Answer:
When an alkane undergoes a halogenation reaction, the majority of the products will add the halogen to the most substituted and most stable carbon. In this case, this would likely be the third carbon (middle).
Key:
Leftmost molecule = C₅H₁₂
Rightmost molecule = C₅H₁₁Cl
*Not pictured = HCl (another product)
pls help i need this ASAP
Answer:
a. 54 calories burnt
b. multiplied by 9
For each pair of molecules given in the table below, identify the correct relationship.
For each pair of molecules given in the table below, the correct relationships are identified as follows.
The relationships between the molecules are given as?These are structural isomers. This is because, they have the same molecular formula (C₆H₁₂) but possess varying structures.The given pair of molecules posses similar formula (C₄H₁₀O) and can be superimposed on one another via rotation of the entire molecule, hence they are identical isomers.In this case the pair of molecules possess similar molecular formula (C₄H₁₀O) and similar arrangement of atoms. Hence, they are identical isomers.This case also features structural isomers. They both contain the same carbon chain with similar formula - C₃H₆BrClThese pair as identical isomers. They are also derived from C₃H₆BrCl.This pair are called stereoisomers isomers. This is because they contain the same about of molecules but are different in the position of the alcohol (-OH) group. But more importantly, the position of the bonding is the same.This set is a functional pair. This is because the composition of the molecules present in each case are different.This is also a functional pair.What is a molecules?A molecule is a bonded collection of atoms that represents the smallest fundamental unit of a chemical compound that may participate in a chemical process.
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7. An SDS sheet contains the abbreviations LC or LD. The L portion of these two-letter
combinations stands for
A. life.
O B. liquid.
C. lethal.
D. layered.
How much heat is required to raise the temperature of 67.0 g of water from its melting point to its boiling point?
When 67 g of water is heated from its melting point to its boiling point, it takes 28006 J of heat.
Relationship between heat production and temperature changeA way to numerically relate the quantity of thermal energy acquired (or lost) by a sample of any substance to that sample's mass and the temperature change that results from that is provided by specific heat capacity.The following formula is frequently used to describe the connection between these four values.
q = msΔT
where, q = the amount of heat emitted or absorbed by the thing
m = the object's mass = 67 gm
s = a specific heat capacity of the substance = 4.18 J/gC
ΔT = the resultant change in the object's temperature = 373.15 -273.15K= 100 k
q = 67 * 4.18 * 100 J
⇒q = 28006 J
Therefore it is concluded that 67 g of water takes 28006 J of heat from its melting point to reach its boiling point.
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1. A 4.0-g sample of glass was heated from 274K to 314 K. a temperature increase of 40 K, and was
found to have absorbed 32J of energy as heat.
a. What is the specific heat of this type of glass?
b. How much energy will the same glass sample gain when it is heated from 314 K to 344 K?
Answer:
See below
Explanation:
Q = m c T c = specific heat T = temp change Q = heat joules
32 = 4 c 40 c = .2 J/g-C
314 to 344 k is a change of 30 K
Q = m c T
= 4 * .2 * 30 = 24 Joules
Answer:
(a) 0.2 J/g°K
(b) 24 J
Explanation:
(a)
To find the specific heat capacity, you need to use the following equation:
Q = mcΔT
In this formula,
-----> Q = heat energy (J)
-----> m = mass (g)
-----> c = specific heat capacity (J/g°K)
-----> ΔT = change in temperature (K)
You can plug the given values into the equations and simplify to find the missing value.
Q = 32 J c = ? J/g°K
m = 4.0 g ΔT = 40 K
Q = mcΔT <----- Equation
32 J = (4.0 g) x c x (40 K) <----- Insert variables
32 J = (160) x c <----- Multiply 4.0 and 40
0.2 = c <----- Divide both sides by 160
(b)
To find the energy of the same sample, you can use the same equation. This time, you know the specific heat capacity, have a different change in temperature, and are solving for energy (Q).
Q = ? J c = 0.2 J/g°K
m = 4.0 g ΔT = 344 K - 314 K = 30 K
Q = mcΔT <----- Given equation
Q = (4.0 g)(0.2 J/g°K)(30 K) <----- Insert values
Q = 24 <----- Multiply
What are the coefficients needed to balance this equation: NH3 +0₂ → N₂ + H₂O?
Answer:
4 NH₃ + 3 O₂ -----> 2 N₂ + 6 H₂O
Explanation:
An equation is balanced when there is an equal amount of each element on both sides of a reaction. To balance the elements, you can add coefficients to modify the amount of elements/molecules present. It is important to have the smallest coefficients possible.
The unbalanced equation:
NH₃ + O₂ -----> N₂ + H₂O
Reactants: 1 nitrogen, 3 hydrogen, 2 oxygen
Products: 2 nitrogen, 2 hydrogen, 1 oxygen
The balanced equation:
4 NH₃ + 3 O₂ -----> 2 N₂ + 6 H₂O
Reactants: 4 nitrogen, 12 hydrogen, 6 oxygen
Products: 4 nitrogen, 12 hydrogen, 6 oxygen
The value of the entropy change for the process N₂ (g) + 3H₂ (g) --> 2NH₃ (g) is ________.
negative
positive
unchanged
zero
The entropy change will be negative because the number of particles in the system decreased from left to right.
What is the entropy change?The term entropy refers to the degree of disorder in a system. We know that the production of gases would lead to an increase in the entropy of the system.
Now given the equation; N₂ (g) + 3H₂ (g) --> 2NH₃ (g), the entropy change will be negative because the number of particles in the system decreased from left to right.
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Which statement can best be concluded from the ideal gas law?
O The product of pressuré and volume of an ideal gas is proportional to the absolute temperature.
O All collisions between atoms or molecules
are perfectly elastic and are not the result of any attractive forces.
O The temperature, pressure, and volume of a gas are all related.
O The behavior of a gas
under real conditions does not obey the ideal gas law.
The product of pressuré and volume of an ideal gas is proportional to the absolute temperature.
What is an ideal gas?An ideal gas is a gas that is not real in nature. It is a hypothetical gas that obeys the ideal gas law.
Just like normal gas particles, the particles of an ideal gas also move randomly. However, unlike normal gas molecules, the molecules of an ideal gas do not interact with one another.
The ideal gas law states that the product of the pressure and the volume of a gas is proportional to the temperature of the gas.
Mathematically, the ideal gas equation is expressed as:
PV = nRT where n = number of mole of the gas and R = constant.
Thus, the best conclusion from the ideal gas law is the product of pressure and volume is directly proportional to the temperature.
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Order the following chemicals from lowest to highest melting point.
Tungsten
Copper (II) chloride
• Caffeine
• Lead
• Sodium chloride
• Silver
Caffeine - Lead (Pb) - Copper (II) chloride (CuCl2) - Sodium chloride (NaCl) - Silver (Ag) - Tungsten
What is the pressure in a 5.00 L tank with
7.10 moles of oxygen at 39.3 °C?
Answer:
36.4 atm
Explanation:
To find the pressure, you need to use the Ideal Gas Law. The equation looks like this:
PV = nRT
In this equation,
-----> P = pressure (atm)
-----> V = volume (L)
-----> n = moles
-----> R = constant (0.0821 L*atm/mol*K)
-----> T = temperature (K)
Before you can plug the given values into the equation, you first need to convert Celsius to Kelvin.
P = ? atm R = 0.0821 L*atm/mol*K
V = 5.00 L T = 393 °C + 273.15 = 312.45 K
n = 7.10 moles
PV = nRT
P(5.00 L) = (7.10 moles)(0.0821 L*atm/mol*K)(312.45 K)
P(5.00 L) = 182.130
P = 36.4 atm
What color does red cabbage juice make when mixed with a dishwasher soap?
Answer:
Blue or green
Explanation:
A chemical called anthocyanin is in red cabbage juice, which changes color depending on the pH of its environment. Dishwasher soap is usually alkaline, making the juice turn a blue-green color.
