Answer:
pH = 8.34
Explanation:
Formic acid reacts with a strong base producing formate ion, HCOO⁻, the equilibrium is:
Kb = [HCOOH] [OH⁻] / [HCOO⁻]
Where Kb is basic equilibrium constant = Kw / Ka = 1x10⁻¹⁴ / 1.8x10⁻⁴ = 5.56x10⁻¹¹
[HCOOH] and [OH⁻] comes both from formate ion, that means [OH⁻] = [HCOOH] = X, our incognite
And [HCOO⁻] is molarity of the solution. We need to determine this:
Moles of formate = Moles of NaOH added until equivalence point:
29.80mL = 0.02980L * (0.1567mol / L) = 4.670x10⁻³ moles NaOH = Moles Formate
And total volume of the solution is:
29.80mL + 25mL = 54.8mL = 0.0548L. Molarity is:
4.670x10⁻³ moles / 0.0548L = 0.08522M
Replacing in Kb expression:
Kb = [HCOOH] [OH⁻] / [HCOO⁻]
5.56x10⁻¹¹ = [X] [X] / [0.08522M]
4.738x10⁻¹² = X²
X = [OH⁻] = 2.177x10⁻⁶M
pOH = -log [OH⁻] = 5.66
And pH = 14 - pOH is:
pH = 8.34How much work (in J) is required to expand the volume of a pump from 0.0 L to 2.2 L against an external pressure of 1.2 atm
Answer:
267.498 J is required to expand the volume of a pump from 0.0 L to 2.2 L against an external pressure of 1.2 atm
Explanation:
The volume change work of a gas is the work necessary for the gas to go from an initial volume Vi to a final volume Vf. If the volume decreases, the gas will have been compressed and it is a compression work; whereas if the volume increases, the gas will have expanded and it is expansion work.
The work is calculated by:
W= - P*ΔV= -P*(Vfinal - Vinitial)
In this case:
W= ?P= 1.2 atm= 121590 [tex]\frac{N}{m^{2} }[/tex] (being 1 atm= 101325[tex]\frac{N}{m^{2} }[/tex] )ΔV= Vfinal - Vinitial= 2.2 L - 0 L= 2.2 L= 0.0022 m³ (being 1 L=0.001 m³)Replacing:
W= -121590 [tex]\frac{N}{m^{2} }[/tex]*0.0022 m³= - 267.498 N*m= -267.498 J
267.498 J is required to expand the volume of a pump from 0.0 L to 2.2 L against an external pressure of 1.2 atm
The work require to expand the volume of the given pump is 267.5 J.
The given parameters;
initial volume of the gas, V₁ 0.0 Lfinal volume of the gas, V₂ = 2.2 Lexternal pressure, P = 1.2 atmThe work require to expand the volume of the given pump is calculated as follows;
W = PΔV
W = 1.2 atm (2.2 L - 0 L)
W = 2.64 atm.L
[tex]W = 2.64 \ atm.L \times \frac{101325 \ Pa}{1 \ atm} \times \frac{0.001 \ m^3}{1 \ L} \\\\W = 267.5 \ J[/tex]
Thus, the work require to expand the volume of the given pump is 267.5 J.
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Compare the planets Earth and Neptune. Describe how are they different from each other.
the planets Earth and Neptune
Answer:
Neptune is 34 times bigger than Earth.
Earth has life, Neptune does not.
Neptune is a gas planet, Earth is not.
Neptune has rings, Earth does not.
Neptune has 13 moons, Earth has 1.
Explanation:
The planets Earth and Neptune are different from each other as Neptune is 34 times bigger than Earth.Earth has life, Neptune does not.Neptune is a gas planet, Earth is not.Neptune has rings, Earth does not.
What is a planet?A planet is a large, rounded astronomical body that is neither a star nor its remnant. The best available theory of planet formation is the nebular hypothesis, which posits that an interstellar cloud collapses out of a nebula to create a young protostar orbited by a protoplanetary disk.
