Answer:
a. 3.79e5 J
b. Decrease.
Explanation:
Hello!
a. In this case, since the heat involved during a compression-expansion isothermal process is computed via:
[tex]Q=nRTln(\frac{V_2}{V_1} )[/tex]
Now, since the final volume is one third of the initial one:
[tex]V_2=\frac{V_1}{3}[/tex]
So we can plug in now:
[tex]Q=139mol*8.3145\frac{J}{mol*K}*298.15K*ln(\frac{\frac{V_1}{3} }{V_1} )\\\\Q=-3.79x10^5J[/tex]
b. In this case, the relationship between initial and final volume is:
[tex]V_2=2.2V_1[/tex]
So the heat interaction is now:
[tex]Q=139mol*8.3145\frac{J}{mol*K}*298.15K*ln(\frac{2.2V_1 }{V_1} )\\\\Q=2.72x10^5J[/tex]
It means that the heat interaction decrease on the contrary process, it means that in a. heat was released by 3.79e5 J and in b heat is absorbed by 2.72e5 J.
Best regards!
If 1.0 volumes of 1.0 M solutions of sodium hydroxide and lead (II) nitrate are mized how many moles of product are produced
Answer:
0.5 moles of Pb(OH)₂ are produced.
Explanation:
The reaction is:
[tex]2NaOH + Pb(NO_{3})_{2} \rightarrow Pb(OH)_{2} + 2 NaNO_{3}[/tex]
If we have 1.0 liter of 1.0 M of sodium hydroxide and lead (II) nitrate, the number of moles are:
[tex] n_{NaOH} = C*V = 1 M*1 L = 1 mol [/tex]
[tex] n_{Pb(NO_{3})_{2}} = C*V = 1 M*1 L = 1 mol [/tex]
Now, we need to find the limiting reactant knowing that 2 moles of sodium hydroxide react with 1 mol of lead (II) nitrate:
[tex] n_{NaOH} = \frac{2 moles_{NaOH}}{1 mol Pb(NO_{3})_{2}}* 1 mol Pb(NO_{3})_{2} = 2 moles [/tex]
Since we have 1 mol of sodium hydroxide and we need 2 moles to react with lead (II) nitrate, then the limiting reactant is sodium hydroxide.
We can find the number of moles of lead (II) hydroxide produced as follows:
[tex] n_{Pb(OH)_{2}} = \frac{1 mol Pb(OH)_{2}}{2 mol NaOH}*1 mol NaOH = 0.5 mol [/tex]
Therefore, 0.5 moles of Pb(OH)₂ are produced.
I hope it helps you!
Discuss between renewable and nonrenewable resources .Give an example for each.
Answer:
demos los
Explanation:
Answer: Renewable resources can be used again and again. Non-Renewable resources can be used once
Explanation: Sunlight, water, wind, are the renewable resources
Petrol, coal, natural gas are examples of non-renewable resources.
Help please!
Describe Bohr’s model of the hydrogen atom
Explanation:
Bohr's model of the hydrogen atom is based on three postulates: (1) an electron moves around the nucleus in a circular orbit, (2) an electron's angular momentum in the orbit is quantized, and (3) the change in an electron's energy
A 488.3 gram sample of an unknown substance (MM = 92.41 g/mol) is heated from -23.1 °C to 51.8 °C. (heat capacity of solid = 2.96 J/g･°C; heat capacity of liquid = 1.75 J/g･°C; ∆Hfus = 8.04 kJ/mol; Tfinal = 17.6 °C)
a) How much energy (in kJ) is absorbed/released to heat the solid?
b)How much energy (in kJ) is absorbed/released to melt the solid?
c)How much energy (in kJ) is absorbed/released to heat the liquid?
d) What is the total amount of energy that must be absorbed/released for the entire process?
Answer:
a) Q₁ = 58.82 KJ
b) Q₂ = 42.48 KJ
c) Q₃ = 29.22 KJ
d) Q = 130.52 KJ
Explanation:
a)
In order to find the energy absorbed to heat the solid, we will use:
[tex]Q_{1} = mC_{1}\Delta T_{1}[/tex]
where,
Q₁ = Heat absorbed for heating solid = ?
m = mass of solid = 488.3 g = 0.4883 kg
C₁ = Specific Heat Capacity of Solid = 2.96 J/g °C
ΔT₁ = Change in temperature of Solid = Melting Temperature - Initial Temp.
ΔT₁ = 17.6°C - (-23.1°C) = 40.7°C
Therefore,
[tex]Q_{1} = (488.3\ g)(2.96\ J/g\ ^{0}C)(40.7\ ^{0}C)[/tex]
Q₁ = 58.82 KJ
b)
In order to find the absorbed to melt the solid at 17.6°C, we will use:
[tex]Q_{2} = nH_{fus}[/tex]
where,
Q₂ = Heat absorbed for melting solid = ?
H_fus = Heat of Fusion = 8.04 KJ/mol
n = no. of moles = [tex]\frac{m}{MM} = \frac{488.3\ g}{92.41\ g/mol} = 5.28 mol[/tex]
Therefore,
[tex]Q_{2} = (5.28\ mol)(8.04\ KJ/mol)[/tex]
Q₂ = 42.48 KJ
c)
In order to find the energy absorbed to heat the liquid, we will use:
[tex]Q_{3} = m C_{3}\Delta T_{3}[/tex]
where,
Q₃ = Heat absorbed for heating Liquid = ?
m = mass of solid = 488.3 g = 0.4883 kg
C₃ = Specific Heat Capacity of Liquid = 1.75 J/g °C
ΔT₃ = Change in temperature of Liquid = Final Temp. - Melting Temp.
ΔT₃ = 51.8°C - 17.6°C = 34.2°C
Therefore,
[tex]Q_{3} = (488.3\ g)(1.75\ J/g\ ^{0}C)(34.2\ ^{0}C)[/tex]
Q₃ = 29.22 KJ
d)
Total amount of energy absorbed during entire process is:
[tex]Q = Q_{1} + Q_{2} + Q_{3}[/tex]
[tex]Q = 58.82\ KJ + 42.48\ KJ + 29.22\ KJ[/tex]
Q = 130.52 KJ
In order to heat a 488.3 g solid, 58.8 kJ are required. To melt the solid, 42.5 kJ are required. To heat the liquid, 29.2 kJ are required. The total amount of energy absorbed is 130.5 kJ.
Initially, a 488.3 g solid at -23.1 °C is heated up to 17.6 °C (melting point). We can calculate the heat required (Q₁) using the following expression.
[tex]Q_1 = c \times m \times \Delta T = \frac{2.96J}{g.\° C } \times 488.3g \times (17.6\° C-(-23.1\° C)) \times \frac{1kJ}{1000J} = 58.8 kJ[/tex]
where,
c: heat capacity of the solidm: massΔT: change in the temperatureAt 17.6 °C, we can calculate the heat (Q₂) required to melt the solid using the following expression.
[tex]Q_2 = \Delta H_{fus} \times \frac{m}{MM} = 8.04 kJ/mol \times \frac{488.3 g}{92.41g/mol} = 42.5kJ[/tex]
where,
∆Hfus: enthalpy of fusionm: massMM: molar massThe liquid is heated from 17.6 °C to 51.8 °C. We can calculate the heat required (Q₃) using the following expression.
[tex]Q_3 = c \times m \times \Delta T = \frac{1.75J}{g.\° C } \times 488.3g \times (51.8\° C-17.6\° C)) \times \frac{1kJ}{1000J} = 29.2 kJ[/tex]
c: heat capacity of the liquidm: massΔT: change in the temperatureThe total amount of energy absorbed (Q) is the sum of the energy absorbed in each step.
[tex]Q = Q_1 + Q_2 + Q_3 = 58.8kJ+42.5kJ+29.2kJ= 130.5kJ[/tex]
In order to heat a 488.3 g solid, 58.8 kJ are required. To melt the solid, 42.5 kJ are required. To heat the liquid, 29.2 kJ are required. The total amount of energy absorbed is 130.5 kJ.
Learn more: https://brainly.com/question/10481356
Which group below correctly list bases that completely dissociate in water
Explanation:
Where's the question?
