Answer: D.
Explanation: I got it right and the dude above me is spreading fake news
If the pressure exerted by a gas at 25 degrees C in a volume of 0.044 L is 3.81 atm, how
many moles of gas are present?
Answer:
0.0069 mol
Explanation:
Given data:
Temperature = 25°C
Volume of gas = 0.044 L
Pressure of gas = 3.81 atm
Number of moles of gas = ?
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
25+273 = 298 K
3.81 atm × 0.044 L = n × 0.0821 atm.L/ mol.K × 298 K
0.17 atm.L = n ×24.47 atm.L/ mol
n = 0.17 atm.L/24.47 atm.L/ mol
n = 0.0069 mol
The moles of gas has a pressure of 3.81 atm and volume 0.044 L has been 6.85 mmol.
The gas has been exhibiting the ideal nature. According to the ideal gas equation:
PV =nRT
P = pressure = 3.81 atm
V = volume = 0.044 L
R = constant = 0.0821
T = temperature = 25 [tex]\rm ^\circ C[/tex] = 298 K
Substituting the value:
3.81 [tex]\times[/tex] 0.044 = n [tex]\times[/tex] 0.0821 [tex]\times[/tex] 298
0.16764 = 24.4658 n
n = 0.00685 mol
n = 6.85 mmol
The moles of gas has a pressure of 3.81 atm and volume 0.044 L has been 6.85 mmol.
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The ΔHvap of a certain compound is 47.45 kJ·mol−1 and its ΔSvap is 59.15 J·mol−1·K−1. What is the boiling point of this compound?
Answer:
802.2 K
Explanation:
To solve this problem we can use the formula:
Tb = ΔHvap / ΔSvapWhere Tb is the boiling point (in K).
We already know the values of both ΔHvap and ΔSvap, so we calculate Tb:
ΔHvap = 47.45 kJ·mol⁻¹ = 47.45x10³J·mol⁻¹Tb = 47.45x10³J·mol⁻¹/59.15 J·mol⁻¹·K⁻¹
Tb = 802.2 KSo the boiling point of the compound is 802.2 K (or 529 °C)
The boiling point of the compound whose ΔHvap is 47.45 KJ is 802.2 K.
What is the boiling point?The temperature at which a liquid's vapor pressure matches the pressure surrounding the liquid is known as the boiling point of that substance.
By the formula of colligative property
[tex]Tb = \dfrac{\Delta Hvap}{\Delta Svap }[/tex]
Where Tb is the boiling point (in K).
ΔHvap is 47.45 kJ·mol⁻¹
ΔSvap is J·mol−1·K⁻¹
Putting the values
[tex]Tb = \dfrac{47.45}{59.15 } =802.2 K.[/tex]
Thus, the boiling point is 802.2 K or 529° C.
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Maya adds six grams of sugar to water bottle containing 14 g of warm water what is the total weight of the sugar and water
Answer:
20g
Explanation:
14g+6g=20g
Calculate the mass percent for a solution containing 85g NaCl and 155g water.
The mass percent for a solution : 35.42%
Further explanationThe concentration of a substance can be expressed in several quantities such as moles, percent (%) weight/volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.
[tex]\tt \%mass=\dfrac{mass~solute}{mass~solution}\times 100\%[/tex]
mass solute = 85 g
mass solution = 85 + 155 = 240 g
[tex]\tt \%mass=\dfrac{85}{240}\times 100\%=35.42\%[/tex]
why PbS is less soluble in water
Answer:
PbS shows a very low solubility in water, and it is insoluble in organic solvents. Any "dissolution" process in acids (hydrochloric acid, nitric acid, aqua regia) is accompanied with a chemical reaction whereby H2S is liberated and the corresponding soluble Pb2+ salts are formed. hope that helps
an experiment should be carried out in the fume cupboard if it involves
Answer:
if you are working with a substances that produce or generate toxic or harmful fumes, vapours, gases, dust or chemical aerosols
it should be carried out in a fume cupboard to eliminate or reduce the risk of exposure to an acceptable and safe level.