Planets grow in this disk by the gradual accumulation of material driven by gravity, a process called accretion. The Solar System has at least eight planets: the terrestrial planets Mercury, Venus, Earth and Mars, and the giant planets Jupiter, Saturn, Uranus and Neptune.
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What is the answer for this if you have the answer pls let me know 2Hg 9SCN)2 ⇀ 2HgS +CS2 + C3N4 this is for science
Answer:
1011010101010100101010101101010101010010101010110101010101001010101011010101010100101010101101010101010010101010110101010101001010101011010101010100101010101101010101010010101010110101010101001010101011010101010100101010101101010101010010101010110101010101001010101011010101010100101010101101010101010010101010110101010101001010101011010101010100101010101101010101010010101010110101010101001010101011010101010100101010101101010101010010101010110101010101001010101011010101010100101010101101010101010010101010110101010101001010101011010101010100101010101101010101010010101010110101010101001010101011010101010100101010, You're welcome
Explanation:
chemistry question please help
Answer:
It was deflected by a magnet charged particles
Which of the folio rock formation processes in NOT matched correctly?
A) Melting & cooling = Ingenious rock formation
B) Heat & pressure = metamorphic rock formation
C) Magma cooling = metamorphic rock formation
D) sediments being deposited, compacted & cemented together = sedimentary rock formation
E) Weathering, erosion, deposition, compaction & cementation = sedimentary rock formation
Answer:
I got e but you might want to wait for someone else to answer it just incase...
Answer:
Magma cooling = metamorphic rock formation
Explanation:
Did you mean formation not folio?
which reactant gets completely used up if 22.22 grams of fluorine gas reacts with 22.22 grams of chromium iii
Answer:
Chromium (III) bromide.
Explanation:
Hello.
In this case, for the reaction:
[tex]3F_2+2CrBr_3\rightarrow 3Br_2+2CrF_3[/tex]
Since there is a 3:2 mole ratio between fluorine (molar mass = 38.0 g/mol) and chromium (III) bromide (molar mass = 291.7 g/mol) we can compute the available moles of fluorine and the moles of fluorine consumed by 22.22 g chromium (III) bromide in order to realize whether it is the limiting reactant or not:
[tex]n_{F_2}^{available}=22.22gF_2*\frac{1molF_2}{38.0gF_2}=0.585molF_2\\ \\n_{F_2}^{consumed}=22.22gCrBr_3*\frac{1molCrBr_3}{291.7gCrBr_3}*\frac{3molF_2}{2molCrBr_3} =0.114molF_2[/tex]
In such a way, since just 0.114 off 0.585 moles of fluorine are consumed, we conclude it is in excess and the chromium (III) bromide is the limiting reactant, it means it gets completely used up.
Best regards!
A mixture of 14.0 grams of hydrogen, 84.0 grams of nitrogen, and 2.0 moles of oxygen are placed in a flask. When the partial pressure of the oxygen is 78.00 mm of mercury, what is the total pressure in the flask?
Total pressure in the flask : 468 mmHg
Further explanationDalton's law of partial pressures states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases
Can be formulated:
P tot = P1 + P2 + P3 ....
The partial pressure is the pressure of each gas in a mixture
For partial gas :
Pgas₁=x₁.P tot
x₁ = mole fraction of gas 1
mol of each gas :
H₂ = 14 g : 2 g/mol= 7 moles
N₂ = 84 g : 28 g/mol = 3 moles
O₂ = 2 moles
Total moles = 7+3+2= 12 moles
Partial pressure of O₂ :
[tex]\tt P_{O_2}=x_{0_2}\times P_{tot}\\\\78~mmHg=\dfrac{2}{12}\times P_{tot}\\\\P_{tot}=\dfrac{78\times 12}{2}=468~mmHg[/tex]
The study of chemicals is called chemistry.
