The heat released by each molecule, in joules, when ethanol undergoes complete combustion is 2.28 × [tex]10^-18[/tex] J.
The number of moles in 1.00 g of ethanol is obtained from;
Mass of ethanol/molar mass of ethanol
Molar mass of ethanol = 46.07 g/mol
Number of moles = 1.00 g/46.07 g/mol = 0.022 moles of ethanol
1 mole of ethanol contains 6.022 × [tex]10^23[/tex] molecules
0.022 moles of ethanol contains 0.022 moles × 6.022 × [tex]10^23[/tex] molecules/1 mole
= 1.32 × [tex]10^22[/tex] molecules of ethanol
If 1.32 × [tex]10^22[/tex] molecules of ethanol release 29.8 × [tex]10^3[/tex] J of heat
1 molecule of ethanol will release 1 molecule × 29.8 × 10^3 J / 1.32 × [tex]10^22[/tex]
= 2.28 × [tex]10^-18[/tex] J
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Calculate ΔG∘rxn at 298 K for the following reaction:
I2(g)+Br2(g)⇌2IBr(g)Kp=436
The change in free energy can help us to discover whether a reaction can be sponteanous or not. The change in free energy fro this reaction is -1.51 kJ/mol.
What is change in free energy?The change in free energy is referred to as that which determines the spontenity of a chemical reaction. For a spontenous reaction the change in free energy must be negative.
Now;
ΔG = -RTlnK
R = gas constant
T = temperature
K = equilibrium constant
So;
ΔG = -(8.314 * 298 * ln 436)
ΔG = -1.51 kJ/mol
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A gas cylinder with a volume of 5.00 L contains 6.00 moles of oxygen gas
at a temperature of 90.0 K. What is the pressure inside the cylinder? The
Ideal gas law constant( R) is 0.0821 L atm/mol K*
8.87 torr
8.87 atm
0.0821 atm
0.0821 torr
Answer:
8.87 atm
Explanation:
From the question given above, the following data were obtained:
Volume (V) = 5 L
Number of mole (n) = 6 moles
Temperature (T) = 90 K
Gas constant (R) = 0.821 atm.L/Kmol
Pressure (P) =?
The pressure inside the container can be obtained by using the ideal gas equation as illustrated below:
PV = nRT
P × 5 = 6 × 0.0821 × 90
P × 5 = 44.334
Divide both side by 5
P = 44.334 / 5
P = 8.87 atm
Therefore, the pressure inside the container is 8.87 atm
The following experiment was performed: A white solid was added to a test tube containing water. The solid completely dissolved and the solution was colorless. Chlorine was added the the solution turned an dark orange color. Hexane was added, the test tube was corked, and the contents was mixed. It was then noted that the hexane was purple in color. What was likely the identity of the white solid
Answer:
Potassium iodide
Explanation:
The white solid introduced into the solution is potassium bromide. This is an ionic solid thus it quickly dissolves in water to yield a colorless solution.
When chlorine is added to this solution, the iodine is displaced since chlorine is above iodine in the electrochemical series.
When mixed with hexane, the color of the solution changes to purple.
Please answer these quickly. :)
Q.1
a) 1 mol of N2 requires 3 moles of H2
so 4 moles of hydrogen will require = 4/3 = 1.33 moles
Answer of A) 1.33 moles
b) 2.5 moles of nitrogen gas were require to produce 5.00 moles of NH3
c) 7.5 moles of hydrogen gas were require to produce
5.00 moles of NH3
Q.2
a) 6 moles of H2 gas were require to make 6.00 mol H2S
b)24 moles of H2 gas were required to react with 3 moles of S8
c)56 moles of H2S are produced from 7 mol of S8
help ! thank u / ill give brainlist !
Give two examples of energy transformations that occur throughout the journey to or on the planet.
Answer:
Our bodies convert chemical energy in our food into mechanical energy for us to move.
An electric fan transforms electrical energy into kinetic energy
Reword it tho
Hope this helps!!
The boiling point of Kelvin scale is:
a) 237º K
b) 100°C
c) 100°K
d) 373°
Answer:
The boiling point of Kelvin scale is: 373° k
hope it is helpful to you
R-134a is contained in a frictionless piston-cylinder device. The initial temperaure of the mixture is 39.37 oC. Over an hour 400 kJ of thermal energy is transferred to the roon which is maintained at a constant temperature of 22 oC. The condensation process is internally reversible. Determine the total entropy generation during this thermal energy process
Solution :
Given :
Initial temperature of the refrigerant is :
[tex]$T_i=39.37 ^ \circ C$[/tex]
= ( 39.37 + 273 ) K
= 312.3 K
Room which is maintained at constant temperature is :
[tex]$T_o=22 ^ \circ C$[/tex]
= (22+273) K
= 295 K
The thermal energy transferred to the room is :
Q = 400 kJ
= [tex]$400 \times 10^3 \ J$[/tex]
Therefore, the total entropy generation during the thermal energy process is :
[tex]$\Delta S =\left[\frac{-Q}{T_i}+ \frac{+Q}{T_i}\right]$[/tex]
Here, -Q = heat is leaving the system maintained at a temperature of [tex]$T_i$[/tex] K.
