (RT ÷ P)
M= 0.714 g X ([tex]8.314 J mol^{-1}K^{-1}[/tex]273 K ÷ 101325 Pa)
M= 15.994 g/mol = 16 g/mol.
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neutral grain spirit is essentially the same as
The neutral grain spirit is essentially known as rectified spirits or ethyl alcohol.
Meaning of neutral grain spiritneutral grain spirit can be defined as raw material that is very concentrated with alcohol used to produce strong alcoholic products.
neutral grain spirit as the name implies is neutral in nature that is it can be blended with any other alcoholic product.
In conclusion, The neutral grain spirit is essentially known as rectified spirits or ethyl alcohol.
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A 13.00 g sample of citric acid reacts with an excess of baking soda as shown in the equation.
H3C6H507 +3NaHCO3 →3CO2 + 3H₂O+Na3C6H507
What is the theoretical yield of carbon dioxide?
0.993 g
O2.98 g
O 3.65 g
8.93 g
Answer:
eheheehehehszndn!jejxxnndrrjrrrfufurururufjththjrjrjdjjjrj\u\ujrjeejrjjjj carbon
1. How does the Key change for a weak acid?
2. How would the images change for a weak acid solution of the same concentration? Draw the images and/or
describe with words.
3. Draw the images and/or describe with words a weak acid and a strong acid solution of the greater
concentration? Make any notes that might help you remember.
4. Write the chemical reactions for a weak acid and a strong acid.
5. Is there one type of representation that might be the best one for you to remember information about weak
and strong acids?
6. Make any notes that might help you remember how to compare/contrast the two types.
The weak acid will have fewer ions than the strong acid of similar concentration.
The chemical reactions for a weak acid and a strong acid is given below:
Strong acid: HA → H⁺ + A⁻Weak acid: HA ⇆ H⁺ + A⁻What are strong and weak acids?Strong acids are acids which dissociate completely in solutions. Examples of strong acids are hydrochloric acid and sulfuric acid.
Weak acids are acids which dissociate only partially in solutions. Examples of weak acids are carbonic acid and acetic acid.
Weak acids of a similar concentration to a strong acid have fewer hydrogen ions.
The equation of the dissociation of strong acids and weak acids are given below:
Strong acid: HA → H⁺ + A⁻Weak acid: HA ⇆ H⁺ + A⁻In conclusion, weak acids produce few ions in solution while strong acids fully dissociate into ions in solution.
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This map shows the ages of the Atlantic´s oceanic crust. Which statement is supported by the information on the map?
It is evident from the provided map that the African Ocean is enlarging at a divergent plate boundary. So, the correct option is B.
What is Divergent plate boundary?When two tectonic plates diverge from one another, the area is known as a diverging plate border. New crust forms on the plate margins when the plates divide and magma rises from the mantle to fill the space. The creation of mid-ocean ridges is a result of this process, known as seafloor spreading.
Divergent plate borders can also occur on land, and they can eventually result in the formation of new ocean basins by forming rift valleys. The spreading of the seabed is aided by the divergent limits in the middle of the ocean. A fracture occurs on the ocean floor as plates made of oceanic crust move apart from one another.
Therefore, the correct option is B.
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Your question is incomplete, most probably the complete question is:
This map shows the age of the Atlantic’s oceanic crust. Which statement is supported by the information in the map?
A. The African continental plates are undergoing continental drift.
B. The African Ocean is growing wider at a divergent plate boundary.
C. The seafloor is shrinking along a convergent plate boundary.
D. The seafloor is undergoing subduction under the North America plate.
How many sublevels inn the second energy level?
There are two subshells that are s and p, which are present in the second energy level.
The energy level can be defined as the fixed distances from the nucleus of an atom where electrons may be found. Each energy level is divided into some Subshells. These subshells are known as s-subshell, p-subshell, d-subshell, and f-subshell. This subshell contains some orbitals, these orbitals are the place where there is the maximum probability of getting the electrons. In one orbital, a maximum of two electrons can be present.
Hence, there are two subshells in the second energy level.
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Help pls!!
The table compares the number of electrons in two unknown neutral atoms.
Comparison of Electrons
Atom Number of Electrons
A 10
D 11
Use this information to determine the number of valence electrons in the atoms. Which of the following correctly compares the stability of the two atoms?
A Both are unreactive.
B Both are highly reactive.
C A is unreactive and D is reactive.
D A is reactive and D is unreactive.
Answer: A is unreactive and D is reactive.
Explanation:
A is neon, which is a noble gas, and thus unreactive.
D is sodium, which is an alkali metal, and thus highly reactive.