Calculate ΔS∘rxn for the following reaction. The ΔS∘ for each species is shown below the reaction.
C2H2(g) + 2H2(g) → C2H6(g)
S∘(J/mol⋅K) 200.9 130.7 229.2
A) -159.0 J/K
B) -233.1 J/K
C) +233.1 J/K
D) 303.3 J/K
E) 560.8 J/K
Answer:
-233.1 J/K
Explanation:
The standard entropy change for the reaction C₂H₂(g) + 2 H₂(g) → C₂H₆(g), is B) -233.1 J/K.
Let's consider the following balanced equation.
C₂H₂(g) + 2 H₂(g) → C₂H₆(g)
Entropy is a measure of how much the energy of atoms and molecules becomes more spread out in a process. We can calculate the standard entropy change for the reaction (ΔS°rxn) using the following expression.
[tex]\Delta S \°_{rxn} = \Sigma n_p \times S_p\° - \Sigma n_r \times S_r\°[/tex]
where,
n: molesS°: standard entropy of the speciesp: productsr: reactants[tex]\Delta S \°_{rxn} = 1 mol \times S\°(C_2H_6) - 1 mol \times S\°(C_2H_2) - 2 mol \times S\°(H_2)\\\Delta S \°_{rxn} = 1 mol \times (229.2J/mol.K) - 1 mol \times (200.9J/K.mol) - 2 mol \times (130.7J/K.mol) = -233.1 J/K[/tex]
The standard entropy change for the reaction C₂H₂(g) + 2 H₂(g) → C₂H₆(g), is B) -233.1 J/K.
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True or False.
E = mc2 explains why a small amount of mass can produce a great deal of energy.
Small changes in _________ protein structure may lead to big changes in _________ protein structures.
A. secondary; tertiary
B. primary; secondary
C. primary; tertiary
D. tertiary; secondary
Answer:
B. primary; secondary
Explanation:
Small changes in primary structure can result in large changes in protein shape and function. Secondary structure describes regions where the polypeptide is folded into localized shapes. There are two types of secondary structure (alpha helix and Beta pleated sheet).
Crystallization of sodium acetate occurs spontaneously from a supersaturated solution. What can you deduce about the signs of ΔS and ΔH for this process?
Answer:
ΔS < 0
ΔH < 0
Explanation:
Recall that the process is crystallization. Crystallization involves conversion of aqueous ions back to solid. This process decreases the entropy of the system hence ΔS is negative.
But remember that a process is only spontaneous when ΔG <0 (negative). From;
ΔG = ΔH - TΔS
If ΔS is negative, then (-TΔS) must be positive since ΔS is negative. The only way to make the process spontaneous is to make ΔH negative so that ΔG also becomes negative.
An element with the electron configuration: [noble gas] ns2 (n - 1)d10 np3 has how many_____________ valence electrons.
a. 2
b. 15
c. 3
d. 10
e. 5
Answer:
The correct option is e. 5
Explanation:
An element with the electron configuration [noble gas] ns² (n - 1)d¹⁰ np³ belongs to the nitrogen group element - group 15 - in a period higher than 2. The element could be As, Sb or Bi. For example, arsenic (As) has the electron configuration [Ne] 4s² 3d¹⁰ 4p³.
The valence electrons are those in the highest energy level, in a s or p sublevel. For the elements with the general electron configuration [noble gas] ns² (n - 1)d¹⁰ np³ has 5 valence electrons: 2 electrons in a s sublevel and 3 electrons in a p sublevel. The electrons in the d orbital are in a lowest energy level (n-1).
Therefore, the correct option is e. 5.
Please it’s due today at 6:00pm please help me will mark the brainiest and more points please help me
Answer:
A SUV their more dynamic if u say so (Dads a car person) But he could be wrong
when 0.20 m nh4cl (aq) and 0.20 m naoh(aq) are mixed, the reaction represented by the equation above occurs and a strong smell of ammonia, nh3 is observed. based on this information, which of the following statements is true? And Why??
Answer:
b ) NH₄⁺ is a stronger acid than H₂O ( l )
Explanation:
NH₄⁺ + OH⁻ = NH₃ + H₂O .
NH₄⁺ is a conjugate acid of NH₃
OH⁻ is a conjugate base of H₂O .
NH₄⁺ is capable of giving H⁺ to OH⁻ to produce H₂O so it is stronger acid than H₂O .
Had H₂O been stronger , it would have given H⁺ to NH₃ to produce NH₄⁺ but it does not happen .
So NH₄⁺ is a stronger acid than H₂O ( l ) .
To measure the amount of chlorine in a well-boring fluid, an analytical chemist adds silver nitrate solution to a sample of the fluid and collects the solid silver chloride product. When no more is produced, she filters, washes and weighs it, and finds that has been produced. The balanced chemical equation for the reaction is:Cl(aq) + AgNO3(ag)------- AgCl(s) + NO3- (ag) o What kind of reaction is this? a. acid-base b. redox orvcap c. precipitation
Answer:
c. precipitation
Explanation:
Let's consider the following balanced net ionic equation.
Cl⁻(aq) + AgNO₃(ag) ⇒ AgCl(s) + NO₃⁻ (ag)
What kind of reaction is this?
a. acid-base. No, because the reactants are not acids and bases.
b. redox. No, because all the species have the same oxidation numbers in the reactants and the products
c. precipitation. Yes, because an insoluble compound (AgCl) is produced, which then precipitates.
The amount of energy required to raise the temperature of 1 kilogram of a substance by 1 kelvin is called its
I hope it'll help
thanks...
How many moles of calcium chloride are needed to produce 6.50 moles of sodium chloride?
Answer:
This question appear incomplete
Explanation:
This question appear incomplete because an equation to show the production of sodium chloride from calcium chloride should have been illustrated. However, if the balanced chemical equation showing sodium chloride (NaCl) been a product of a reaction involving calcium chloride (CaCl₂) as a reactant (shown below) is to be used, then we start by writing a complete balanced chemical equation
CaCl₂ + Na₂CO₃ ⇒ CaCO₃ + 2NaCl
From the equation above, it can be deduced that 1 mole of CaCl₂ is required to produce 2 moles of NaCl, thus how many moles of CaCl₂ will be required to produce 6.5 moles of NaCl.
1 mole of CaCl₂ = 2 moles of NaCl
? moles of CaCl₂ = 6.5 moles of NaCl
cross multiply
? moles of CaCl₂ = 6.5 × 1/2
? moles of CaCl₂ = 3.25 moles of CaCl₂
3.25 moles of CaCl₂ will be needed to produce 6.5 moles of NaCl
List five acids and five bases we come across in our day to day activities under the correct heading.
acids -
citric acid- citrus fruits
lactic acid -milk
amino acids- protein
tannic acid -tea
malic acid -apple
Bases-
baking soda (Nahco3)
What was the molecular geometry for SC16?
Answer:
I'm assuming this is for the SCl₆ compound and not SC₁₆? If so, the molecular geometry is octahedral.
Explanation:
There are 6 regions and zero lone pairs surrounding the central atom (S).
What is the volume of 2.0 moles of N2?
Answer:
1.2506
Explanation:
A
is often written as an if/then statement.
O prediction
O law
O theory
O guess
What mass of precipitate can form if 1.5 L of a saturated solution of Pb(NO3)2 is mixed with 0.765 L of a 0.205 M NaI solution?
Answer:
[tex]m_{PbI_2}=36.2gPbI_2[/tex]
Explanation:
Hello!
In this case, since the chemical reaction that takes place when Pb(NO3)2 and NaI are mixed is:
[tex]Pb(NO_3)_2(aq)+2NaI(aq)\rightarrow PbI_2(s)+2NaNO_3(aq)[/tex]
By which a solid precipitate of PbI2 is produced. In such a way, since we know the volume and molarity of NaI, we can compute the moles of NaI as shown below:
[tex]n_{NaI}=0.765L*0.205\frac{molNaI}{L}=0.157molNaI[/tex]
Next, since it is in a 2:1 mole ratio with PbI2 (molar mass = 461.01 g/mol) we compute the mass of PbI2 precipitate as shown below:
[tex]m_{PbI_2}=0.157molNaI*\frac{1molPbI_2}{2molNaI}*\frac{461.01 gPbI_2}{1molPbI_2} \\\\m_{PbI_2}=36.2gPbI_2[/tex]
Best regards!
The data part of Lab Hydrates in Edgunuity
Answer:
Hydrates! :D
Explanation:
Which of the following phrases helps you to correctly remember the order of classification levels?
A) Kings cut pickles on fat green stools.
B) Kings played cards for one great second.
C) Kings play cards on fat green stools.
D) Kings cart plums for Greeks on stools.
ОООО
Answer: The correct answer would be C.
Explanation: The order of classifications are kingdom, phylum, class, order, family, genus, and species. :)
Answer B
Explanation:Which of the following phrases helps you to correctly remember the order of classifition levels?
the answer is B
In the common lead storage battery used in automobiles, the following two half-reactions occur in acid solution:
Oxidation Pb(s)+HSO−4(aq) → PbSO4(s)
Reduction PbO2(s)+HSO−4(aq) → PbSO4(s).
Write a balanced equation for the overall battery reaction.
Explanation:
Common Lead Storage Battery Used In Automobiles, The Following Two Half-reactions Occur In Acid Solution: Oxidation Pb(s)+HSO−4(aq) → PbSO4(s) Reduction PbO2(s)+HSO−4(aq) → PbSO4(s). Write A Balanced Equation For The Overall Battery Reaction.
Identify when an object has a kinetic energy of zero joules.
Question 2 options:
A. as a pendulum swings downward.
B. when the energy has been destroyed.
C. just after a ball it leaves your hand pitching a ball.
D. when an object is no longer in motion.
Answer:
D I think
Explanation:
cuz 0 j means there is nothing moving
Answer:
D. when an object is no longer in motion.
Explanation:
25 atoms W mass in grams
Answer The mass in grams for 25 atoms W is 763.10e-23.
The W is a symbol of tungsten. 25 atoms of tungsten gives 4596 mass in gram.
What are atoms?Atoms can be defined as the smallest unit into which matter can be divided without release of electrically charged particle. It is the smallest unit that form chemical elements.
Atoms are made up of electron, protons and neutrons.
To calculate mass in gram for an atom is
Mass in gram = number of atoms x atomic mass
Atomic mass of W i.e. tungsten is 183.84 u.
So mass in gram of W = 25 atoms x 183.84 u
= 4596 g
Thus, W is a symbol of tungsten. 25 atoms of tungsten gives 4596 mass in gram.
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The process of cells dividing into two identical cells is called?
Answer:
mitosis
Explanation:
Which best explains why an iceberg floats?
Water expands and becomes denser when it freezes.
Water contracts and becomes denser when it freezes.
Answer:
The options to this question are incomplete. The remaining two options are:
C. Water expands and becomes less dense when it freezes.
D. Water contracts and becomes less dense when it freezes.
The answer is C. Water expands and becomes less dense when it freezes.
Explanation:
Water is a chemical compound that exists in the three states of matter viz: solid as ICE, gas as vapour and liquid as WATER. However, due to the DENSITY properties of each state, ice floats on water. Ice is less dense than water.
When liquid water freezes, it's particles expands i.e increases in volume. Hence, it becomes less dense than water. This causes an iceberg to float on water because it has a lesser density compared to the liquid water caused by an expansion of its particles.
Answer:
answer is c
Explanation:
What is the order of reagents that were added to the test tube used to carry out the synthesis of dibenzalacetone?
Answer:
An experiment designed to synthesize dibenzlacetone would have reagents added in the following order:
Sodium hydroxide, NaOHEthanolAcetoneBenzaldehydeYellow precipitate would be re-crystallized from ethyl acetate.Explanation:
It is worth noting that the reaction is a type of mixed aldol condensation reaction, which uses sodium hydroxide as base.
I hope this is was a clear solution to the problem.
If you have a metal oxide and water in a combination reaction, what will the product be?
a
Acid
b
Molecular
с
Carbon Dioxide
d
Base
Answer:
A
Explanation: