Answer:
12.78 kJ
Explanation:
The correct balanced reaction would be
[tex]2CH_3OH\rightarrow 2CH_4+O_2\Delta H=252.8\ \text{kJ}[/tex]
Mass of methanol = [tex]3.24\ \text{g}[/tex]
Moles of methanol can be obtained by dividing the mass of methanol with its molar mass [tex](32.04\ \text{g/mol})[/tex]
[tex]\dfrac{3.24}{32.04}=0.10112\ \text{moles}[/tex]
Enthalpy change for the number of moles is given by
[tex]\dfrac{\text{Number of moles of methanol in the reaction}}{\text{Enthalpy change in the reaction}}=\dfrac{\text{Number of moles in 3.24 g of methanol}}{\text{Enthaply in change in the mass of methanol}}[/tex]
[tex]\\\Rightarrow\dfrac{2}{252.8}=\dfrac{0.10112}{\Delta H}\\\Rightarrow \Delta H=\dfrac{0.10112\times 252.8}{2}\\\Rightarrow \Delta H=12.781568\approx 12.78\ \text{kJ}[/tex]
The change in enthalpy is 12.78 kJ.
When 3.24 g of CH₃OH are decomposed, the change in the enthalpy is 12.8 kJ.
Let's consider the following thermochemical equation.
2 CH₃OH ⇒ 4 CH₄ + O₂ ∆H = 252.8 kJ
First, we will convert 3.24 g of CH₃OH to moles using its molar mass (32.04 g/mol).
[tex]3.24 g \times \frac{1mol}{32.04g} = 0.101 mol[/tex]
According to the thermochemical equation, 252.8 kJ are absorbed when 2 moles of CH₃OH react. The enthalpy change when 0.101 moles of CH₃OH react is:
[tex]0.101 mol \times \frac{252.8 kJ}{2mol} = 12.8 kJ[/tex]
When 3.24 g of CH₃OH are decomposed, the change in the enthalpy is 12.8 kJ.
Learn more: https://brainly.com/question/2874342
Which material is typically used as a thermal insulator
Answer: plastic, wood, rubber
Explanation:
Answer:
Lots of items.
Explanation:
Fiber, mineral wool, and corks.
The economy of each region was shaped by all of the following factors, except:
A. Geography
B. Climate
C. Language
D. Population
Answer:
Language
Explanation:
this is very obvious not to be mean
What body system controls the brain, spinal cord, nerves, and sense organs?
Answer:
The central nervous system
WHAT IS THE DENSITY OF A BLOCK WITH A
VOLUME OF 24 ML AND A MAS 3.2 G?
Answer:
The answer is 7.5 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
So we have
[tex]density = \frac{24}{3.2} \\ [/tex]
We have the final answer as
7.5 g/mLHope this helps you
The elementary gas-phase reaction
A → B
takes place isobarically and isothermally in a PFR where 63.2% conversion is achieved. The feed is pure A. It is proposed to put a CSTR of equal volume upstream of the PFR. Based on the entering molar flow rate to A to the first reactor, what will be the intermediate from the CSTR, X1, and exit conversion from the PFR, X2, based on the feed to first reactor?
Answer:
Xa1 = 0.5
Xa2 = 0.815
Explanation:
Elementary gas-phase reaction
A → B taking place isobarically and isothermally and the feed is Pure
conversion rate = 63.2%
The intermediate from the CSTR (XA1 ) = 50%
conversion in the PFR at the exit ( XA2 ) = 0.815
Attached below is the detailed
Give two examples. What is prey?
Answer: deer and a rabbit or zebra
A rectangular solid has a length of 3 cm height of 4 cm and a Width of My 5 cm what is a solid volume
Volume = length x width x height
Volume = 3cm x 5cm x 4cm
Volume = 60cm3
Hope this helps! :)
is water a mineral? HELP ASAP!!!!
Answer:
Water is not a mineral because it is not a solid.
Explanation: If water were turned into ice then it would be considered if water were turned into ice then it would be considered a mineral.
If 20.0 kilocalories of energy were added to 80.0 g of water, what change in temperature would be observed?
Please explain how.
Answer:
250 °C.
Explanation:
From the question given above, the following data were:
Heat (Q) required = 20.0 kilocal
Mass (M) of water = 80 g
Change in temperature (ΔT) =.?
Next, we shall convert 20.0 Kilocalories to calories. This can be obtained as shown below:
1 kilocal = 1000 Cal
Therefore,
20 kilocal = 20 kilocal × 1000 Cal / 1 kilocal
20 kilocal = 20000 calories
Therefore, 20 kilocalorie is equivalent to 20000 calories.
Finally, we shall determine the change in temperature observed as follow:
Heat (Q) required = 20000 Cal
Mass (M) of water = 80 g
Specific heat capacity (C) of water = 1 Cal /gºC
Change in temperature (ΔT) =.?