Q2. Name, constituent of petroleum (Petrochemicals) which is used for following purposes.
(i) To make candles.
(ii) A solvent for dry cleaning
(iii) For surfacing roads.
(iii) Jet engine fuel.
(v) For lubrication.
The constituents of petroleum that are used for the following purposes are as follows:
To make candles ----- Paraffin waxA solvent for dry cleaning ----- PetrolFor surfacing roads ----- BitumenJet engine fuel ----- KeroseneFor lubrication ----- Lubricating oil.What are the constituents of petroleum?The constituents of petroleum are LPG, bitumen, paraffin wax, lubricating oil, kerosene, diesel, etc. These compounds are a mixture of hydrocarbons.
Therefore, each constituent of petroleum that is used for the following purposes is mentioned above with proper names.
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Reduction of 9-fluorenone: objective of this lab was to reduce 9-fluorenone (a ketone), to 9-fluorenol (an alcohol) using sodium borohydride as the reducing agent. experimental data: 9-fluorenone: mw 180.20 g/mol mass used 0.6 grams methanol: mw 32.04 g/mol volume used: 6ml density: 0.792 nabh4: mw 37.83 g/mol mass used 0.05 grams 9-fluorenol: mw 182.22 g/mol balanced equation for the reaction is: 4c13h8o nabh4 4ch3oh --> 4c13h10o nab(och3)4 calculate the potential yield (in grams) of 9-fluorenol for 9-fluorenone, methanol and nabh4. from these potential yields identify the limiting reagent and theoretical yield.
9-fluorenone is a limiting reagent and theoretical yield.
What is 9-fluorenol?Fluoren-9-ol is a member of the class of hydroxyfluorenes that is 9H-fluorene substituted by a hydroxy group at position 9.
Inspect stoichiometry of the given reaction as per the balanced equation below:
[tex]4C_{13}H_8O + NaBH_4 + 4CH_3 OH[/tex] → [tex]4C _{13} H _{10} O + NaB(OCH_3 )_4[/tex]
Given weight:
0.6 grams methanol
0.05 grams 9-fluorenol
0.792 [tex]NaBH_4[/tex]
Out of the three reactants, [tex]NaBH_4[/tex] acts as a reducing agent only and hence the reaction can occur only when [tex]NaBH_4[/tex] is present in relatively much smaller amounts. But the yield of the product,9-fluorenol, is not governed by its quantity.
Theoretically, when equimolar amounts of reactants ( 9-fluorenone and methanol ) are taken for reaction in presence of [tex]NaBH_4[/tex] an equivalent quantity of product, 9- fluorine is obtained, as inspected in the above stoichiometric relations. But practically we have used a lesser number of moles of 9-fluorenone than theoretically needed, hence in this case it should serve as the limiting reagent.
9- fluorenone, methanol & [tex]NaBH_4[/tex] are the reactants, while the product 9-fluorenol would be obtained = 0.0033 moles
This would represent the theoretical yield of the product 9-fluorenone, as we have used an excess of methanol thus facilitating the reaction to go to completion.
Hence, 9-fluorenone is a limiting reagent.
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the mr-vp tests are part of a battery of tests called imvic tests. these tests are useful in identifying and differentiating:
the mr-vp tests are part of a battery of tests called imvic tests. these tests are useful in identifying and differentiating Gram-positive cocci.
What is mr-vp tests?mr-vp tests can be regarded as a test that is used in the determination of fermentation pathway that is required in glucose.
It is used in mixed acid fermentation pathway and can be used in identifying and differentiating Gram-positive cocci.
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What temperature is absolute zero?
OA. 0°C
OB. OK
O
C. 0°F
D. O molecules
Answer: 0 K
Explanation:
This is a fact - absolute zero is defined as 0 degrees Kelvin.
What is surface tension? Describe how surface tension in water is useful for plants and animals.
This is not multiple choice, I need help please :')
It is a tension created by the attraction of molecules to the surface by the molecules in a bulk of a solution.
The attraction force present between water molecules is cohesion force.
The phenomenon of surface tension provides two major characteristics to the water:
It makes the surface molecules to be held together Responsible for formation of water dropletPlants take water from soil using it's roots , and water is travelling through the xylene tissues present in a plant , so the cohesion forces present in water helps it to travel to the higher places in plants.
While in case of animals, this attraction forces increases the surface density which helps to insects to walk on to the water surface.
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explain why nickel is a good conductor of heat
Answer:
Its a good conductor because its a metal
Answer:
periodic table
Explanation:
in its magnetic properties and chemical activity it resembles iron and cobalt