+Q = heat is entering the system maintained at a temperature of [tex]$T_o$[/tex] K.
Therefore, substituting the values :
[tex]$\Delta S =\left[\frac{-400\times 10^3}{312.3}+ \frac{400\times 10^3}{295}\right]$[/tex]
= [-1280.8197 + 1355.9322]
= 75.1125 J/K
= 0.0751125 kJ/K
= 0.075 kJ/K
What will occur when potassium reacts with sulfur?
PPLLLLLZZZZZ HELPPPPPPPPP ME WITH THIS QUESTION BRAINLIEST PLUS 20 POINTS If CO2 was added to this system what would the outcomes for this reaction be?
CO2 + H2O <-> H2CO3
Question 4 options:
It would shift to the right, favor the forward reaction and the rate of reaction would decrease.
It would shift to the left, favor the forward reaction and the rate of reaction would increase.
It would shift to the right, favor the forward reaction and the rate of reaction would increase.
It would shift to the left, favor the reverse reaction and the rate of reaction would decrease.
It would shift to the right, favor the forward reaction and the rate of reaction would increase.
(third option)
when naming branched chain alkanes, the names of the alkyl substituents are listed in alphabetical order
true or false?
Answer:
False that all kalwlzsjoxla
I need help pleaseee
Answer: So, If we mix 40.0 g of NaOH with enough distilled water to make 500 mL, we will get a 2.00 M NaOH solution.
Explanation: how do you show pictures like how you did??
A 125 g compound consists of 37% oxygen? What is the mass of oxygen in this compound?
19.44%
I think that's the anwer
What is the general form for the simplest type of acid-base reaction?
O A. Acid + base > H+ + OH-
B. Acid + base → base + acid
C. Acid + base + salt + water
D. Acid + base → solid + water
Answer:
Your answer is C
Explanation:
When an acid and base react, the acidic hydrogen ion and the basic hydroxide ion in each acid and base neutralize each other and form water. Meanwhile the conjugate base and conjugate acid (the leftover compounds) react to form an ionic molecule, or a salt. (In chemistry, when an anion and a cation form an ionic bond the new molecule is called a salt). Hope this helps!
What is the thermal efficiency of an engine that takes n moles of diatomic ideal gas through the cycle
Answer:
The thermal efficiency of an engine is [tex]0.15[/tex] that is 15%
Explanation:
Specific heat of a gas at constant volume is
[tex]C_{v}=\frac{fR}{2}[/tex]
here, [tex]f=[/tex]degree of freedom
[tex]R=[/tex]universal gas constant
Thermal efficiency of a cycle is
[tex]\frac{total workdone}{gross heat absorbed}[/tex]
Gross heat absorbed is amount of heat that absorbed.
ω[tex]=P_{o} V_{o}[/tex]
[tex]Q_{AB}=[/tex]Δ[tex]V_{AB}+[/tex]ω[tex]_{AB}[/tex][tex]=nC_{v}(T_{f}-T_{i} )[/tex]
[tex]=n\frac{f}{2}(RT_{f}-RT_{i} )[/tex][tex]=\frac{f}{2}(P_{o}V_{o} )[/tex]
[tex]Q_{BC}=n(\frac{f}{2}+1 )R(T_{f}-T_{i} )[/tex]
[tex]=(\frac{f}{2} +1)(4P_{o}V_{o}-2P_{o}V_{o} )[/tex]=[tex]=(\frac{f}{2}+1)2P_{o}V_{o}[/tex]
[tex]Q_{CD}=-ve and Q_{DA}=-ve[/tex] these 2 are not the part of gross heat
η[tex]=\frac{P_{o}V_{o} }{(\frac{3f}{2}+2 )(P_{o}V_{o})}[/tex]
[tex]=\frac{1}{(\frac{3f}{2}+2 )}[/tex]
For monoatomic gas [tex]f=3[/tex]
η[tex]=\frac{2}{13}[/tex]
[tex]=0.15[/tex]
Use the data below to answer questions 1 - 2. To study heat transfer, a group of students conducted the following experiment. They took two 100 ml water samples at two different temperatures, mixed them together, and recorded the temperatures. Cup Temperature (°C) 1 Volume (ml) 50 50 40 Mixture of 1 and 2 100 watel 1. Based on the information provided in the table above, in which direction will heat flow between the two wate samples when they are mixed? A. Heat will flow from cup 1 to cup 2. B. Heat will flow from cup 2 to cup 1. C. Heat will flow from both cups. D. No heat flow will occur.
If 15L of neon is at 25C is allowed to expand to 45L. What is the new temperature to maintain constant pressure?
Answer:
[tex]T_2=894.45K=621.30\°C[/tex]
Explanation:
Hell there!
In this case, according to the given information, it turns out possible for us to calculate the new temperature by applying the Charles' law as a directly proportional relationship between temperature and volume:
[tex]\frac{V_2}{T_2} =\frac{V_1}{T_1}[/tex]
Thus, we solve for the final temperature, T2, as shown below (make sure T1 is in Kelvins):
[tex]T_2=\frac{V_2T_1}{V_1} \\\\T_2=\frac{(25+273.15)K*45L}{15L}\\\\T_2=894.45K=621.30\°C[/tex]
Regards!
When a balloon containing 635 mL of air is taken from sea level (at standard pressure) to a higher altitude, the balloon expands to 829 mL. What is the air pressure at this new altitude (in atm)?
Answer:
0.766atm
Explanation:
Boyles law
P1V1=P2V2
1×635=P2×829
P2=635/829
P2=0.766atm
A nurse practitioner prepares an injection of promethazine, an antihistamine used to treat allergic rhinitis. If the stock bottle is labeled 30. mg/mL and the order is a dose of 14.0 mg , how many milliliters will the nurse draw up in the syringe?
Answer: Volume is 0.466 ml. Maybe in this case it is safer to round downward.
Explanation: V = 14.0 mg / 30 mg/mL = 0.466.. ml
2.1 milliliters will the nurse draw up in the syringe if the bottle is labeled 30. mg/mL and the order is a dose of 14.0 mg of an injection of promethazine an antihistamine.
What is antihistamine?This is a combination of medications used to treat the temporary symptoms of the common cold and for allergies related to breathing and mostly deals with breathing problems of the one.
Injection used has a fixed dose which varies according to age group for 30. mg/mL and the order is a dose of 14.0 mg can be calculated by,
14/30 ×100 = 2.1 milliliters
Therefore, the nurse draws up the syringe if the bottle is labeled 30. mg/mL and the order is a dose of 14.0 mg of an injection of promethazine an antihistamine it will be 2.1 milliliters.
Learn more about antihistamines, here:
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You dissolve 14 g of [tex]Mg(NO_{3} )_{2}[/tex] in water and dilute to 750 mL. What is the molarity of this solution?
Show your work
What is the energy required to go from liquid to gas called?
A. The specific heat capacity
B. The latent heat of vaporization
C. The thermal energy of a substance
D. The latent heat of fusion
Answer:
B.The latent heat of vaporization
Explanation:
latent heat, also called the heat of vaporization, is the amount of energy necessary to change a liquid to a vapour at constant temperature and pressure.
“When an animal looks a lot like another animal, even though they’re not the same kind of creature at all, it’s called
Answer:
cryptic biodiversity
Explanation:
Which best explains the relationship between evaporation and temperature?
• A liquid evaporates slower at lower temperatures because the molecules are more spread apart and are not pushed
as easily from the liquid's surface.
O A liquid evaporates faster at lower temperatures becaus the attractions are decreased and more particles can
escape the surface of the liquid.
© A liquid evaporates slower at higher temperatures because the vapor pressure of the liquid is higher, SO fewer
molecules can escape the surface.
• A liquid evaporates faster at higher temperatures because more particles have a higher speed and can overcome
attractions in the liquid.
Answer: D
Explanation:
liquid evaporates faster at higher temperatures because more particles have a higher speed and can overcome attractions in the liquid.
Answer:
D. A liquid evaporates faster at higher temperatures because more particles have a higher speed and can overcome attractions in the liquid.
Explanation:
Correct on Edge 2022!!!
Good luck everyone, you got this! Have a great day!
HELP ME ASAP PLEASE
I need the answers I’m in a hurry
Answer: First box----Hail
Second Box-------Snow
Thrid Box-------Sleet
Forth Box-----Rain
Hope that helped! :)
A sample of sodium reacts completely with 0.497 kg of chlorine, forming 819 g of sodium chloride. What mass of sodium reacted?
Express your answer to three significant figures and include the appropriate units.
Answer:
[tex]819 \: g = 819 \times {10}^{ - 3} \: kg = 0.819 \: kg \\ 0.819 \: kg - 0.497 \: kg \\ = 0.322 \: kg[/tex]
What happens to sunlight as it reaches Earth's atmosphere?