What is the initial volume, in milliliters, needed to prepare each of the following diluted solutions? 330mL of 7.5% (m/v) HCl from 17% (m/v) HCl
Taking into account the definition of dilution, the initial volume needed to prepare each of the diluted solution is 145.59 mL.
DilutionWhen it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.
Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volumeFinal volumeIn this case, you know:
Ci= 17% (m/v)Vi= ?Cf= 7.5% (m/v)Vf= 330 mLReplacing in the definition of dilution:
17% (m/v)× Vi= 7.5% (m/v)× 330 mL
Solving:
Vi= (7.5% (m/v)× 330 mL)÷ 17% (m/v)
Vi= 145.59 mL
In summary, the initial volume needed to prepare each of the diluted solution is 145.59 mL.
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What mass of water could be warmed from 21.4 degrees celsius to 43.4 degrees celsius by the pellet dropped inside it? Heat capacity of the pellet is 56 J/degrees celsius. the pellet is initially at 113 degrees celsius.
42.34 g of water could be warmed from 21.4°C to 43.4°C by the pellet dropped inside it
Heat loss by the pellet is equal to the Heat gained by the water.
[tex]q_{w} = -q_{p}[/tex] ….(1)
where, [tex]q_{w}[/tex] is the heat gained by water
[tex]q_{p}[/tex] is the heat loss by pellet
[tex]q_{w}[/tex] = mCΔT
where m = mass of water
C = specific heat capacity of water = 4.184 J/g-°C
ΔT = Increase in temperature
ΔT for water = 43.4 - 21.4 = 22°C
[tex]q_{w}[/tex] = m × 4.184 × 22 …. (2)
Now
[tex]q_{p}[/tex] = [tex]H_{c}[/tex] ×ΔT
where [tex]H_{c}[/tex] = Heat capacity of pellet = 56J/°C
Δ T for pellet = 43.4 - 113 =- 69.6°C
[tex]q_{p}[/tex] = 56 × -69.6 = -3897.6 J
From equation (1) and (2)
-m× 4.184 × 22 =-3897.6
m= 42.34 g
Hence, 42.34 g of water could be warmed from 21.4 degrees Celsius to 43.4 degrees Celsius by the pellet dropped inside it.
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PLEASE HELP!!!
A sample of xenon occupies a volume of 715 mL at 8.01 atm and 67 °C. If the volume is changed to 963 mL and the temperature is changed to 52 °C, what will
be the new pressure?
Answer:
4.62 atm
Explanation:
To find the missing pressure, you need to use the Combined Gas Law equation:
P₁V₁ / T₁ = P₂V₂ / T₂
In this equation, "P₁", "V₁", and "T₁" represent the initial pressure, volume, and temperature. "P₂", "V₂", and "T₂" represent the final pressure, volume, and temperature.
P₁ = 8.01 atm P₁ = ? atm
V₁ = 715 mL V₁ = 963 mL
T₁ = 67 °C T₁ = 52 °C
P₁V₁ / T₁ = P₂V₂ / T₂
(8.01 atm)(715 mL) / 67 °C = P₂(963 mL) / 52 °C
85.47985 = P₂(963 mL) / 52 °C
4444.952 = P₂(936 mL)
4.62 atm = P₂
When ATP breaks down to ADP, potential energy stored in bonds is released. This energy stored in bonds is
first law of thermodynamics with pressure volume equation
The first law of thermodynamics with pressure volume equation is written as E = Q - PΔV.
What is first law of thermodynamics?The first law of thermodynamics states that energy cannot be created or destroyed, but it can be transformed from one form to another.
It also states that the internal energy (E) is equal to the difference of the heat transfer (Q) into a system and the work (W) done by the system.
E = Q - W
The first law of thermodynamics with pressure volume equation is given as;
W = PΔV
E = Q - PΔV
Thus, the first law of thermodynamics with pressure volume equation is written as E = Q - PΔV.
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which celsius temperature is equal to 298k
Answer:
298-273 = 25°C is correct answer!