The correct answer is 468mmhg.
Dalton's law defined as partial pressures states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases
The formula is stated as follows:-
[tex]P_{total} = P_1 + P_2 + P_3...[/tex]
The partial pressure is the pressure of each gas in a mixture. For partial gas is as follows :
[tex]P_{gas}_1=X_1.P_{total}[/tex]
The [tex]X_1[/tex] defined as a mole fraction of gas 1
The mole of each gas is as follows:-
[tex]H_2 = \frac{14}{2}= 7 molesN_2 = \frac{84}{28} = 3 molesO-_2 = 2 moles[/tex]
Total moles = [tex]7+3+2= 12 moles[/tex]
The partial pressure [tex]O_2[/tex] is as follows:-
[tex]P_{total} = \frac{78*12}{2} =468mm[/tex].
Hence, the correct answer is 468mmhg.
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Discuss each of the following observations: (a) The [CoCl4]2– ion is a regular tetrahedron but [CuCl4]2– has a flattened tetrahedral structure. (b) The electronic absorption spectrum of [CoF6]3– contains two bands with maxima at 11,500 and 14,500 cm–1.
Answer:
See explanation
Explanation:
a) Look at the electronic configuration of both species;
Cu^2+- [Ar] 3d9 4s0
Co^2+- [Ar] 3d7 4s0
We can now see that a Jahn Teller effect occurs in [CuCl4]2– due to its d9 configuration. This Jahn-Teller distortion causes the symmetry of [CuCl4]2– to change from tetrahedral T
d to trigonal pyramidal C3v.
b) This is a consequence of Jahn-Teller effect in [CoF6]3– which makes the Co-F bonds lie along the z-axis and become elongated in comparison to the remaining four Co-F bonds
Which technology is used to measure the mass of atoms and to determine the percent composition of compounds?
Answer:
Find the molar mass of all the elements in the compound in grams per mole.
Find the molecular mass of the entire compound.
Divide the component's molar mass by the entire molecular mass.
You will now have a number between 0 and 1. Multiply it by 100% to get percent composition.
Explanation:
Mass spectrometry is used to measure the mass of atoms and to determine the percent composition of compounds.
What is mass spectrometry ?There have been qualitative and numerical implications for mass spectroscopy. These include distinguishing unrecognized compounds, determining out a molecule's elemental isotopic makeup, and figuring out a compound's structure by analyzing at how it fragmented.
In order to determine the mass-to-charge ratio (m/z) of one or more molecules present in a sample, mass spectrometry is a proven to be a valuable instrument. The precise molecular weight of the sample's individual components may typically be estimated using these measures and also.
Thus, mass spectrometry is used to measure the mass of atoms and to determine the percent composition of compounds.
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The molecular mass of propanoic acid is 74.1 amu . Calculate the molecular mass of methyl ethanoate, an isomer of propanoic acid.
Answer:
74.1 amu
Explanation:
Given that,
The molecular mass of propanoic acid is 74.1 amu.
One of the isomer of propanoic acid is methyl ethanoate.
We know that, isomers are have same molecular formula. They also have same mass.
In this case, it is very clear that the molecular mass of methyl ethanoate is as same as molecular mass of propanoic acid i.e. 74.1 amu
calculate the freezing point of a solution of 30 g methyl salicylate c7h6o2 dissolved in 800 g of benzene
Answer: The freezing point of the solution will be [tex]4.3^0C[/tex]
Explanation:
Depression in freezing point is given by:
[tex]\Delta T_f=i\times K_f\times m[/tex]
[tex]\Delta T_f=T_f^0-T_f=(5.5-T_f)^0C[/tex] = Depression in freezing point
i= vant hoff factor = 1 (for non electrolyte)
[tex]K_f[/tex] = freezing point constant = [tex]4.90^0C/m[/tex]
m= molality
[tex]\Delta T_f=i\times K_f\times \frac{\text{mass of solute}}{\text{molar mass of solute}\times \text{weight of solvent in kg}}[/tex]
Weight of solvent (benzene)= 800 g = 0.8 kg
Molar mass of solute ( methyl salicylate) = 152.1 g/mol
Mass of solute ( methyl salicylate) = 30 g
[tex](5.5-T_f)^0=1\times 4.90^0C/m\times \frac{30g}{152.1 g/mol\times 0.8kg}[/tex]
[tex](5.5-T_f)0C=1.2[/tex]
[tex]T_f=4.3^0[/tex]
The freezing point of the solution will be [tex]4.3^0C[/tex]
Pillow lava forms:
underwater
on land
on mountain tops
A chemist makes up a solution by dissolving 39.0 g of Mg(NO3)2 in enough water to produce a final solution volume of 257 mL. To calculate the molarity of the solution, what additional information is needed
Answer:
[tex]M=1.02M[/tex]
Explanation:
Hello.
In this case, since the molarity of a solution is computed as the moles of solute over volume of solution:
[tex]M=\frac{n_{solute}}{V}[/tex]
Since the volume of the solution is 257 mL or also 0.257 L, we compute the moles of solute, which is magnesium nitrate (molar mass = 148.3 g/mol), as shown below:
[tex]n_{solute}=39.0gMg(NO_3)_2*\frac{1molMg(NO_3)_2}{148.3 gMg(NO_3)_2}=0.263molMg(NO_3)_2[/tex]
Thus, the required molarity turns out:
[tex]M=\frac{0.263molMg(NO_3)_2 }{0.257L}\\ \\M=1.02M[/tex]
Best regards.
What's the structure of CI2O? Is it polar or non-polar? hellp
Answer:
its polar
Explanation:
Question The end point in a titration of a 16 ml sample of aqueous HCl was reached by addition of 21.89 ml of 0.32 M titrant. The titration reaction is HCI + KOH → KCl + H2O What is the molar concentration of HCl?
Answer:
0.44 M
Explanation:
Somebody please help me I’m completely lost
Answer:
λ [Wavelength] = 3.04357825 m [meters]
Explanation:
Given a frequency, to find the wavelength, divide the speed of light by the frequency. Wavelength = Speed Of Light In Seconds / Frequency .
Wavelength in meters is: λ = 299,792,458 m/s / f Hz .
Then substitute in the frequency to find the wavelength: λ = 299,792,458 m/s / f Hz → λ = 299,792,458 m/s / 9.85 × 10^7 Hz → λ = 2.99792458 × 10^8 m/s / 9.85 × 10^7 → λ = 2.99792458 × 10^8 m / 9.85 × 10^7 → λ = 29.9792458 / 9.85 m → λ = 3.04357825 m
Which of these molecules is polar?
A. O₂
B. N2
C. BH3
D. NO
Explanation:
Then there is no net charge separation. a BH3 b CHCl3 c C2H2 d NH3. Optionally the ... Oxygen O2 c. ... BH3 2. Com Bh3 Polar Or Nonpolar In the case of non polar molecules dispersion forces or London forces are present between them.
The polar molecules is NO.
What is polar molecule?A polar molecule is one that has one end that is slightly positive and the other end that is slightly negative. Ionic or polar covalent bonds can form in polar molecule. A dipole is a molecule that has two poles. The dipole moment is the outcome of measuring the amount of polarity in a molecule.
NO molecule, In the periodic table, nitrogen is to the right of oxygen. Nitrogen has a lower electronegative potential than oxygen. All N-O bonds are polar, with the oxygen atom having a higher electron density. The uneven distribution of electrons in the NO molecule is quite minor. When a molecule is non-polar, the electrons are shared evenly, resulting in a non-polar bond, or the polar bonds are symmetric. So, oxygen, nitrogen and boron trihydride molecules are non-polar molecule.
Hence the correct option is D.
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What is the percent m/m concentration of an aqueous solution of sodium nitrate in which there are 24.34 grams of solute in 138.87 grams of solvent
Answer:
14.9%m/m
Explanation:
The percent m/m concentration of a solution (%m/m) indicates the grams of solute there are in 100 g of solution. It can be calculated as follows:
[tex]%m/m= \frac{mass of solute (g)}{mass of solution(g)} x 100[/tex]%m/m= mass of solute(g)/mass of solution(g) x 100
As the solution is composed by solute + solvent, the mathematical expression can be transformed in:
[tex]%m/m= \frac{mass of solute (g)}{mass of solution(g)} x 100[/tex]%m/m= mass of solute(g)/(mass of solute + mass of solvent (g) )x 100
= 24.34 g[tex]%m/m= \frac{mass of solute (g)}{mass of solution(g)} x 100[/tex]/(24.34 g + 138.87 g) x 100
= 24.34 g/(163.21 g) x 100
= 14.9%
[tex]%m/m= \frac{mass of solute (g)}{mass of solution} x 100 = \frac{mass of solute (g)}{mass of solute (g) + mass of solvent (g)}[/tex]
This curved shape is called the meniscus. Always read the volume at the bottom of the meniscus,
3. What is the volume of the water in the graduated cylinder?
PLS HELP ME ITS DO IN THIRTY MINUTES
Answer:
rip you
Explanation:
Of the three states of matter, molecules are moving the fastest and are the farthest apart in a what?
Answer:
Molecules are moving the fastest and are the farthest apart in the gaseous phase.
Explanation:
At what temperature will 5.00 g of F2, exert a pressure of 119.96 kPa at a volume of 750.0 mL?
Answer:
-183.15 °C
Explanation:
Given data:
Mass of F₂ = 5.00 g
Pressure = 119.96 KPa (119.96/101 = 1.2 atm)
Volume = 750.0 mL ( 750.0/1000 = 0.75L)
Temperature = ?
Solution:
First of all we will calculate the number of moles.
Number of moles = mass/molar mass
Number of moles = 5.00 g/ 38g/mol
Number of moles = 0.13 mol
Now we will calculate the temperature:
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
1.2 atm × 0.75 L = 0.13 mol ×0.0821 atm.L/ mol.K × T
0.9 atm.L = 0.01 atm.L/ K × T
T = 0.9 atm.L /0.01 atm.L/ K
T = 90 K
Kelvin to degree celsius:
90K -273.15 = -183.15 °C
Calculate the mass of water that can be vaporized with 1250 calories of energy.
Answer:
2.31 g
Explanation:
Step 1: Given data
Energy added to vaporize the water (Q): 1250 calStandard enthalpy of vaporization of water (ΔH°vap): 540 cal/gMass of water (m): ?Step 2: Calculate the mass of water that can be vaporized with 1250 calories of energy
We will use the following expression.
Q = ΔH°vap × m
m = Q/ΔH°vap
m = 1250 cal/(540 cal/g)
m = 2.31 g
which substance is translucent
Answer:
Paper, some plastics, frosted glass, etc.
Explanation:
is vinegar positive or negative charged
Answer:
Positive charged
Explanation:
Ammonia ( NH3, MM 17.031 g/mol) and hypobromite ( OBr−) react according to the following chemical reaction. 2NH3+3OBr−⟶N2+3Br−+3H2O Suppose 0.325 g of ammonia reacts with 14.5 mL of a hypobromite solution. Calculate the concentration of the hypobromite solution.
Answer:
1.98 M
Explanation:
Step 1: Write the balanced reaction
2 NH₃ + 3 BrO⁻⟶ N₂ + 3 Br⁻ + 3 H₂O
Step 2: Calculate the moles corresponding to 0.325 g of ammonia
The molar mass of NH₃ is 17.03 g/mol.
0.325 g × (1 mol/17.03 g) = 0.0191 mol
Step 3: Calculate the reacting moles of hypobromite
The molar ratio of NH₃ to BrO⁻ is 2:3. The reacting moles of hypobromite are 3/2 × 0.0191 mol = 0.0287 mol
Step 3: Calculate the molar concentration of the hypobromite solution
M = 0.0287 mol / 0.0145 L = 1.98 M
The concentration of the hypobromite solution (BrO⁻) needed for the reaction is 1.97 M
We'll begin by calculating the number of mole in 0.325 g of NH₃. This can be obtained as follow:
Mass of NH₃ = 0.325 g
Molar mass of NH₃ = 17.031 g/mol
Mole of NH₃ =?Mole = mass / molar mass
Mole of NH₃ = 0.325 / 17.031
Mole of NH₃ = 0.01908 moleNext, we shall determine the number of mole of BrO⁻ needed to react with 0.01908 mole of NH₃. This can be obtained as follow:
2NH₃ + 3BrO⁻ —> N₂ + 3Br⁻ + 3H₂O
From the balanced equation above,
2 moles of NH₃ reacted with 3 moles of BrO⁻.
Therefore,
0.01908 mole of NH₃ will react with = [tex]\frac{0.01908 * 3 }{2}\\\\[/tex] = 0.02862 mole of BrO⁻.
Finally, we shall determine the concentration of the BrO⁻ solution.
Mole of BrO⁻ = 0.02862 mole
Volume of BrO⁻ solution = 14.5 mL = 14.5 / 1000 = 0.0145 L
Concentration of BrO⁻ =?Concentration = mole / Volume
Concentration of BrO⁻ = 0.02862 / 0.0145
Concentration of BrO⁻ = 1.97 MTherefore, the concentration of the hypobromite solution (BrO⁻) is 1.97 M
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How can Catastrophic Events impact Biodiversity ? I need a paragraph response. Also relate it to Biomes .
science
Answer:
Natural catastrophes, such as hurricanes, floods, fires or earthquakes, among others, are events generated by nature itself that negatively impact the ecosystem, causing damage to the environment and the species that inhabit it, including the humans. Thus, for example, fires seriously affect the ecosystems on which they develop, destroying the biodiversity of vegetation and fauna that inhabit there, which threatens large numbers of species and puts a limit on their development and reproduction.
1. When an object wants to stay at rest or wants to stay in motion unless
an outside force comes and disturbs it.*
a binary compound of nitrogen and hydrogen has the following percentage composition: 82.27% nitrogen; 17.76% hydrogen. If the molar mass of the compound is determined by a separate experiment to be slightly more than 17g what are the empirical and molecular formulas of the compound
Answer:
Both empirical and molecular formulas are NH₃.
Explanation:
Hello.
In this case, since we know the percent compositions of both nitrogen and hydrogen, in order find out the molecular formula and the empirical formula of that compound, we can first assume we have 82.27 g of nitrogen and 17.76 g of hydrogen as a first approximation to compute the present moles:
[tex]n_N=82.27g/(14.01g/mol)=5.872mol\\\\n_H=17.76g/(1.01g/mol)=17.58mol[/tex]
Next, we compute the subscripts in the empirical formula first, by diving the moles of each element by the moles of the element with fewest moles:
[tex]N:\frac{5.872}{5.872}=1\\\\H:\frac{17.58}{5.872}=3[/tex]
It means that the empirical formula is NH₃ and its molar mass is about 17.04 g/mol which is about the same the reported molar mass slightly more than 17 g, it means that the molecular formula is also NH₃.
Best regards!
The most reactive groups in the Periodic Table are
A) Group 1 and 2 B) Group 1 and 17 C)Group 1 and 18 D)Group 17 and 18
Answer:
B) Group 1 and 17
Explanation:
alkali metals and the halogens are the most reactive because of valence electrons
All periods on the periodic table contain the same number of elements.
a. True
b. False
Answer:
False
Explanation: