Answer:
22
Explanation:
The atomic number indicates the amount of protons, so it would be 22
The heat from the bonfire is transferred to the student's hands through the process of
conduction
convection
radiation
reflection
Answer:
Radiation
Explanation:
how many molecules of methane, CH4 are in 125 g CH4
Answer:
4.69 x 10²⁴ molecules CH₄
Explanation:
To find the amount of molecules, you need to (1) convert grams to moles (via molar mass) and then (2) convert moles to molecules (via Avogadro's Number). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the sig figs of the given value (125 g).
Molar Mass (CH₄): 16.05 g/mol
Avogadro's Number:
6.022 x 10²³ molecules = 1 mole
125 g CH₄ 1 mole 6.022 x 10²³ molecules
---------------- x --------------- x ------------------------------------- =
16.05 g 1 mole
= 4.69 x 10²⁴ molecules CH₄
How many MOLES of sulfur hexafluoride are present in 2.33x1022 molecules of this compound
Answer:
0.0387 moles SF₆
Explanation:
To find the moles of sulfur hexafluoride (SF₆), you need to multiply the number of molecules by Avogadro's number. Avogadro's number is a ratio between molecules and moles. It is important to arrange the conversion in a way that allows for the cancellation of units (the desired unit should be in the numerator). The final answer should have 3 sig figs to match the sig figs of the given value (2.33 x 10²²).
Avogadro's Number:
6.022 x 10²³ molecules = 1 mole
2.33 x 10²² molecules SF₆ 1 mole
--------------------------------------- x ------------------------------------ = 0.0387 moles SF₆
6.022 x 10²³ molecules
Which of these accurately describes a difference between nuclear energy and
Fossil fuel?
A. In nuclear fuel reactions, heat is released that is used to do work.
B. In fossil fuel reactions, heat is released that is used to do work.
C. Fossil fuels have a higher energy density than nuclear fuel.
D. Nuclear fuel has a higher energy density than fossil fuels.
Answer:
Nuclear fuel has a higher energy density than fossil fuel
C3H8O dissolved in water
If C3H8O is dissolved in water, it would be expected to be a strong electrolyte.
What is a strong electrolyte?
A strong electrolyte is a solute or solution (already an electrolyte) that can completely dissociates in solution.
C3H8O is one of those compounds expected to be a strong electrolyte.
Thus, if C3H8O is dissolved in water, it would be expected to be a strong electrolyte.
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Calculate the volume of 32% HCl required to make about 1 N HCl in 100ml volumetric flask
9.82 mL is the volume of 32% HCl required to make about 1 N HCl in 100ml volumetric flask.
What is Law of Equivalent ?N₁V₁ = N₂V₂
where,
N₁ = Normality of solution with known concentration
V₁ = Volume of solution with known concentration
N₂ = Normality of solution with unknown concentration
V₂ = Volume of solution with unknown concentration
Now find the mass of solution
Mass = Density × Volume
= 1.16 × 0.32 × 1000
= 371.52 g
How to find the Normality ?Normality = [tex]\frac{\text{Weight}}{\text{Equivalent weight}}[/tex]
= [tex]\frac{371.52\ g}{36.5}[/tex]
= 10.18 equivalents
Now put the values in above formula we get
N₁V₁ = N₂V₂
1 × 100 = 10.18 × V₂
100 = 10.18 × V₂
[tex]V_{2} = \frac{100}{10.18}[/tex]
= 9.82 mL
Thus from the above conclusion we can say that 9.82 mL is the volume of 32% HCl required to make about 1 N HCl in 100ml volumetric flask.
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Consider the reaction of NaHCO3
with an acid, HA. How many grams of NaHCO3
are required to produce 1.76 g of CO2?
The mass of NaHCO₃ required to produce 1.76 g of CO₂ is 3.36 g
Balanced equationNaHCO₃ + HA --> NaA + CO₂ + H₂O
Molar mass of NaHCO₃ = 84 g/mol
Mass of NaHCO₃ from the balanced equation = 1 × 84 = 84 g
Molar mass of CO₂ = 44 g/mol
Mass of CO₂ from the balanced equation = 1 × 44 = 44 g
SUMMARY
From the balanced equation above,
44 g of CO₂ were produced from 84 g of NaHCO₃
How to determine the mass of NaHCO₃ neededFrom the balanced equation above,
44 g of CO₂ were produced from 84 g of NaHCO₃
Therefore,
1.76 g of CO₂ will be produced from = (1.76 × 84) / 44 = 3.36 g of NaHCO₃
Thus, 3.36 g of NaHCO₃ is needed for the reaction
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What kind of reaction is this?
H₂SO4 + Ca -> CaSO4 + H₂
H2
O Double Replacement
O Decomposition
O Single Replacement
O Synthesis
PODBROERENC
Huntinlupracany
PARKERAM
Meccceeee!
20
The reaction H₂SO₄ + Ca ⇒ CaSO₄ + H₂ is a Single Replacement reaction because Ca replaces H in H₂SO₄.
What is a chemical reaction?It is a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction.
Let's consider the following reaction.
H₂SO₄ + Ca ⇒ CaSO₄ + H₂
What kind of reaction is this?
Double Replacement. No. In double replacement reactions both compounds exchange anions and cations.Decomposition. No. In decompositions, a big compound decomposes into smaller ones.Single Replacement. Yes. one element (Ca) replaces another element (H) in its compound.Synthesis. No. In synthesis, 2 or more substances combine to form a bigger one.The reaction H₂SO₄ + Ca ⇒ CaSO₄ + H₂ is a Single Replacement reaction because Ca replaces H in H₂SO₄.
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The theory of plate tectonics describes the movement of the plates across the Earth's lithosphere (the crust and upper mantle) through immense periods of time. Earth's litoshphere is composed of 7 (or 8, depending on how they are defined) major plates and many more minor plates.
The movement is attributed to different phenomena stemming from Earth's rotation, gravity, and mantle dynamics. All of these forces play a role in influencing the size, shape, and positioning of the different landmasses that currently shape our continents and islands.
Earth's rotation, gravity, and mantle dynamics play greater role in reshaping the land of continents and Islands.
What factors influence the size, shape and position of land?Earth's rotation, gravity, and mantle dynamics are the forces that play a significant role in influencing the size, shape, and positioning of the different landmasses of our continents and islands. These forces are responsible for the change in shape of land masses with the passage of time.
So we can conclude that Earth's rotation, gravity, and mantle dynamics play greater role in reshaping the land of continents and Islands.
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Describes the movement of the plates across the Earth's lithosphere?
Calculate the osmotic pressure of 20 m solution of
LiCl at 25C
Answer:
979 atm
Explanation:
To calculate the osmotic pressure, you need to use the following equation:
π = i MRT
In this equation,
-----> π = osmotic pressure (atm)
-----> i = van't Hoff's factor (number of dissolved ions)
-----> M = Molarity (M)
-----> R = Ideal Gas constant (0.08206 L*atm/mol*K)
-----> T = temperature (K)
When LiCl dissolves, it dissociates into two ions (Li⁺ and Cl⁻). Therefore, van't Hoff's factor is 2. Before plugging the given values into the equation, you need to convert Celsius to Kelvin.
i = 2 R = 0.08206 L*atm/mol*K
M = 20 M T = 25°C + 273.15 = 298.15 K
π = i MRT
π = (2)(20 M)(0.08206 L*atm/mol*K)(298.15 K)
π = 979 atm
Carbon monoxide and chlorine gas react to form phosgene:
If a reaction mixture initially contains 215 torr of CO and 245 torr of Cl2, what is the mole fraction of COCl2 when equilibrium is reached?
CO(g) + Cl2(g) ↔COCl2
KP= 310 atm at 700k
Carbon monoxide and chlorine gas react to form phosgene. If a reaction mixture initially contains 215 torr of CO and 245 torr of Cl₂. 0.76 is the mole fraction of COCl₂ when equilibrium is reached.
How to find Mole fraction ?CO(g) + Cl₂ (g) → COCl₂ (g) Kp = 310
With this reaction we can write the Kp expression
[tex]K_{p} = \frac{p_{COCl_2}}{p_{CO} \times p_{Cl_2}}[/tex]
We know that 1 atm = 760 torr
Now
[tex]p_{CO} = \frac{215 \times 1}{760}[/tex]
= 0.28 atm
[tex]p_{Cl_2} = \frac{245 \times 1}{760}[/tex]
= 0.32 atm
Now, we can write an ICE chart with pressures, so we can know the pressure of COCl₂.
CO(g) + Cl₂ (g) → COCl₂ (g) Kp = 310
I: 0.28 0.32 0
C: -x -x +x
E: 0.28 - x 0.32 - x x
Now put the value in Kp expression
[tex]K_{p} = \frac{p_{COCl_2}}{p_{CO} \times p_{Cl_2}}[/tex]
[tex]310 = \frac{x}{(0.28 - x) (0.32 - x)}[/tex]
[tex]310 = \frac{x}{0.0896 - 0.28x - 0.32x + x^2}[/tex]
310 (0.0896 - 0.28x - 0.32x + x²) = x
310 (0.0896 - 0.6 x + x²) = x
27.776 - 186 x + 310 x² = x
310 x² -187 x + 27.776 = 0
By using the quadratic equation find the value of x:
[tex]x = \frac{b \pm \sqrt{b^2 - 4ac}}{2a}[/tex]
[tex]= \frac{187 \pm \sqrt{(187)^2 - 4 \times 310 \times 27.776}}{2 \times 310}[/tex]
[tex]= \frac{187 \pm \sqrt{34969 - 34,442.24}}{620}[/tex]
[tex]= \frac{187 \pm \sqrt{526.76}}{620}[/tex]
[tex]= \frac{187 \pm 22.95}{620}[/tex]
[tex]= \frac{187 + 22.95}{620}\ \text{or}\ \frac{187 - 22.95}{620}[/tex]
[tex]= \frac{209.95}{620}\ \text{or}\ \frac{164.05}{620}[/tex]
[tex]= 0.33\ \text{or}\ 0.26[/tex]
Using the lowest value of x, we have that the partial pressure of COCl₂ would be 0.26 atm.
PpCO = 0.28 - x = 0.28 - 0.26 = 0.02
PpCl₂ = 0.32 - x = 0.32 - 0.26 = 0.06
[tex]X_{COCl_2} = \frac{P_{COCl_2}}{Pt}[/tex]
And Pt is the total pressure of all species in reaction so:
Pt = 0.02 + 0.06 + 0.26 =
= 0.34 atm
The mole fraction:
[tex]X_{COCl_2} = \frac{0.26}{0.34}[/tex]
= 0.76
Thus from the above conclusion we can say that Carbon monoxide and chlorine gas react to form phosgene. If a reaction mixture initially contains 215 torr of CO and 245 torr of Cl₂. 0.76 is the mole fraction of COCl₂ when equilibrium is reached.
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Students in a chemistry lab are making the compound cobalt(II) carbonate.
It can be made by reacting sodium carbonate solution with cobalt(II) chloride solution. Calculate the volume of 2.0 mol/L cobalt(II) chloride solution required to completely react with 250 mL of 1.5 mol/L sodium carbonate.
The volume of 2.0 mol/L cobalt(II) chloride solution required for the reaction is 187.5 mL
How to determine the mole of Na₂CO₃ in the solutionVolume of Na₂CO₃ = 250 mL = 250 / 1000 = 0.25 LMolarity of Na₂CO₃ = 1.5 mol/LMole of Na₂CO₃ = ?Mole = molarity × volume
Mole of Na₂CO₃ = 1.5 × 0.25
Mole of Na₂CO₃ = 0.375 mole
How to determine the mole of CoCl₂ neededBalanced equation
CoCl₂ + Na₂CO₃ -> CoCO₃ + 2NaCl
From the balanced equation above,
1 mole of Na₂CO₃ reacted with 1 mole of CoCl₂.
Therefore,
0.375 mole of Na₂CO₃ will also react with 0.375 mole of CoCl₂.
How to determine the volume of CoCl₂Molarity of CoCl₂ = 2 mol/LMole of CoCl₂ = 0.375 moleVolume of CoCl₂ = ?Volume = mole / molarity
Volume of CoCl₂ = 0.375 / 2
Volume of CoCl₂ = 0.1875 L
Multiply by 1000 to express in mL
Volume of CoCl₂ = 0.1875 × 1000
Volume of CoCl₂ = 187.5 mL
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Analysis of a sample of hydrated salt shows that it contains 4.86 g Mg, 6.20 g P, 11.20 g O, and 5.40 g H2O. What is the formula of the hydrated salt?
Answer:
Mg₂P₂O₇ · 3 H₂O
Explanation:
(Step 1)
First, you need to convert each mass to moles via the molar masses of each element/compound.
Molar Mass (Mg): 24.305 g/mol
4.86 grams Mg 1 mole
------------------------ x ------------------------ = 0.200 moles Mg
24.305 grams
Molar Mass (P): 30.974 g/mol
6.20 grams P 1 mole
--------------------- x ------------------------ = 0.200 moles P
30.974 grams
Molar Mass (O): 15.998 g/mol
11.20 grams O 1 mole
----------------------- x ----------------------- = 0.700 moles O
15.998 grams
Molar Mass (H₂O): 2(1.008 g/mol) + 15.998 g/mol
Molar Mass (H₂O): 18.014 g/mol
5.40 grams H₂O 1 mole
-------------------------- x ----------------------- = 0.300 moles H₂O
18.014 grams
(Step 2)
To find the amount of each element/compound in the formula, you need to divide each molar value by the smallest molar value. This allows you to determine the accurate molar ratio the hydrated salt should have. In this case, 0.200 moles is the smallest value.
0.200 moles Mg / 0.200 = 1 mole Mg
0.200 moles P / 0.200 = 1 mole P
0.700 moles O / 0.200 = 3.5 moles O
0.300 moles H₂O / 0.200 = 1.5 moles H₂O
There can only be whole number amounts of each element/compound in the formula. Therefore, you need to multiply each amount by 2.
1 mole Mg x 2 = 2 moles Mg
1 mole P x 2 = 2 moles P
3.5 moles O x 2 = 7 moles O
1.5 moles H₂O x 2 = 3 moles H₂O
(Step 3)
Now that we know the amount of each element/compound, we can build the formula. The amount of each element is represented by subscripts and the amount of each compound (H₂O) is represented by coefficients.
Mg₂P₂O₇ · 3 H₂O
what is the Thermodynamics of leaching of ilmenite in hydrochloric acid for titania pigment production?
The thermodynamics of leaching of ilmenite in hydrochloric acid for titania pigment production is an industrial production of nano-sized titanium dioxide (TiO2).
What is thermodynamics?Thermodynamics is defined as the change in the energy of system that brings about work in that system.
The leaching of ilmenite which is a titanium-iron oxide mineral with HCl can lead to the production of titanium dioxide (TiO2).
The use of thermodynamics in this process controls the heat and energy of the leaching system leading to a better yield of final products.
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A concept map for four types of intermolecular forces and a certain type of bond is shown.
No
A
No
Are molecules
with permanent
dipoles present?
Yes
Is H atom
bonded to F, O, or
Natom?
No
B
Are ions
present?
Yes
C
Yes
Are polar
molecules
present?
Yes
D
No
E
Compare the relative strength of the two forces C and D. Explain how you determined this comparison by identifying the forces.
XD
ΩΣ
Source
C
In the case the relative strength of the two forces C and D is that D represents a ion-dipole forces, which are known to be very much stronger than the force that is said to be represented by C.
What is the aim of concept map?A concept map is known to be a kind of a special type of a web diagram that is often used in the exploration of knowledge and gathering and also in sharing of information.
Note that Concept mapping is a strategy used in creating the idea of a map as it is made up of a visual depiction of ideas, theories, and others.
Note that Intermolecular forces are known to be those forces that are said to be attractive and also a kind of a repulsive forces that is seen between the molecules of a substance.
Looking at the image attached, In regards to the relative strength of the two forces C and D. The fact is that D stands for ion-dipole forces, which are known to be very much stronger than the force that is said to be represented by C.
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in gas expansion, 89J of heat is absorbed from surroundings and the energy of the system is decreased by 125J. Calculate the work done
From the first law of thermodynamics, the work done is -36 J.
What is the work done?We are told that the gas is expanding hence it does work while heat is absorbed from the surroundings. This implies that q is positive while w is negative.
Hence;
U = q - w
w = q - U
w = 89J - 125J
w = -36 J
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The atom is sometimes said to be similar to a miniature planetary system, with electrons orbiting the nucleus. What does the uncertainty principle have to say about this view of the atom?
Answer:
The uncertainty principle says this view is only a guess, a snapshot of what the electrons around the nucleus could possibly look like. Specifically, the uncertainty principle says that we cannot know the exact location and speed of the electrons. Therefore, the planetary-like arrangement of the electrons around the nucleus is rarely ever assumed.
A piece of string is found to be 35.9 meters long. How long is the string in inches?
Answer: 1413.39 inches
Explanation:
Formula for converting meters to inches
Meters x 39.37 (roughly) = Value in inches
Applying formula
35.9 meters x 39.37 = 1413.39 inches (roughly)
PLEASE HELP!!!
If a 435 mL sample of gas at 219 °C is allowed to expand (at constant pressure) to a volume of 842 mL, what will be the new temperature (in °C)?
Answer:
424 °C
Explanation:
If all other variables are held constant, the missing temperature can be found using the Charles' Law equation:
V₁ / T₁ = V₂ / T₂
In this equation, "V₁" and "T₁" represent the initial volume and temperature. "V₂" and "T₂" represent the final volume and temperature. You can plug the given values into the equation and simplify to find the final temperature.
V₁ = 435 mL V₂ = 842 mL
T₁ = 219 °C T₂ = ? °C
V₁ / T₁ = V₂ / T₂ <----- Charles' Law
435 mL / 219 °C = 842 mL / T₂ <----- Insert values
1.9863 = 842 mL / T₂ <----- Simplify left side
(1.9863) x T₂ = 842 mL <----- Multiply both sides by T₂
T₂ = 424 °C <----- Divide both sides by 1.9863
What are the molecular polarity and the intermolecular forces present in the sun
The molecular polarity of the sun is the dipoole separation of electric charge leading to a molecule in the sun.
What is molecular polarity?Molecular polarity simply refers to those regions of molecules containing or possessing positive and negative charge
So therefore, the molecular polarity of the sun is the separation of electric charge leading to a molecule in the sun.
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Balance the equation below and identify the type.
NH4NO₂(s)---> N₂(g) + H₂O(l)
PLEASE ANSWER NEED BY MIDNIGHT TONIGHT!!!!!!
Radium-223 nuclei usually decay by alpha emission. Once in every billion decays, a radium-223 nucleus emits a carbon-14 nucleus.
Write a balanced nuclear equation for carbon-14 emission.
The equation for carbon-14 emission by Radium-223 nuclei is given below:
[tex]^{223}_{88}Ra \rightarrow\: ^{209}_{82}Pb + \:^{14}_{6}C[/tex]
What is radioactivity?Radioactivity is the spontaneous decay of a substance with emission of radiation.
The equation for carbon-14 emission by Radium-223 nuclei is given below:
[tex]^{223}_{88}Ra \rightarrow\: ^{209}_{82}Pb + \:^{14}_{6}C[/tex]
In conclusion, the emission of carbon-14 by Radium-223 nuclei produces Lead-209 nuclei.
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An object weighs 32 newtons. What is its mass if a gravitometer indicates that g = 8.25 m/sec2?
Answer:
3.88kg
Explanation:
weight=mass_of_body(m) x acceleration_due_to_gravity(g)
The weight is given and acceleration is also give
For mass divide the weight by acceleration.
What volume of 0.555M KNO3 solution would contain 12.5 g of solute
The volume of 0.555M KNO3 solution would contain 12.5 g of solute iss 223 mL.
What is the relationship between mass of solute and concentration of solution?The mass of solute in a given volume of solution is related by the formula below:
Molarity = mass/(molar mass * volume)Therefore, volume of solution is given by:
Volume = Mass /molarity * molar mass
Molar mass of KNO₃ = 101 g/mol
Volume = 12.5/(0.555 * 101)
Volume = 0.223 L or 223 mL
In conclusion, the volume of the solution is obtained from the molarity of solution as well as mass and molar mass of solute.
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perform the following mathematical operation, and report the answer to the correct number of significant figures. 0.34 x 0.568=?
How do I know how many significant figures to round to?
The correct answer to the problem is 0.193 which is three significant figures.
What are significant figures?The term significant figures has to do with the figures that have a mathematical meaning. We know that the result has to correspond to the highest number of significant figures.
Hence, If we multiply 0.34 x 0.568 the result ought to be recorded as 0.193 which is three significant figures.
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A reaction produces 156 mL of carbon dioxide gas collected
over water at a temperature of 25.0 °C and a pressure of 99.81
kPa. Calculate the volume of CO2 at STP.
mL
Your answer should be rounded to three significant figures. Do not include units
In your answer.
The volume of the CO₂ produced at STP, given the data is 141 mL
Combined gas equationP₁V₁ / T₁ = P₂V₂ / T₂
Where
Initial pressure => P₁Initial temperature => T₁Initial volume => V₁New pressure => P₂New temperature => T₂New Volume => V₂Data obtained from the questionInitial volume (V₁) = 156 mL Initial temperature (T₁) = 25.0 °C = 25 + 273 = 298 KInitial pressure (P₁) = 99.81 KPaNew pressure (P₂) = STP = 101.325 KPaNew temperature (T₂) = STP = 273 KNew volume (V₂) =? How to determine the volume at PP₁V₁ / T₁ = P₂V₂ / T₂
(99.81 × 156) / 298 = (101.325 × V₂) / 273
Cross multiply
298 × 101.325 × V₂ = 99.81 × 156 × 273
Divide both sides by 298 × 101.325
V₂ = (99.81 × 156 × 273) / (298 × 101.325)
V₂ = 141 mL
Thus, the volume of the CO₂ produced at STP is 141 mL
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Write an equation for the neutralization of lemon juice with baking soda. Your equation should show a proton transfer to form carbonic acid and a salt.
The equation of the neutralization reaction is:
HOC(CO₂H)(CH₂CO₂H)₂ + Na₂CO₃ ----> HOC(CO₂Na)(CH₂CO₂Na)₂ + H₂O
What is the acid in lemon juice?The main acid in lemon juice is citric acid.
Citric acid is a tricarboxylic acid and will react with baking soda to form a salt and water.
The equation of the neutralization reaction is shown below:
HOC(CO₂H)(CH₂CO₂H)₂ + Na₂CO₃ ----> HOC(CO₂Na)(CH₂CO₂Na)₂ + H₂O
In conclusion, the neutralization of citric acid in lemon juice produces a salt and water.
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7. Which of the following compound is the most soluble in CC14? C. NH3 A. HF B. NaCl D. C10H22
C10H22 is a compound which is the most soluble in CC14 because both are non-polar in nature.
Why polar solute soluble in polar solvent?We know that like dissolve like which means that polar solutes only dissolve in polar solvent while on the other hand, non-polar solutes only dissolve in non-polar solvent.
So we can conclude that C10H22 is a compound which is the most soluble in CC14 because both are non-polar in nature.
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I need help with my work
Answer:
I'm thinking you should go for the option C.
What is the molality of lithium ions in a 0.302 m solution of Li₃PO₄ assuming the compound dissociates completely?
The molality of the lithium ions is calculated as 0.906 m
What is the molality of lithium ions?Given that the compound is written as Li₃PO₄, the dissociation of the compound is given by the equation;
Li₃PO₄ -----> 3Li^+ + PO₄^3-
Since there are three mole of lithium ions in the compound, it the follows that the molality of the lithium ions is;
3 * 0.302 m = 0.906 m
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