Answer:1.635
⋅
10
24
Explanation: yes
There are 6.02 × 10²³ molecules in one mole or 18 g of water. Then, 10 lbs that is 4535.9 g or 251.9 moles of water contains 1.51 ×10²⁶ water molecules.
What is Avogadro number ?One mole of every substance contains 6.02 × 10²³atoms of it. This number is called Avogadro number. Hence, one mole of every element contains Avogadro number of atoms.
Similarly one mole of every compound contains Avogadro number of its molecules. The mass of one mole of a compound is called its molar mass.
The molar mass of water = 18 g
one mole or 18 g of water contains 6.02 × 10²³ molecules.
1 lbs = 453.59 g
then 10 lbs = 4535.9 g
number of moles in 4535.9 g of water =4535.9 g / 18 /mol = 251.9 mol.
Then,
number of moles in 251.9 moles = 251.9 × 6.02 × 10²³ = 1.51 ×10²⁶
Therefore, there will be 1.51 ×10²⁶ water molecules in 10 lbs of water.
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What are 2 diseases caused by coronaviruses?
An empty beaker weighs 20g and when filled with
Kensene weighs 60g. If the Volume of the kerosene is 15cm2 calculate
the density of the kerosene
Answer: The density of kerosene is [tex]2.7g/cm^3[/tex]
Explanation:
Density is defined as the mass contained per unit volume.
[tex]Density=\frac{mass}{Volume}[/tex]
Given : Mass of kerosene = mass of beaker with kerosene - mass of empty beaker = 60 g - 20 g = 40 g
Volume of kersone = [tex]15cm^3[/tex]
Putting in the values we get:
[tex]Density=\frac{40g}{15cm^3}[/tex]
[tex]Density=2.7g/cm^3[/tex]
Thus the density of kerosene is [tex]2.7g/cm^3[/tex]
A gas at 55.0°C occupies a volume of 3.60L. What volume will it occupy at 30.0° C?
Pressure is constant
Answer:
3.33L
Explanation:
a student was investigating the reaction between marble chips and dilute hydrochloric acid
Answer:
Marble chips react with dilute hydrochloric acid to produce carbon dioxide gas. The rate of this reaction can be changed by changing the size of the marble chips.
Explanation:
Hope it helps u
FOLLOW MY ACCOUNT PLS PLS
In the reaction below, 22 g of H2S with excess
O2 produced 5 g of sulfur.
? H2S + ? O2 → ? S + ? H2O .
What is the percent yield of sulfur?
Answer in units of %.
Answer:
24%
Explanation:
From the question, the limiting reactant is H2S.
The reaction equation is;
2H2S + O2 → 2S + 2H2O
Number of moles of H2S reacted = 22g/34 g/mol = 0.647 moles
According to the reaction equation;
2 moles of H2S yields 2 moles of sulphur
0.647 moles of H2S yields 0.647 moles of sulphur
So;
Theoretical yield of sulphur = 0.647 moles * 32 g/mol = 20.7 g
Actual yield = 5 g
% yield = actual yield/theoretical yield * 100
% yield =5 g/20.7 g * 100
% yield = 24%
2) A bicycle rider is traveling up a hill. When the rider reaches the top of
the hill, she stops to rest. Then she travels down the hill. The diagram
shows the rider in the three different positions. Which of these correctly
describes the potential energy and kinetic energy of the bicycle rider?
Answer: A: When the rider is at the top of the hill, her potential energy is greatest, and her kinetic energy is the least.
Explanation:
PLEASE HURRY I'M TIMED Where does the flow of energy begin in every ecosystem?
the consumers
the producers
the sun
the herbivores
Calculate the concentration of the solution produced when 5.2g of potassium chloride is
dissolved in 200cm of water.
Answer: The concentration of solution is 0.35 M
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.
[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]
where,
n = moles of solute
[tex]V_s[/tex] = volume of solution in ml = 200
moles of [tex]KCl[/tex] = [tex]\frac{\text {given mass}}{\text {Molar mass}}=\frac{5.2g}{74.5g/mol}=0.070mol[/tex]
Now put all the given values in the formula of molality, we get
[tex]Molarity=\frac{0.070\times 1000}{200}[/tex]
[tex]Molarity=0.35M[/tex]
Therefore, the concentration of solution is 0.35 M
Identify each of the following as a single bond, double bond, or triple bond.
the manager of a bookstore uses the equation s = p - 3.5 to find the price a student pays for books
ill mark brainliest
Answer:
Third one
Explanation:
In the reaction 4 Sb + 3 O2 --> Sb406, how many moles of antimony are
required to fully react with 8.00 moles of oxygen?
O 5.34 moles
O 10.7 moles
O 6.00 moles
O 12.0 moles
PLEASE HELP!!
Answer:
1.667 moles of antimony will be produced
Compounds with a ring of resonance bonds are called
Answer:
they are aromatic compounds
Explanation:
all gotten from benzene
A student prepares two solutions as shown. The dots represent solute particles. The student wants to test the conductivity of each solution. Prior to carrying out the investigation, the student needs to identify the variables being controlled and the variables being changed between the two solutions.
A.
The volume of the solution and the number of solute particles are being changed between the two solutions, but the concentration of the solution is being held constant.
B.
The number of solute particles and the concentration of the solution are being changed between the two solutions, but the volume is being held constant.
C.
The number of solute particles is being changed between the two solutions, but the volume and concentration of the solution is being held constant.
D.
The volume of the solution and the concentration of the solution are being changed between the two solutions, but the number of solute particles is being held constant.
Answer:
I think its D
Explanation:
It cant be B or C bc the solute particles arent changing. And its not A because the concentration isnt constant
The volume of the solution and the concentration of the solution are being changed between the two solutions, but the number of solute particles is being held constant.
What is conductivity?The term conductivity refers to the movement of electric current through a solution and it depends on the avilability of ions in the solution.
When measuring the conductivity of solutions, the volume of the solution and the concentration of the solution are being changed between the two solutions, but the number of solute particles is being held constant.
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Why is the solvation energy negative?
a) bonds are being created
b) bonds are breaking
Answer:
your answer will be b) bonds are breaking
_______ have cells that are all dried out.
Explanation: the answer plant seeds
not skin
1
Select the correct answer.
When melted Iron solidifles without any change in temperature, what is happening on the atomic level?
ОА.
The iron atoms are gaining kinetic energy.
ОВ.
The iron atoms are losing kinetic energy.
Ос.
The iron atoms are gaining potential energy.
OD
The iron atoms are losing potential energy.
Reset
Next
Answer:
A. the iron atoms are gaining kinetic energy
Explanation:
when the iron melted and solidifies it loses potential energy and changes to kinetic energy
Humans have altered the composition
of Earth's atmosphere by
A. Making the air pressure drop
B. Making the air temperature drop
C. Polluting it with excess ozone
D. Polluting it with carbon dioxide gas
The answer is most likely D
What is the pH and pOH of a 2.34 x 10^-5 NaOH solution?
Answer:
pOH = 4.63
pH = 9.37
Explanation:
Because NaOH is a strong base, it will completely dissociate, which means you can find pOH by taking the negative log of the concentration of hydroxide ions: pOH = -log(OH) = -log(2.34 x 10⁻⁵) = 4.630784143
To find pH use 14.00 = pH + pOH
pH = 14.00 - 4.630784143 = 9.369215857
PLEASE HELP ASAP
which is a primary consumer?
Picture shown above
zooplankton cod and krill
1. Determine los gramos obtenidos de hidróxido de calcio [Ca(OH)2], al reaccionar 12 g de óxido de calcio (CaO) con agua.
Answer:
15,86 g Ca(OH)₂ ≅ 16 g
Explanation:
La ecuación química balanceada para la reacción entre el óxido de calcio (CaO) y el agua (H₂O) para formar hidróxido de calcio (Ca(OH)₂) es la siguiente:
CaO(s) + H₂O(l) → Ca(OH)₂(ac)
De acuerdo a esta ecuación, 1 mol de Ca(OH)₂ es producida a partir de 1 mol de CaO. Convertimos las moles a gramos utilizando la masa molecular (MM) de cada compuesto:
MM(CaO)= 40 g/mol Ca + 16 g/mol O = 56 g/mol
⇒ 1 mol CaO x 56 g/mol CaO = 56 g CaO
MM(Ca(OH)₂) = 40 g/mol Ca + (2 x 16 g/mol O) + (2 x 1 g/mol H) = 74 g/mol
⇒ 1 mol Ca(OH)₂ x 74 g/mol Ca(OH)₂ = 74 g Ca(OH)₂
Por lo tanto, la relación estequiometrica es:
1 mol Ca(OH)₂/1 mol CaO = 74 g Ca(OH)₂/56 g CaO
Multiplicando la relación estequiométrica por la masa real de CaO (12 g), obtenemos los gramos obtenidos de Ca(OH)₂:
12 g CaO x 74 g Ca(OH)₂/56 g CaO = 15,86 g Ca(OH)₂
4 Catalytic converters can remove carbon monoxide.
a Give a word equation for the reaction that takes place.
b What is the purpose of the transition elements?
Answer:
a) CO+O2→CO2.
b) Copper is an ideal example of a transition metal with its variable oxidation states Cu2+ and Cu3+. The incomplete d-orbital allows the metal to facilitate exchange of electrons. Transition metals can both give and accept electrons easily, thereby making them favourable as catalysts.
Explanation:
Introduction: The (fictitious) town of Solutionville is trying to figure out a way to replace their current coal-fired power plants with cleaner and more sustainable energy sources. At a recent town meeting, it was proposed that the town build a nuclear power plant to replace coal as the community’s main source of energy for electricity.
Your Challenge: As a voting citizen of Solutionville, you must decide whether or not you support building a nuclear power plant to provide energy and electricity to homes and businesses in the community. This means carefully weighing the benefits and disadvantages of nuclear power.
1. Conduct research to learn more about nuclear power, and keep track of what you learn on slide#4 and/or in your notebook.
2. Make sure to write down the sources you get your information from, and be ready to defend the sources as credible.
3. Using the information you find, fill in the Benefits and Drawbacks Chart on slide #5 3. Be prepared to defend the information on your chart with evidence from your sources.
4. Analyze your findings, then find a partner and compare notes.
5. Decide whether or not you are in favor of or opposed to nuclear energy.
the questions involve other things that are not presented in the question, it is hard to answer this because of that sorry
Why group the microscopic molecules known to form substances
that we find in the world, such as water and salt?
Answer:
Explanation:
he gave you a virus, dont click it
.In a _____ relationship one variable increases and a second variable increases proportionally,
A. inverse relationship/inversely proportional
B. direct relationship/directly proportional
C. converse relationship/conversely proportional
Answer:
Explanation: b
Consider the reaction 2CO * O2 —> 2 CO2 what is the percent yield of carbon dioxide (MW= 44g/mol) of the reaction of 10g of carbon monoxide (MW=28g/mol) with the excess O2 produces 10g of carbon dioxide? Answer in units of %
Answer:
Y = 62.5%
Explanation:
Hello there!
In this case, for the given chemical reaction whereby carbon dioxide is produced in excess oxygen, it is firstly necessary to calculate the theoretical yield of the former throughout the reacted 10 grams of carbon monoxide:
[tex]m_{CO_2}^{theoretical}=10gCO*\frac{1molCO}{28gCO}*\frac{2molCO_2}{2molCO} *\frac{44gCO_2}{1molCO_2}\\\\ m_{CO_2}^{theoretical}=16gCO_2[/tex]
Finally, given the actual yield of the CO2-product, we can calculate the percent yield as shown below:
[tex]Y=\frac{10g}{16g} *100\%\\\\Y=62.5\%[/tex]
Best regards!
If the pressure of a gas changes, but the number of moles and volume remain constant, which
of the following values must also change?
Answer:
Pressure
Explanation:
Consider the reaction below.
HI + H2O → H30++
Which is an acid-conjugate base pair?
O HI and H20
O H2O and Hž0+
OH30+ and I
O HI and
Answer:
HI and I-
Explanation:
Hello there!
In this case, according to the acid ionization of hydroiodic acid:
[tex]HI+H_2O\rightarrow I^-+H_3O^+[/tex]
Now, since the acid, HI, results in the conjugate base, I- and the base, H2O in the conjugate acid, H3O+, it is correct to assert that the acid-conjugate base pair is HI and I-
Best regards!
The acid-conjugate base pair in the reaction above is HI and I-. Details about conjugate base can be found below.
What is a conjugate base?A conjugate base is the substance formed when an acid loses or donates its proton or hydrogen ion.
According to this question, the following reaction is given:
HI + H2O → H30+ + I-
The acid in this reaction is HI while the conjugate base is I-.
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which element's properties are similar to potassium
Are mossed and ferns climax community or pioneer species
Answer:
Pioneer species I believe.
Explanation:
What volume of H2S is needed to produce 14.2 L of SO2 gas? The balanced equation is: 2H2S + 3O2 → 2SO2 + 2H2O.
Answer:
14.2 L H2S
Explanation:
Mole ratio
2 mol H2S:2 mol SO2
We are just looking for volume, so the required amount is the same as the produced amount as long as the mole ratio is balanced.
The balanced equation is: 2H2S + 3O2 → 2SO2 + 2H2O. Mole ratio 2 mol H2S:2 mol SO2.
What is Mole ratio?Two factors can be used to identify stoichiometry problems: the information provided in the problem and he information that needs to be solved for, also known as the unknown.
The given and the unknown might both be reactants, could both be products, or could both be products with one of them acting as a reactant. Mole amounts can be used to express the substance quantities.
However, it is typical in a laboratory setting to calculate a substance's mass in grams to determine how much of it is present. A gaseous substance's volume can be used to express its quantity.
Therefore, The balanced equation is: 2H2S + 3O2 → 2SO2 + 2H2O. Mole ratio 2 mol H2S:2 mol SO2.
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