Answer:
C3H6O
Explanation:
Data obtained from the question. This includes:
Carbon (C) = 0.62069 g
Hydrogen (H) = 0.103448 g
Oxygen (O) = 0.275862 g
The empirical formula can be obtained as follow:
Step 1:
Divide by their molar mass.
C = 0.62069 / 12 = 0.0517
H = 0.103448 / 1 = 0.103448
O = 0.275862 / 16 = 0.0172
Step 2:
Divide by the smallest number.
C = 0.0517 / 0.0172 = 3
H = 0.103448 / 0.0172 = 6
O = 0.0172 / 0.0172 = 1
Step 3:
Writing the empirical formula.
The empirical formula is C3H6O
Answer:
The empirical formula is C3H6O
Explanation:
Step 1: Data given
A sample of ethyl butyrate contains:
0.62069 g of carbon
0.103448 g of hydrogen
0.275862 g of oxygen
Atomic mass of carbon = 12.01 g/mol
Atomic mass of hydrogen = 1.01 g/mol
Atomic mass of oxygen = 16.0 g/mol
Step 2: Calculate moles
Moles = mass / molar mass
Moles carbon = 0.62069 grams / 12.01 g/mol
Moles carbon = 0.0517 moles
Moles hydrogen = 0.103448 grams / 1.01 g/mol
Moles hydrogen = 0.1024 moles
Moles oxygen = 0.275862 grams / 16.0 g/mol
Moles oxygen = 0.0172 moles
Step 3: Calculate the mol ratio
We divide by the smalllest amount of moles
C: 0.0517 moles / 0.0172 moles = 3
H: 0.1024 moles / 0.0172 moles = 6
O: 0.0172 moles / 0.0172 moles = 1
The empirical formula is C3H6O
A 0.7500 L solution has been boiled down to a new volume of 0.4510 L with a concentration of 2.033 M. What was the initial concentration of the solution?
Answer:5.3mol
Explanation:
According to the ideal gas law for a fixed amount of gas, if the _____ is constant, then when the ________ increases the volume should ________.
a) temperature, pressure, increase
b) pressure, temperature, decrease
c) pressure, volume, decrease
d) none of the above
Answer:
D. none of the above
Explanation:
A. is wrong because pressure and volume have an inverse relationship. When one increases the other decreases, this is not an option.
B. is wrong because temperature and volume have a proportional relationship. One one goes up, the other goes up or vice versa.
C. is wrong because volume cannot increase the then decrease at the same time.
Magnesium, the element, is produced commercially by electrolysis from a molten salt (the "electrolyte") using a cell similar to the one. Recall that in an electrolytic cell the anode is given the + sign and the cathode is given the - sign, which is the opposite of what we see in batteries. What half-reaction occurs at the anode in this electrolytic cell?
Answer:
The half-reaction that occurs on the anode of an electrolytic cell is called oxidation.
This can easily be depicted by a chemical reaction as such "Zn(s) = Zn2+ (aq) + (2e-)"
While, the Zinc in this reaction loses two elections. Hence copper gains those electrons and becomes solid.
These reactions occurring on the anode are called positive reactions.
While the reaction that occurs on the cathode is called reduction. This reaction can be represented by this equation "Cu2+ (aq) + 2e- = Cu(s)".
These non-spontaneous reactions occurring in an electrolytic cell together are called redox reactions. These generate electrical energy.
In the electrolytic cell for commercial magnesium production, the half-reaction at the anode (positive electrode) is oxidation, where electrons are lost. If magnesium chloride is the electrolyte, chloride ions are oxidized to form chlorine gas.
Explanation:In the electrolytic cell used for the commercial production of magnesium, the anode is the positive electrode. As it is where oxidation occurs, the half-reaction happening at the anode involves the removal of electrons. The specific half-reaction varies based on the electrolyte used. If pure molten magnesium chloride (MgCl2), a common electrolyte, is used, the half-reaction at the anode would be: Cl- —> Cl2 + 2e- . This equates that chloride ions (Cl-) lose electrons (are oxidized) to form chlorine gas (Cl2).
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A chemical reaction has an energy of activation Ea = 1∙104 J mol-1 at T = 300 K. The first-order rate constant for this reaction was found to be 15.0 s-1. In the presence of a catalyst, the activation energy is reduced to 1∙103 J mol-1. Calculate the pre-exponential factor in the Arrhenius equation
Answer : The pre-exponential factor in the Arrhenius equation is, 14.99 s⁻¹
Explanation :
Using Arrhenius equation,
[tex]K=A\times e^{\frac{-Ea}{RT}}[/tex]
Taking ln on both the sides, we get:
[tex]\ln K=\frac{-Ea}{RT}+\ln A[/tex]
where,
K = rate constant = [tex]15.0s^{-1}[/tex]
Ea = activation energy = 1.104 J/mol
T = temperature = 300 K
R = gas constant = 8.314 J/mole.K
A = Arrhenius constant
Now put all the given values in the above formula, we get the value of \ln a.
[tex]\ln (15.0s^{-1})=\frac{1.104J/mol}{(8.314J/mole.K)\times (300K)}+\ln A[/tex]
[tex]\ln A=2.708s^{-1}[/tex]
[tex]A=14.99s^{-1}[/tex]
Therefore, the pre-exponential factor in the Arrhenius equation is, 14.99 s⁻¹
A chemist makes 360mL of calcium sulfate working solution by adding distilled water to 90.0mL of a 10.7mmol/L stock solution of calcium sulfate in water. Calculate the concentration of the chemist's working solution. Round your answer to 3 significant digits.
Answer: The concentration of the chemist's working solution is 0.00268 M
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.
According to the neutralization law,
[tex]M_1V_1=M_2V_2[/tex]
where,
[tex]M_1[/tex] = molarity of stock solution = 10.7 mmol/L = 0.0107 mol/L [tex]1mmol=10^{-3}mol[/tex]
[tex]V_1[/tex] = volume of stock solution = 90.0 ml
[tex]M_2[/tex] = molarity of working solution = ?
[tex]V_2[/tex] = volume of working solution = 360 ml
[tex]0.0107\times 90.0=M_2\times 360[/tex]
[tex]M_2=0.00268M[/tex]
Thus the concentration of the chemist's working solution is 0.00268 M
Help me please I am stuck
Answer:
Castings
Explanation:
Worm castings contain concentrated nitrates, calcium, etc.
15 grams of HCl should theoretically produce 0.42 grams of H2. The reaction actually produced 0.15 grams of H2. What is the percentage yield of H2?
Steps to solution please
Answer:
35.7%
Explanation:
The percent yield is calculated by the formula:
[(actual yield) / (theoretical yield)] * 100
In this case, the actual yield is 0.15 grams, and the theoretical yield is 0.42 grams. So, putting these values into the equation, we have:
[tex]\frac{0.15}{0.42} *100=0.357*100=35.7[/tex]
Thus, the percent yield of [tex]H_2[/tex] is 35.7%.
Hope this helps!
The percentage yield of a reaction is calculated using the equation: (Actual Yield / Theoretical Yield) * 100. In this case, the percentage yield of the reaction that produced H2 is approximately 35.7%.
Explanation:The subject of this question is the percentage yield of a chemical reaction. In chemistry, the percentage yield is a measure of the efficiency of a reaction. It's calculated by dividing the actual yield (the amount of product actually produced) by the theoretical yield (the maximum amount of product that could be produced) and then multiplied by 100 to convert it to a percentage.
Given in the question, the theoretical yield of H2 is 0.42 grams and the actual yield is 0.15 grams. So, to calculate the percentage yield, we would use the formula: (Actual Yield / Theoretical Yield) * 100
Substituting the given amounts, the calculation would look like this: (0.15 / 0.42) * 100 = 35.7%.
So, the percentage yield of H2 in this reaction is approximately 35.7%.
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Consider the following three solutions:(i) 0.10 M solution of a weak monoprotic acid(ii) 0.10 M solution of strong monoprotic acid(iii) 0.10 M solution of a weak diprotic acidEach solution is titrated with 0.15 M NaOH.Which of the following will be the same for all three solutions?A. the volume required to reach the final equivalence point B. the volume required to reach the first equivalence point C. the pH at the first equivalence point D. the pH at one-half the first equivalence point
Answer:
Option B
Explanation:
We have the tree solutions here:
A: weak monoprotic acid HA
B: Strong monoprotic acid HA'
C: weak diprotic acid H₂A
In order to explain this, let's discart the options one by one.
C and D cannot be the correct choice. This is because the pH is an expression that is determined by the following expression:
pH = -log[H₃O⁺]
In order to be the same value for all the solutions, the concentration of hydronium should be the same for all. This will be correct if all solutions were monoprotic and strong. However this is not the case.
Solution A and C are weak acids, so this means that they have dissociation constant Ka (In the case of C, it has two Ka values because it's diprotic). So, when these solutions reach the equivalence point or half the equivalence point, the concentration of the acid do not dissociate completely in solution, instead it do this:
HA + H₂O -------> A⁻ + H₃O⁺ Ka
0.1 0 0
0.1-x x x
[H₃O⁺] = x
Same thing happen with C, but we can see that the concentration is not the same as the innitial concentration.
Solution B is a strong acid, so it will dissociate completely in solution, so concentration of hydronium will be the same of the initial acid, and therefore the pH cannot be the same in the three solutions.
Option A cannot be either because, we have a diprotic solution, this means this acid requires two equivalence points to reach it's final, so, it takes more time and volume to reach the end point. Therefore, it's not the correct option.
Option B is the correct one, because regardless that we have a weak or a strong acid, or if it's diprotic or triprotic, the three of them have the same concentration of acid, and to reach the first equivalence point (the only point for A and B) will be the same for solution C. Therefore, this is the only thing the three solutions have in common.
The activation energy for this reaction is 75 kJ⋅mol−1. The enzyme catalase, found in blood, lowers the activation energy to 8.0 kJ⋅mol−1. At what temperature would the non‑catalyzed reaction need to be run to have a rate equal to that of the enzyme‑catalyzed reaction at 25 ∘C?
lanation:
It has to be 30 degrees
Which of the following reactions is balanced?
A.CaCl2 + 2H2CO3 = CaCO3 + HCI
B.2C2Cl2 + H2CO3 +CaCO3 + HCl
C.CaCl2 + H2CO3 + 2CaCO3 + HCI
D.CaCl2 + H2CO3 + CaCO3 + 2HCI
Answer: D
Explanation:
Because in the reactant side there's/re 1 Ca atom as well as in the product side
2 Cl atoms as well as in the product side
2 H atoms as well as in in the product side
1 C atom as well as in the product side
3 O atoms as well as in the product side
Hope this help^^
The chemical equation occurs whenever the number of atoms included in the side of the reaction equals the atomic mass involved inside the product's side. Following are calculations to the balanced reaction:
Sides of the reactant:
[tex]\bold{1 \ mole\ Ca, 2\ moles \ Cl^{-}, 2\ moles\ H, and\ 1\ mole \ CO_{3}^{2-} }[/tex]are present on the reactant's side.Calculating the product side:
[tex]\bold{1 \ mole\ Ca, 2\ moles \ Cl^{-}, 2\ moles\ H, and\ 1\ mole \ CO_{3}^{2-} }[/tex] are present on the reactant's side.Since the number of moles of element atoms/ions on both the reactants and the sides of the product of the given interaction is the same.Therefore, the answer is "option D".
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If you have a heartburn, how you could you safely help the situation
Answer:Eat a light dinner and avoid foods that trigger your heartburn. Don't lie down for at least 2 to 3 hours after you eat. Use blocks or books to raise the head of your bed by 4-6 inches. Or put a foam wedge under your mattress at the head of the bed.
Explanation:
Airplane cabins are pressurized so passengers can breathe comfortably at altitudes of up to 9,200 meters (30,000 feet).The air pressure inside the cabin at this altitude, however, is still lower than the atmospheric pressure at sea level. A passenger opens a resealable bag of raisins before the plane takes off from approximately sea level. He reseals the bag and leaves some air surrounding the raisins. What will the bag most likely look like when the plane is at its highest altitude?
Answer:
It will have expanded
Explanation:
Answer:
It will have expanded
Explanation:
which produces a higher than normal tide?
a Spring Tide or Neal Tide?
and why
Answer:
spring tide
Explanation:
when both the sun and moon aligned th affect of each is added together producing higher than normal tides called SPRING TIDES
Answer:
Spring Tide
Explanation:
In both cases, the gravitational pull of the sun is 'added' to the gravitational pull of the moon on Earth, causing the oceans to bulge a bit more than usual. This means that high tides are higher and low tides are lower than average. These are called 'spring tides.
HELP FAST!!!
As energy in the form of heat is added to an ice cube, it begins to melt. Which is a valid claim about what causes melting?
A Heat causes the molecules in the ice cube to expand and forces them apart.
B Heat removes thermal energy from the ice cube and causes it to become liquid water.
CThe additional energy causes the bonds between hydrogen and oxygen in the ice cube to break.
DThe transfer of thermal energy to the ice cube causes its molecules to move faster.
Answer:
Explanation:
D. The transfer of thermal energy to the ice cube causes its molecules to move faster.
Answer:
its A heat causes the molecules in the cube to expand and forces them apart.
Explanation:
Partial charges will exist on each atom when a bond exists between two atoms with different electronegativities. Since the atom with a higher electronegativity will have a stronger ability to attract electrons, it will have a partial _________ charge. The atom with a lower electronegativity will have an equal and opposite _________ charge. As the difference in electronegativity increases, the resulting magnitudes of the partial charges will ___________.
Answer:
negative, positive, increase
Explanation:
From the given question,
During the formation of bond, between two atoms with difference between their electronegativity-
The more electronegative atom, will pull the electrons towards itself , and hence acquires a partial negative charge,And,
The less electronegative atom, will acquire a partial positive charge.The more the difference between the electronegativity of the atoms, the more would be the magnitude of partial charge.And, the less would be the difference between the electronegativity of the atoms, the lesser would be the magnitude of partial charge.Atoms with different electronegativities share electrons unequally, leading to partial charges. The more electronegative atom gains a partial negative charge, while the other has a partial positive charge. Larger electronegativity differences intensify these charges.
Explanation:When two atoms with different electronegativities form a covalent bond, the atom with higher electronegativity will attract shared electrons more and will have a partial negative charge. Conversely, the atom with lower electronegativity will have an equal and opposite partial positive charge. As the difference in electronegativity increases, the resulting magnitudes of the partial charges will also increase.
True or false: Chemical and physical changes alter matter?
Answer:
False
Explanation:
Chemical changes do change the composition of the substance. However, physical changes do not; physical changes simply alter the physical form of the substance.
For example, a melting ice cube is undergoing a physical change, but its overall composition of H2O isn't changing. It's just changing from a solid form to a liquid form.
Hope this helps!
Answer:
false
Explanation:
A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity. Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding.
What type of potential energy does a stretched rubber band have?
-Mechanical Kinetic energy
-Chemical Potential energy
-Elastic Potential energy
-Electromagnetic energy
A sample of neon gas occupies a volume of 2.8L at 1.8 atm. What would its volume be at 1.2 atm?
Answer:
4.2 L
Explanation:
Use Boyle's Law and rearrange formula.
- Hope this helps! Please let me know if you need further explanation.
To find the volume of the neon gas at 1.2 atm, we can use the combined gas law equation.
Explanation:To solve this problem, we can use the combined gas law equation:
P1V1 / T1 = P2V2 / T2
First, we need to convert the given volume in liters to moles using the ideal gas law equation:
V1 = nRT1 / P1
Then, we can rearrange the combined gas law equation to solve for V2:
V2 = (P2 * V1 * T2) / (P1 * T1)
Substituting the given values, we get:
V2 = (1.2 atm * 2.8 L * 273 K) / (1.8 atm * 273 K) = 1.233 L
Therefore, the volume of the neon gas at 1.2 atm would be 1.233 liters.
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The salt that is formed during the reaction between potassium hydroxide and hydrochloric acid is
Answer:
Sodium chloride (NaCl)
Explanation:
According to Arrhenius, an acid is a substance that dissociates to give protons, whereas a base dissociates to give hydroxide ions in an aqueous solution.
Therefore, a chemical reaction in which an Arrhenius acid reacts with an Arrhenius base to give salt and water, is known as a Neutralization reaction.
For example: Neutralization reaction of hydrochloric acid (HCl) and sodium hydroxide (NaOH)
A strong acid, hydrochloric acid (HCl) reacts with a strong base, sodium hydroxide (NaOH) to give salt, sodium chloride (NaCl) and water (H₂O).
The chemical equation for this Neutralization reaction:
HCl (acid) + NaOH (Base) → NaCl (Salt) + H₂O (Water)
Therefore, sodium chloride (NaCl) is the salt formed during the chemical reaction of hydrochloric acid (HCl) and sodium hydroxide (NaOH).
When are endothermic reactions beneficial for humans?
Answer:
An endothermic reaction is one that absorbs energy in the form of heat or light. ... This is why we burn fuels (such as paraffin, coal, propane and butane) for energy, because the chemical changes that take place during the reaction release huge amounts of energy, which we then use for things like power and electricity.
Explanation:
Many endothermic reactions helps us i our daily life.
Combustion reactions
The burning of fuel is an example of a combustion reaction, and we as humans rely heavily on this process for our energy requirements. The following equations describe the combustion of a hydrocarbon such as petrol :
fuel + oxygen heat + water + carbon dioxide
This is why we burn fuels (such as paraffin, coal, propane and butane) for energy, because the chemical changes that take place during the reaction release huge amounts of energy, which we then use for things like power and electricity. You should also note that carbon dioxide is produced during this reaction. The chemical reaction that takes place when fuels burn has both positive and negative consequences. Although we benefit from heat, power and electricity the carbon dioxide that is produced has a negative impact on the environment.
Lightsticks or glowsticks are used by divers, campers, and for decoration and fun. A lightstick is a plastic tube with a glass vial inside it. To activate a lightstick, you bend the plastic stick, which breaks the glass vial. This allows the chemicals that are inside the glass to mix with the chemicals in the plastic tube. These two chemicals react and release energy. Another part of a lightstick is a fluorescent dye which changes this energy into light, causing the lightstick to glow! This is known as phosphorescence or chemiluminescence.
what are the three types of nuclear radiation?
alpha particles, beta particles, and gamma rays
alpha particles, beta rays, and gamma rays
alpha rays, beta particles, and gamma rays
alpha rays, beta rays, and gamma particles
alpha ,beta and gamma are nuclear radiation
Which of the following chemical reactions will produce a precipitate?
Answer:
CACO3 is a precipitate. answer C definitely.
The chemical reaction that will produce a precipitate is:
C. [tex]Na_2CO_3+CaCl_2----- > CaCO_3+2NaCl[/tex]
How precipitates are formed?Formation of an insoluble compound will sometimes occur when a solution containing a particular cation (a positively charged ion) is mixed with another solution containing a particular anion (a negatively charged ion). The solid that separates is called a precipitate.
Thus, out of the given options the option c will form a precipitate when sodium carbonate reacts with calcium chloride, calcium carbonate will form with a salt sodium chloride.
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What is the volume, in liters, occupied by 1.73 moles of N2 gas at 0.992 atm pressure and a temperature of 75º C? (R value- 0.08206)
48.70 is the volume, in liters, occupied by 1.73 moles of Nitrogen gas at 0.992 atm pressure and a temperature of 75º C.
Explanation:
Data given:
number of moles of nitrogen gas = 1.73 moles
pressure of the gas = 0.992 atm
temperature of the gas = 75 degrees or 273.25 + 75 = 348.15 K
R (gas constant) = 0.08206 L atm/molesK
volume of the nitrogen gas under these conditions =?
The formula used is of ideal Gas Law:
PV = nRT
Rearranging the equation to get,
V = [tex]\frac{nRT}{P}[/tex]
putting the values in the equation:
V = [tex]\frac{1.73 X 0.08026 X 348.15}{0.992}[/tex]
= 48.70 Litres
the volume of the gas is 48.70 litres from the standard values used in the equation.
The volume, in liters, occupied by 1.73 moles of N₂ gas at 0.992 atm pressure and a temperature of 75º C is: [tex]45.81 \text{ L}.[/tex]
The volume occupied by the N₂ gas can be calculated using the ideal gas law, which is given by the equation:
[tex]\[ PV = nRT \][/tex]
where:
- [tex]\( P \)[/tex] is the pressure of the gas,
- [tex]\( V \)[/tex] is the volume of the gas,
- [tex]\( n \)[/tex] is the number of moles of the gas,
- [tex]\( R \)[/tex] is the ideal gas constant, and
- [tex]\( T \)[/tex] is the temperature of the gas in Kelvin.
Given:
- [tex]\( n = 1.73 \)[/tex] moles,
- [tex]\( P = 0.992 \)[/tex] atm,
- [tex]\( T = 75^\circ C \)[/tex], which needs to be converted to Kelvin by adding 273.15 to the Celsius temperature,
- [tex]\( R = 0.08206 \) L\atm/(mol\K).[/tex]
First, convert the temperature from Celsius to Kelvin:
[tex]\[ T(K) = T(^\circ C) + 273.15 = 75 + 273.15 = 348.15 \text{ K} \][/tex]
Now, rearrange the ideal gas law to solve for the volume [tex]\( V \)[/tex]:
[tex]\[ V = \frac{nRT}{P} \][/tex]
Substitute the given values into the equation:
[tex]\[ V = \frac{(1.73 \text{ mol})(0.08206 \text{ L\·atm/(mol\·K)})(348.15 \text{ K})}{0.992 \text{ atm}} \][/tex]
[tex]\[ V = \frac{(1.73)(0.08206)(348.15)}{0.992} \][/tex]
[tex]\[ V = \frac{45.460298}{0.992} \][/tex]
[tex]\[ V \approx 45.81 \text{ L} \][/tex]
Therefore, the volume occupied by 1.73 moles of N2 gas at 0.992 atm pressure and a temperature of 75º C is approximately 45.81 liters.
1. The solubility of lead(II) chloride at some high temperature is 3.1 x 10-2 M. Find the Ksp of PbCl2 at this temperature.
2. The Ksp of Al(OH)3 is 1.0 x 10-33. What is the solubility of Al(OH)3 in 0.000010 M Al(NO3)3?
3. A precipitate of lead(II) chloride forms when 3.5 mg of NaCl is dissolved in 0.250 L of 0.12 M lead(II)nitrate.
A. True
B. False
Answer:
1) The solubility product of the lead(II) chloride is [tex]1.2\times 10^{-4}[/tex].
2) The solubility of the aluminium hydroxide is [tex]1.6\times 10^{-10} M[/tex].
3)The given statement is false.
Explanation:
1)
Solubility of lead chloride = [tex]S=3.1\times 10^-2M[/tex]
[tex]PbCl_2(aq)\rightleftharpoons Pb^{2+}(aq)+2Cl^-(aq)[/tex]
S 2S
The solubility product of the lead(II) chloride = [tex]K_{sp}[/tex]
[tex]K_{sp}=[Pb^{2+}][Cl^-]^2[/tex]
[tex]K_{sp}=S\times (2S)^2=4S^3=4\times (3.1\times 10^{-2})^3=1.2\times 10^{-4}[/tex]
The solubility product of the lead(II) chloride is [tex]1.2\times 10^{-4}[/tex].
2)
Concentration of aluminium nitrate = 0.000010 M
Concentration of aluminum ion =[tex]1\timed 0.000010 M=0.000010 M[/tex]
Solubility of aluminium hydroxide in aluminum nitrate solution = [tex]S[/tex]
[tex]Al(OH)_3(aq)\rightleftharpoons Al^{3+}(aq)+3OH^-(aq)[/tex]
S 3S
The solubility product of the aluminium nitrate = [tex]K_{sp}=1.0\times 10^{-33}[/tex]
[tex]K_{sp}=[Al^{3+}][OH^-]^3[/tex]
[tex]1.0\times 10^{-33}=(0.000010+S)\times (3S)^3[/tex]
[tex]S=1.6\times 10^{-10} M[/tex]
The solubility of the aluminium hydroxide is [tex]1.6\times 10^{-10} M[/tex].
3.
[tex]Molarity=\frac{Moles}{Volume (L)}[/tex]
Mass of NaCl= 3.5 mg = 0.0035 g
1 mg = 0.001 g
Moles of NaCl = [tex]\frac{0.0035 g}{58.5 g/mol}=6.0\times 10^{-5} mol[/tex]
Volume of the solution = 0.250 L
[tex][NaCl]=\frac{6.0\times 10^{-5} mol}{0.250 L}=0.00024 M[/tex]
1 mole of NaCl gives 1 mole of sodium ion and 1 mole of chloride ions.
[tex][Cl^-]=[NaCl]=0.00024 M[/tex]
Moles of lead (II) nitrate = n
Volume of the solution = 0.250 L
Molarity lead(II) nitrate = 0.12 M
[tex]n=0.12 M]\times 0.250 L=0.030 mol[/tex]
1 mole of lead nitrate gives 1 mole of lead (II) ion and 2 moles of nitrate ions.
[tex][Pb^{2+}]=[Pb(NO_2)_3]=0.030 M[/tex]
[tex]PbCl_2(aq)\rightleftharpoons Pb^{2+}(aq)+2Cl^-(aq)[/tex]
Solubility of lead(II) chloride = [tex]K_{sp}=1.2\times 10^{-4}[/tex]
Ionic product of the lead chloride in solution :
[tex]Q_i=[Pb^{2+}][Cl^-]^2=0.030 M\times (0.00024 M)^2=1.7\times 10^{-9}[/tex]
[tex]Q_i<K_{sp}[/tex] ( no precipitation)
The given statement is false.
The Ksp of PbCl2 at a given temperature is calculated using the solubility of the compound. For Al(OH)3 in a solution containing Al(NO3)3, the solubility would be influenced by the common ion effect. The potential formation of a PbCl2 precipitate depends on the concentrations of lead(II) and chloride ions.
Explanation:Calculation of Ksp and Solubility
The solubility product (Ksp) represents the equilibrium between a solid and its corresponding ions in a solution. It is a unique value for each soluble compound at a given temperature.
1. Ksp of PbCl2
The dissolution of PbCl2 can be written as:
PbCl2(s) ⇌ Pb2+(aq) + 2Cl-(aq)
Given the solubility of PbCl2 is 3.1 x 10-2 M, we can deduce the concentration of Pb2+ is 3.1 x 10-2 M and Cl- is 2 x 3.1 x 10-2 M. Thus, the Ksp can be calculated using the formula:
Ksp = [Pb2+][Cl-]2 = (3.1 x 10-2) x (2 x 3.1 x 10-2)2 = 5.88 x 10-5
2. Solubility of Al(OH)3 in Al(NO3)3 Solution
Given the Ksp of Al(OH)3 is 1.0 x 10-33, and the initial concentration of Al3+ from Al(NO3)3 is known, we need to account for the common ion effect which will reduce the solubility of Al(OH)3. This complex calculation would require additional steps to accurately account for the common ion.
3. Formation of PbCl2 Precipitate
NaCl dissociates to give Cl- ions and the Pb2+ from Pb(NO3)2 can form PbCl2, depending on the product of their concentrations relative to the Ksp of PbCl2. This assessment involves comparing the ionic product to the Ksp to determine if a precipitate will form.
When the equation below is correctly balanced, the coefficient for CO2 is
Answer:
The answer to your question is 4
Explanation:
Chemical reaction
C₂H₆ + O₂ ⇒ CO₂ + H₂O
Reactants Elements Products
2 Carbon 1
6 Hydrogen 2
2 Oxygen 3
Balanced chemical reaction
2C₂H₆ + 7O₂ ⇒ 4CO₂ + 6H₂O
Reactants Elements Products
4 Carbon 4
12 Hydrogen 12
14 Oxygen 14
When the reaction is balanced the coefficient for CO₂ is 4.
A weather balloon is filled with helium that occupies a volume of 500 L at 0.995 atm and 32.0 ℃. After it is released, it rises to a location where the pressure is 0.720 atm and the temperature is -12 ℃. What is the volume of the balloon at the new location?
Answer : The volume of the balloon at the new location is, 591.3 L
Explanation :
Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.
The combined gas equation is,
[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas = 0.995 atm
[tex]P_2[/tex] = final pressure of gas = 0.720 atm
[tex]V_1[/tex] = initial volume of gas = 500 L
[tex]V_2[/tex] = final volume of gas = ?
[tex]T_1[/tex] = initial temperature of gas = [tex]32.0^oC=273+32=305K[/tex]
[tex]T_2[/tex] = final temperature of gas = [tex]-12^oC=273+(-12)=261K[/tex]
Now put all the given values in the above equation, we get:
[tex]\frac{0.995atm\times 500L}{305K}=\frac{0.720atm\times V_2}{261K}[/tex]
[tex]V_2=591.3L[/tex]
Therefore, the volume of the balloon at the new location is, 591.3 L
which one of these elements was suggested as transition element by Mendeleev?
(a) N
(b)Ni
(c)Ne
(d)none
PLZ ANSWER SOOON
I'LL MARK YOU AS BRAINLIEST
Answer:
The answer is I think None.
Scientists have created an exact scale replica of a rover currently found on Mars and a miniature 3D landscape identical to that where the rover is currently located. Before sending the rover over the treacherous Martian landscape, they wish to try their model rover first. Which features make this a good model for the scientists to use?
A. It is simplified to leave out details, which makes it easier to understand.
B. It is based on sound scientific principles.
C. It can be used to make predictions.
D. It can be analyzed and shown to be reliable or un-reliable.
The scale model of the Mars rover and landscape is a good model as it is based on scientific principles, can make predictions, and be analyzed for reliability.
Explanation:This rover model created by the scientists has several factors that make it a good model for the Martian landscape. B. It is based on sound scientific principles: This model is created using scientific facts and principles about the Mars terrain and the rover itself, ensuring it is a legitimate representation of the actual conditions on Mars. C. It can be used to make predictions: The scientists can use this model to test different circumstances and see how the rover would behave, allowing them to predict any problems that might be encountered on the actual planet. D. It can be analyzed and shown to be reliable or un-reliable: After running tests, the model's representation of reality can be assessed. If it accurately predicts the rover's action in the real Martian environment, it can be considered reliable. If not, it is seen as unreliable.
Learn more about Modeling and Prediction here:https://brainly.com/question/37982268
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The molecular weight of hemoglobin is 64,500 daltons (= g mol-1).
a. how much oxygen can be bound per g of hemoglobin? express the values as ml per g of hemoglobin, where ml is the volume of o2. r =0.082 l atm mol-1 ok-1, ok =273 + oc. the molar volume of o2 is given as v = nrt/p where p = 1 atm and n= 1 mol; (hint: 1.0 mol x 0.082 l atm mol-1 ok-1 x 273.2 ok / 1 atm = 22.4 l mol-1)
Answer:
Thus, one gram of Hemoglobin carries 1.389 mL of oxygen.
Explanation:
Each hemoglobin molecules carries 4 oxygen molecules.
Given that the molar mass of hemoglobin = 64,5000 g/mol
1 gram of hemoglobin = [tex]\frac{1}{64500}moles[/tex]
Now, no of moles of oxygen carried in 1 mole of hemoglobin = [tex]\frac{1}{64500}* 4 \ \ moles[/tex]
= [tex]6.2016*10^{-5}[/tex] moles
assuming the oxygen is to be an ideal gas; then:
PV = nRT
[tex]V =\frac{nRT}{P}[/tex]
Given that :
[tex]\frac{RT}{P}= 22.4 \ L/mol[/tex]
Then V = [tex]6.2016*10^{-5}[/tex] [tex]*22.4 *1000 \ mol[/tex]
V = 1.389 mL
Thus, one gram of Hemoglobin carries 1.389 mL of oxygen.
Which has the most thermal energy?
A cup of water at 10°C or a lake at 10°C
Answer:
A lake because it has more mass
Answer:
A lake at 10 degrees C
Explanation: Got it right on Edge 2020