2NaN3 → 2Na + 3N2. Calculate the mass of sodium azide required to decompose and produce the number of moles of nitrogen you calculated to get 0.016
The mass of sodium azide required to decompose and produce the number of moles of nitrogen calculated to get 0.016 is 0.011moles.
How to calculate number of moles?The number of moles of a substance can be calculated stoichiometrically as follows:
According to this question, sodium azide decomposes to produce sodium and nitrogen gas as follows:
2NaN3 → 2Na + 3N2
2 moles of sodium azide produces 3 moles of N2
This means that 0.016 moles of N2 will be produced by 0.016 × 2/3 = 0.011moles of NaN3.
Therefore, the mass of sodium azide required to decompose and produce the number of moles of nitrogen calculated to get 0.016 is 0.011moles.
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Name the functional group in the
following molecule:
A. alkene
C. aldehyde
O₂N
NO₂
-CH₂
NO₂
B. aromatic
D. alkyl halide
The functional group would be the aromatic ring.
What are functional groups?Functional groups in organic compounds are a group of atoms that gives the compound a distinctive chemical property or properties.
The major functional groups include Hydroxyl, sulfhydryl, carbonyl, carboxyl, amino, and phosphate groups. Aromatic rings are also considered a functional group.
Functional groups are made up of atoms of elements that are covalently linked to each other. The functional group as a whole is also covalently linked to the rest of the molecule.
Functional groups influence molecules to behave in a particular way when it comes to chemical reactions.
Looking at the image (see the attached), none of the side chains qualify as functional groups except the mother chain which is an aromatic ring.
Thus, the only functional group remains the aromatic ring.
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What would the hydroxide ion concentration be if the hydrogen ion concentration was 1 x 10-3 M?
Taking into account the definition of pH and pOH, the hydroxide ion concentration will be 1×10⁻¹¹ M.
Definition of pHpH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.
The pH is defined as the negative base 10 logarithm of the activity of hydrogen ions, that is, the concentration of hydrogen ions or H₃O⁺:
pH= - log [H⁺]= - log [H₃O⁺]
Definition of pOHSimilarly, pOH is a measure of hydroxyl ions in a solution and is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:
pOH= - log [OH⁻]
Relationship between pH and pOHThe following relationship can be established between pH and pOH:
pOH + pH= 14
Hydroxide ion concentrationA solution had a hydrogen ion concentration of 1×10⁻³ M. In other words [H⁺]= 1×10⁻³ M.
Replacing in the definition of pH, it is calculated as:
pH= - log (1×10⁻³ M)
Solving;
pH= 3
Replacing in the relationship established between pH and pOH, the pOH can be calculated as:
pOH + 3= 14
Solving:
pOH= 14 - 3
pOH= 11
Replacing in the definition of pOH the concentration of OH⁻ ions is obtained:
- log [OH⁻]= 11
Solving:
[OH⁻]= 10⁻¹¹
[OH⁻]= 1×10⁻¹¹ M
In summary, the hydroxide ion concentration will be 1×10⁻¹¹ M.
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4.50 moles of glucose in 3.50 L of a glucose solution
Answer:
Molarity = 1.28
Explanation:
[tex]m= n/v[/tex]
M = molar concentration
n = moles of solute
v = liters of solution
Molarity = moles of solute / litres of solution.
]
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A student mixed two clear liquids together in a beaker. A solid and a new liquid formed. The student forgot to write down the mass of one of the reactants. The rest of the data are shown in the table below.
Mass (g)
liquid reactant A unknown
liquid reactant B 9.0
liquid product 8.0
solid product 12.0
What is the mass of liquid reactant A?
A. 1.0 g
B. 8.0 g
C. 9.0 g
D. 11.0 g
E. 20.0 g
9 / 15
8 of 15 Answered
Mass of liquid reactant A is 11g.
as we know that,
reactant = product
from conservation of mass
so, liquid reactant A + liquid reactant B = liquid product + solid product
substituting the values, we get,
liquid reactant A + 9 = 8 + 12
liquid reactant A + 9 = 20
liquid reactant A = 20 - 9
liquid reactant A = 11g
Hence, mass of the liquid reactant A is 11g.
what is a reactant ?
A reagent, also known as an analytical reagent, is a substance or compound that is added to a system in chemistry to bring about a chemical reaction or check to see whether one happens. Although the terms "reagent" and "reactant" are frequently used synonymously, "reactant" refers to a material that is consumed during a chemical reaction.
Mass of liquid reactant A is 11g.
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27.2 kg of a solution containing 18.7 % KCl by mass
Express your answer in kilograms using three significant figures.
The amount of potassium chloride (KCl) in 27.2 kg of a solution containing 18.7% KCl by mass solution is 5.086 kg.
How to find the mass of solute ?Mass of solute = Mass percent of solute x Mass of the solution
Here,
Mass percent of solute = 18.7 %
Mass of the solution = 27.2 kg
Now put the value in above formula we get
Mass of solute = Mass percent of solute x Mass of the solution
= [tex]\frac{18.7}{100} \times 27.2\ kg[/tex]
= [tex]\frac{508.64}{100}[/tex]
= 5.086
Thus from the above conclusion we can say that The amount of potassium chloride (KCl) in 27.2 kg of a solution containing 18.7% KCl by mass solution is 5.086 kg.
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The volume of a sample of gas (4.32 g) was 752 mL at 1.98 ATM and 62°C. The gas is
Answer:
Bromine
Explanation:
To identify the gas, you first need to find the moles of the gas. You can do this using the Ideal Gas Law:
PV = nRT
In this equation,
-----> P = pressure (atm)
-----> V = volume (L)
-----> n = moles
-----> R = Ideal Gas Constant (0.08206 atm*L/mol *K)
-----> T = temperature (K)
After converting mL to L and Celsius to Kelvin, you can plug the values into the equation and simplify to find the moles.
P = 1.98 atm R = 0.08206 atm*L/mol *K
V = 752 mL / 1,000 = 0.752 L T = 62 °C + 273.15 = 335.15 K
n = ? moles
PV = nRT
(1.98 atm)(0.752 L) = n(0.08206 atm*L/mol *K)(335.15 K)
1.48896 = n(27.5024)
0.0541 = n
You can identify the gas by determining the molar mass of the gas, which is specific to each element. The molar mass exists as a ratio that compares the mass per 1 mole.
Molar Mass = mass / moles
Molar Mass = 4.32 g / 0.0541 moles
Molar Mass = 79.8 g/mol
This molar mass is closest to the molar mass of bromine (79.904 g/mol).
PLS SOMEONE HELP ITS 1:30 IN THE MORNING
Balancing equations maintains the law of conservation of mass because the process shows how chemical reactions ____(a)______ and ____(b)______ with the same particles.
Answer:
reactants and products
Explanation:
According to law of conservation of mass
In a chemical reaction
Mass is neither created nor endorsedSo by balancing equation we fulfil this law
Answer:
oxidation-reduction reaction, also called redox reaction, any chemical reaction in which the oxidation number of a participating chemical species changes. The term covers a large and diverse body of processes.
will mark brilliant pls help question is above
Answer:
a.) The garden plants provide energy to all the other organisms. While not every organism consumes garden plants directly, every organism's food lineage can be traced to garden plants. For instance, while ground beetles do not directly consume garden plants, they do eat snails, and snails eat garden plants.
b.) The slug population might increase is the aphid population decreased because there would be less competition for food resources. Both populations consume garden plants, and there is only a finite number of garden plants. Therefore, there is a limit that each population can consume. If there were less aphids eating the garden plants, there would be more left for the slugs. Less starving slugs would lead to greater reproduction and thus a higher slug population.
A soil test recommends applying 193 lbs N per acre. Using a 36-6-18 fertilizer, how much fertilizer is needed to meet the recommendation? Round your answer to nearest whole number.
The mass of 36-6-18 fertilizer fertilizer required is 536 lb.
What mass of nitrogen fertilizer is required for the acre of land?The mass of nitrogen fertilizer required for the acre of land is determined as follows:
Percentage of Nitrogen in the fertilizer = 36% by weight of the fertilizer.
Mass of Nitrogen required per acre = 193 lbs
Mass of fertilizer required = 193 * 100/36
Mass of fertilizer required = 536 lb of fertilizer.
In conclusion, the amount of fertilizer required is determined from the percent of nitrogen in the fertilizer.
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Chemical reaction when chromium metal is immersed in an aqueous solution of cobalt(II)
The chemical equation for the reaction is [tex]2Cr (s) + 3CoCl_2 (aq) --- > 2CrCl_3 (aq) + 3Co (s)[/tex]
Chemical reactionChromium metal is higher in the reactivity series than cobalt. Thus, chromium will displace cobalt from solutions.
Therefore, the equation for the reaction between chromium metal and cobalt (II) chloride will be written as:
[tex]2Cr (s) + 3CoCl_2 (aq) --- > 2CrCl_3 (aq) + 3Co (s)[/tex]
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Chromium metal is immersed in an aqueous solution of cobalt(II) chloride. Express your answer as a chemical equation. Identify all of the phases in your answer. Enter no reaction if no reaction occurs.
9. Predict the full Robinson Annulation product (including all intermediates) and 10. Show the stepwise mechanism for the following reaction.
Part A
How much heat is required to convert 4.88 g of ice at-14.0°C to water at 23.0°C? (The heat capacity of ice is 2.09 J/(g- "C). AHp (H₂O) = 40.7 kJ/mol, and AH (H₂O) = 6.02 kJ/mol.)
Express your answer with the appropriate units.
?
Taking into account the definition of calorimetry, sensible heat and latent heat, the amount of heat required is 2.243974 kJ or 2,243.974 J.
Definition of calorimetry, sensible heat and latent heatCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
Latent heat is defined as the energy required by a quantity of substance to change state.
When this change consists of changing from a solid to a liquid phase, it is called heat of fusion and when the change occurs from a liquid to a gaseous state, it is called heat of vaporization.
-14 °C to 0°CIn firts place, you know that the melting point is 0°C. So, first of all you must increase the temperature from -14 ° C (in solid state) to 0 ° C, in order to supply heat without changing state (sensible heat).
The amount of heat a body receives or transmits is determined by:
Q = c× m× ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
In this case, you know:
c(solid)= heat capacity of ice= 2.09 [tex]\frac{J}{gC}[/tex]m= 4.88 gΔT= Tfinal - Tinitial= 0 °C - (-14) °C= 14 °CReplacing:
Q1= 2.09 [tex]\frac{J}{gC}[/tex] × 4.88 g× 14 °C
Solving:
Q1=142.7888 J= 0.1427888 kJ
Change of stateThe heat Q that is necessary to provide for a mass m of a certain substance to change phase is equal to
Q = m×L
where L is called the latent heat of the substance and depends on the type of phase change.
In this case, you know:
n= 4.88 g×[tex]\frac{1 mole}{18 g}[/tex] = 0.2711 moles, where 18 [tex]\frac{g}{mole}[/tex] is the molar mass of H₂O, that is, the amount of mass that a substance contains in one mole.ΔHfus= 6.02 [tex]\frac{kJ}{mol}[/tex]Replacing:
Q2= 0.2711 moles×6.02 [tex]\frac{kJ}{mol}[/tex]
Solving:
Q2= 1.632022 kJ
0 °C to 23 °CSimilar to sensible heat previously calculated, you know:
c(liquid)= specific heat of water= 4.18[tex]\frac{J}{gC}[/tex]m= 4.88 gΔT= Tfinal - Tinitial= 23 °C - 0 °C= 23 °CReplacing:
Q3= 4.18[tex]\frac{J}{gC}[/tex] × 4.88 g× 23 °C
Solving:
Q3= 469.1632 J= 0.4691632 kJ
Total heat requiredThe total heat required is calculated as:
Total heat required= 0.1427888 kJ + 1.632022 kJ + 0.4691632 kJ
Total heat required= 2.243974 kJ= 2,243.974 J
In summary, the amount of heat required is 2.243974 kJ or 2,243.974 J.
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