Answer:
causes eclips of the sun
A weather balloon is inflated to a volume of 26.7 L at a pressure of 748 mmHg and a
temperature of 28.4 °C. The balloon rises in the atmosphere to an altitude where the pressure is
400. mmHg and the temperature is -15.6 °C.
Assuming the balloon can freely expand, calculate the volume of the balloon at this altitude.
Answer:
42.64 L
Explanation:
Using the combined law equation as follows:
P1V1/T1 = P2V2/T2
Where;
P1 = initial pressure (mmHg)
P2 = final pressure (mmHg)
V1 = initial volume (L)
V2 = final volume (L)
T1 = initial temperature (K)
T2 = final temperature (K)
According to the information in this question,
P1 = 748mmHg
P2 = 400mmHg
V1 = 26.7 L
V2 = ?
T1 = 28.4 °C = 28.4 + 273 = 301.4K
T2 = -15.6 °C = -15.6 + 273 = 257.4K
Using P1V1/T1 = P2V2/T2
748 × 26.7/301.4 = 400 × V2/257.4
66.26= 1.554 V2
V2 = 66.26 ÷ 1.554
V2 = 42.64 L
Pls help which law is that???
Answer:
it is newtons third law
Explanation:
Answer:
Newton's Third Law: Action & Reaction
What is the activity of a 52.3 μCi sample of carbon‑14 in becquerels?
Answer:
1935100 Bq
Explanation:
Let us recall that:
If 1 μCi can be equivalent to 37000 Bq
Then; the activity of 52.3 μCi will be:
[tex]\dfrac{37000 \ Bq}{1 \ \mu Ci}\times 52.3 \ \mu Ci \\ \\ \\ \\ \mathbf{= 1935100 \ Bq}[/tex]
You must make 1 L of 0.2 M acetic acid (CH3COOH). All you have available is concentrated glacial acetic acid (assay value, 98%; specific gravity, 1.05 g/mL). It will take _________ milliliters of acetic acid to make this solution. Assume a gram molecular weight of 60.05 grams.
Answer:
The correct answer is "11.44 ml".
Explanation:
Molarity,
= 0.2 M
Density,
= 1.05 g/ml
Volume,
= 1 L
As we know,
⇒ [tex]Molarity=\frac{No. \ of \ moles }{Volume \ of \ solution}[/tex]
or,
⇒ [tex]No. \ of \ moles=Molarity\times Volume[/tex]
On putting the values, we get
⇒ [tex]=0.2\times 1[/tex]
⇒ [tex]=0.2 \ moles[/tex]
Now,
⇒ [tex]No. \ of \ moles=\frac{Mass \ taken}{Molecular \ mass}[/tex]
or,
⇒ [tex]Mass \ taken=No. \ of \ moles\times Molecular \ mass[/tex]
⇒ [tex]=0.2\times 60.05[/tex]
⇒ [tex]=12.01 \ gram[/tex]
hence,
⇒ [tex]Density= \frac{Mass }{Volume}[/tex]
or,
⇒ [tex]Volume=\frac{Mass}{Density}[/tex]
⇒ [tex]=\frac{12.01}{1.05}[/tex]
⇒ [tex]=11.44 \ ml[/tex]
If the energy of photon emitted from the hydrogen atom is 4.09 x 10-19 J, what is
the wavelength (in nm) of this photon?
Answer:
486 nm
Explanation:
From the question given above, the following data were obtained:
Energy (E) = 4.09×10¯¹⁹ J
Wavelength (λ) =?
Next, we shall determine the frequency of the photon. This can be obtained as follow:
Energy (E) = 4.09×10¯¹⁹ J
Planck's constant (h) = 6.63×10¯³⁴ Js
Frequency (f) =?
E = hf
4.09×10¯¹⁹ = 6.63×10¯³⁴ × f
Divide both side by 6.63×10¯³⁴
f = 4.09×10¯¹⁹ / 6.63×10¯³⁴
f = 6.17×10¹⁴ Hz
Next, we shall determine the wavelength of the photon. This can be obtained as follow:
Frequency (f) = 6.17×10¹⁴ Hz
Velocity of photon (v) = 3×10⁸ m/s
Wavelength (λ) =?
v = λf
3×10⁸ = λ × 6.17×10¹⁴
Divide both side by 6.17×10¹⁴
λ = 3×10⁸ / 6.17×10¹⁴
λ = 4.86×10¯⁷ m
Finally, we shall convert 4.86×10¯⁷ m to nm. This can be obtained as follow:
1 m = 1×10⁹ nm
Therefore,
4.86×10¯⁷ m = 4.86×10¯⁷ m × 1×10⁹ nm / 1 m
4.86×10¯⁷ m = 486 nm
Therefore, the wavelength of the photon is 486 nm