What kind of ion forms when gallium (Ga) bonds with a non-metal
Answer:
Charged ion
Explanation:
Imagine you are a guest speaker for a kindergarten class and you have been asked to explain the chemical reaction occurring inside of a glow stick. What would you say
Answer:
Following are the solution to this question:
Explanation:
In this opinion, Tim Kane believed that its economy can not be badly affected by low manufacturing jobs in 1979, provided, in which an American industrial production had strong potential growth. Their view also opposes whatever Mr. Grove said of lower US employment particularly cos of increased production figures. Their opinion disputes as much as the American.
In Forbes, they wrote that All our industrial production is breaking records with increasing efficiency, despite a low number of industrial workers. Including Mr. grove, he favors beginning for small businesses. It was mainly due to the big advantage of smaller companies or the production of employment.
Propose the structure of the following HNMR data.
chemical shift ppm splitting integration
3.7 t 2.0
1.75 m 2.0
1.0 t 3.0
mol.formula:C3H7Cl
Answer:
1-Chloropropane is likely the answer (attached a picture)
Explanation:
First off there are 3 peaks and 3 carbons which indicates to me that this will be a chain without any symmetry and that each carbon has hydrogens on it.
Second the triplet at 1.0 that integrates to 3 likely correlates to a CH3 (methyl) group. Peaks are very upfield triplets that integrate to three are almost always methyl peaks.
Third the triplet at 3.7 is indicative of being next to the halogen. Hydrocarbons by themselves do not have peaks that far downfield meaning that its shift could only be explained by the chlorine being involved. Also we know that this can't be next to the methyl group since its multiplicity is to low to be next to it.
That leaves the multiplet at 1.75 being the hydrogens on the middle carbon which also makes sense since it is more downfield then the methyl group (due to being closer to the chlorine) but is not far enough downfield to say the chlorine is there. It also makes sense that it is a multiple since it would be a hextet due to the adjacent 5 hydrogens which can't always be resolved.
I hope this helps and let me know if anything is unclear or needs further explanation.
will give brainliest
Answer:
Na2SO4 + Bi(NO3)3 = Bi2(SO4)3 + NaNO3
A sealed balloon containing 0.51 L of air is carried from Toronto (P-1.01 atm) to Whistler (P=0.78 atm). What would the volume of the bag be in L) upon arrival in Whistler ?
Assume constant temperature and ideal gas behaviour.
Write your answer with 2 significant figures. Enter the number only - do not enter units.
The volume of the bag would be in (L) upon arrival in Whistler : 0.66
Further explanationBoyle's Law
At constant temperature, the gas volume is inversely proportional to the pressure applied
[tex]\rm p_1V_1=p_2.V_2\\\\\dfrac{p_1}{p_2}=\dfrac{V_2}{V_1}[/tex]
V₁=0.51 L
P₁=1.01 atm
P₂=0.78 atm
[tex]\tt V_2=\dfrac{P_1.V_1}{P_2}\\\\V_2=\dfrac{1.01\times 0.51}{0.78}\\\\V_2=0.66[/tex]
2.Pressure is a force, what causes this force
Answer:
Pressure is a stress. It is a scalar given by the magnitude of the force per unit area. In a gas, it is the force per unit area exerted by the change of momentum of the molecules impinging on the surface. ... It is this force, acting on the surface of the solid, that we call the force due to pressure.
Explanation:
I hope this helps
How would I use the word evolution in a sentence?
An open pot of water is heated on the stove. As the water boils, the molecules____________?
Answer:
the molecules . . . separate and eventually evaporate into gas.
Explanation:
In the diagram below, particles of the substance are moving from the liquid phase to the gas phase at the same ra
as they move from the gas phase to the liquid phase.
The gas and liquid are at
O equilibrium.
O a high vapor pressure.
O a low vapor pressure.
O zero vapor pressure.
Mark
Answer:
The gas and liquid are at equilibrium
Also known as motion energy
Answer:
kinetic energy
Explanation:
Answer:
kenetic energy is the one
What is the mole ratio of ammonia (with a pKb of 4.75) to ammonium chloride in a buffer with a pH of 9.09
Answer:
0.692
Explanation:
To solve this problem we can use Henderson-Hasselbach's (H-H) equation:
pOH = pKb + log [tex](\frac{[NH_4Cl]}{[NH_3]})[/tex]In which pOH can be calculated from the pH:
pOH + pH = 14pOH = 14 - pH = 14 - 9.09pOH = 4.91Then we use the H-H equation to calculate[tex]\frac{[NH_4Cl]}{[NH_3]}[/tex]:
4.91 = 4.75 + log [tex](\frac{[NH_4Cl]}{[NH_3]})[/tex]0.16 = log [tex](\frac{[NH_4Cl]}{[NH_3]})[/tex][tex]10^{0.16}[/tex] = [tex]\frac{[NH_4Cl]}{[NH_3]}[/tex][tex]\frac{[NH_4Cl]}{[NH_3]}[/tex]= 1.44As the problem asks for the ratio of ammonia to ammonium chloride, we invert [tex]\frac{[NH_4Cl]}{[NH_3]}[/tex]:
[tex]\frac{[NH_3]}{[NH_4Cl]}=\frac{1}{1.44}[/tex] = 0.692The mole ratio of ammonia to ammonium chloride in a buffer with a pH of 9.09 is 0.692.
How we write Henderson Hasselbalch equation?Henderson Hasselbalch equation for the weak base (NH₃) and for their conjugate acid (NH₄Cl) will be written as:
pOH = pKb + log[NH₄Cl]/[NH₃], where
pKb = base dissociation constant = 4.75
pOH will be calculated from the given value of pH as:
pH + pOH = 14
pOH = 14 - 9.09 = 4.91
Now we these values in the above equation and we get,
4.91 = 4.75 + log[NH₄Cl]/[NH₃]
log[NH₄Cl]/[NH₃] = 0.16
[NH₄Cl]/[NH₃] = 10⁰°¹⁶
[NH₄Cl]/[NH₃] = 1.44
[NH₃]/[NH₄Cl] = 1/1.44
[NH₃]/[NH₄Cl] = 0.692
Hence, required mole ratio is 0.692.
To know more about Henderson Hasselbalch equation, visit the below link:
https://brainly.com/question/26746644
Mercury may have ice trapped in the crater floors near the planet’s north pole.
a. True
b. False
NEED HELP HAVE TO TURN IN IN 5 MIN
The two types of alleles are... (select two) 1 recessive
2expressive
3 dominant
4 doughnut
Answer:
Recessive and Dominant
Explanation:
Answer:
4 doughnut
Explanation:
What was the hiker's average velocity during part C of the hike?
10 km/min southwest
120 km/min west
0.13 km/min west
0.10 km/min north.
Answer:
0.13 km/min west
Explanation:
I just did the test.
A ball is rolled at a velocity of 3 m/s and rolls for 5 seconds. How far does
the ball roll? *
Answer 15m
Explanation: Distance = Speed x Time
3 x 5 =15
To measure the concentration of an aqueous solution of , an analytical chemist adds strong acid to a sample of the solution and titrates it to the endpoint with of potassium permanganate solution. The balanced chemical equation for the reaction is:
The question is incomplete, the complete question is shown in the image attached.
Answer:
7.69%
Explanation:
The balanced equation of this reaction is shown in the image attached to this answer.
The reaction is redox because we can notice a change in the oxidation number of species from left to right in the reaction equation.
For instance, the oxidation number of oxygen was changed from -1 in H2O2 to zero in O2. Hence H2O2 was oxidized.
To calculate the percentage of H2O2 in the sample;
number of moles of KMnO4 = 137 ml/1000 * 0.230 M = 0.03151 moles of KMnO4
From the reaction equation;
2 moles of permanganate reacts with 5 moles of H2O2
0.03151 moles of permanganate reacts with 0.03151 moles * 5/2 = 0.079 moles of H202
Mass of H2O2 reacted = 0.079 moles of H202 * 34 gmol-1 = 2.69 g
Hence % by mass of H2O2 in the sample = 2.69 g/35 g * 100 = 7.69%
A small cylinder of helium gas used for filling balloons has a volume of 2.20 L and a pressure of 14300 kPa at 25 ∘C. Part A How many balloons can you fill if each one has a volume of 1.20 L and a pressure of 1.22 atm at 25 ∘C?
Answer:
You can fill 212 balloons.
Explanation:
First we calculate the helium moles in the small cylinder, using PV=nRT:
P = 14300 kPa ⇒ 14300 * 0.009869 = 141.13 atmV = 2.20 Ln = ?R = 0.082 atm·L·mol⁻¹·K⁻¹T = 25 °C ⇒ 25 + 273.16 = 298.16 K141.13 atm * 2.20 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 298.16 K
n = 12.70 molThen we calculate the number of moles that can fit in a single balloon:
1.22 atm * 1.20 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 298.16 Kn = 0.0599 molFinally we divide the total number of available moles by the number of moles in a single balloon:
12.70 mol / 0.0599 mol = 212.09So the answer is that you can fill 212 balloons.
In the passage, you read about Dalia Kirschbaum, a geomorphologist. In her work, she uses weather data collected
by NASA satellites to study which events?
Answer:
Landslides
Explanation:
Answer:
Landslides
Explanation:
Correct on edge
If the OH- concentration is 1 x 10^-2 , what is the ph
Answer:
the PH would be 12 the person was correct!
Explanation:
4.A 100 L sample of gas is at a pressure of 80 kPa and a temperature of 200 K. What volume does the same
sample of gas occupy at STP?
Answer:
V₂ = 107.84 L
Explanation:
Given data:
Initial volume = 100 L
Initial pressure = 80 KPa (80/101 =0.79 atm)
Initial temperature = 200 K
Final temperature =273 K
Final volume = ?
Final pressure = 1 atm
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
Solution:
V₂ = P₁V₁T₂ /T₁P₂
V₂ = 0.79 atm × 100 L × 273 K / 200 K × 1 atm
V₂ =21567 atm.L.K /200 K.atm
V₂ = 107.84 L
Question 3 of 10
What Group is F (fluorine) in?
O A. ZB
O B. 2
O C. 17
O D. 9
Answer:
C
Explanation:
Answer:
ganyan din ang alam ko
Explanation:
letter c
Need help assap
Will give brainly
Answer:
C!
Explanation:
only C
A: solid B: liquid : C: GAS
Answer:
C.
Explanation:
Gas molecules are always spread far apart, and have room to move freely, so the answer is C.
Cyclopropane rearranges to form propene in a reaction that follows first order kinetics. At 800 K, the specific rate constant for this reaction is 2.74 x 10 - 3 s - 1. Suppose we start with a cyclopropane concentration of 0.290 M. How long will it take for 99.0 % of the cyclopropane to disappear according to this reaction
Answer:
1866.4 secs
Explanation:
The integrated rate law for first order kinetics is given by;
[A] = [Ao] ^-kt
Where;
[A] = concentration of cyclopropane at time = t
[Ao] = initial concentration of cyclopropane
k = rate constant
t = time taken
From the question, we are told that 99% of cyclopropane disappeared hence;
[A] = 0.290 - (0.99 * 0.290)
[A] = 0.290 - 0.2871
[A] = 0.0029 M
Hence
0.0029 = 0.290 e^-2.74 x 10^ - 3 * t
0.0029/0.290 = e^-2.74 x 10^ - 3 * t
0.01 = e^-2.74 x 10^ - 3 * t
ln(0.01) = -2.74 x 10^ - 3 * t
-4.61 = -2.74 x 10^ - 3 * t
t= -4.61/-2.74 x 10^ - 3
t = 1866.4 secs
How many oxygen atoms does 1 mol of 02 gas have?
Answer:
two oxygen atoms
Explanation:
One mole of oxygen gas, which has the formula O2, has a mass of 32 g and contains 6.02 X 1023 molecules of oxygen but 12.04 X 1023 (2 X 6.02 X 1023) atoms, because each molecule of oxygen contains two oxygen atoms.
Answer:
2 * (6.02 * 10^23)
Explanation:
:/
GIVING BRAINLIEST FOR ANSWER!!! What type of bonding takes place between the two atoms?
Answer:
Its B
Explanation:
Answer:
I think the answer is polar covalent as there will be an unequal amount of electrons shared/available. An ionic bond will not take place because the valance shell of the larger atom contains more than 1 electron.