Q = MCΔT
20000 = 80 × 1 × ΔT
20000 = 80 × ΔT
Divide both side by 80
ΔT = 20000 / 80
ΔT = 250 °C
Therefore, the change in temperature observed is 250 °C
Which of the following is true about metallic bonds?
o A. Electrons are strongly attracted to the nucleus.
B. Electrons of metals are always shared.
C. Electrons are highly stable.
O
D. Electrons are delocalized.
Answer:
D: electrones are delocalized
The metallic bond has been characterized with the de localization of the electrons. Thus, option D is correct.
Metallic bond has been the type of inter-molecular force that has been found in between the metal atoms.
Metals atom have been capable of donating the electrons in order to become stable. In the metallic bond, there has been the de-localization of the electrons of p orbitals that has been resulted in the electron cloud for the formation of the metallic bond.
Thus, the metallic bond has been characterized with the de localization of the electrons. Thus, option D is correct.
For more information about the metallic bond, refer to the link:
https://brainly.com/question/10714037
Please Help. Will mark as Brainliest
Answer:
You are correct. The answer is [tex]X_{3} Z[/tex].
Which statement best describes a scientific theory?
A) It is a scientific fact that no longer requires any evidence to support it.
B) It is a general statement that is supported by many scientific observations.
C) It is an educated guess that can be tested by experimentation.
D) It is a collection of data designed to provide support for a prediction.
Answer:
B
Explanation:
Just because it is a theory doesnt mean it does not need evidence or odservations.
Answer:
it’s c
Explanation:
it’s c
The diagram show the box for an element in the periodic table . What is the atomic mass of the element shown .
Answer:32.1
Explanation:
Uneven heating of Earth's surface creates pressure differences that result in ____________.
Answer:
Updrafts (and can cause thunderstorms and other violent weather.)
Good luck, hope this helped!
Help Please!! (The Question is in the picture!)
Answer:
the answer that best describe the two methods is c
9.87 x 10^-5km - 8.76 x 10^-6km
Ammonia molecule has got trigonal pyramidal geometry even though central atom gets sp3 hybridization. Give reason.
A 130.3 g piece of copper (specific heat 0.38 J/g･°C) is heated and then placed into 400.0 g of water initially at 20.7°C. The water increases in temperature to 22.2°C. What is the initial temperature of the copper? (The specific heat of water is 4.18 J/g･°C).
Answer:
Approximately [tex]72.9\; \rm ^\circ C[/tex], assuming that this system is insulated properly.
Explanation:
Calculate the amount of energy that the water here has gained (using the increase in its temperature.)
[tex]\begin{aligned} Q(\text{water}) &= c(\text{water}) \cdot m(\text{water}) \cdot \Delta T(\text{water}) \\ &=4.18 \times 400.0 \times (22.2 - 20.7) \approx 2508.0\; \rm J \end{aligned}[/tex].
Assume that this system (copper and water) is well-insulated and has no heat exchange with its surroundings. The amount of energy that water gained should be equal to the of energy that copper has lost. However, the sign of the energy change of copper should be negative because copper had lost energy:
[tex]Q(\text{copper}) = -Q(\text{water}) \approx -2508.0\; \rm J[/tex].
Calculate the temperature change of this piece of copper. Note, that this temperature change is the difference between the initial temperature of the copper piece and the final temperature [tex]22.2\; \rm ^\circ C[/tex] of the system.
[tex]\begin{aligned}\Delta T(\text{copper}) &= \frac{Q(\text{copper})}{c(\text{copper}) \cdot m(\text{copper})} \approx \frac{-2508.0}{130.3 \times 0.38} \approx 50.65\; \rm ^\circ C\end{aligned}[/tex].
Calculate the initial temperature of this piece of copper given its final temperature and the change to its temperature:
[tex]\begin{aligned}T(\text{copper, initial}) &= T(\text{copper, final}) - \Delta T(\text{copper}) \\ &\approx 22.2 + 50.65 \approx 72.9\; \rm ^\circ C\end{aligned}[/tex].
sapling is to a tree as a _______ is to a horse... help meee
Which of the following groups makes a neutral salt of the form AB
Answer:
Groups II and VI
Explanation:
Hello.
In this case, regarding cations from groups I whose oxidations states are +1, II whose oxidation states are +2 and III whose oxidation states are +3 we can see that when they combine with nonmetallic anions they exchange the charges via subscripts. In such a way, when bonding for instance calcium ions with sulfide ions, we obtain:
[tex]Ca^{2+}S^{2-}=Ca_2S_2[/tex]
Which can be simplified to give:
[tex]CaS[/tex]
If we do the same for oxygen, selenium and tellurium, we find the same form since nonmetals from group VIA could form anions with -2 as they need two electrons to attain the octet, therefore, answer is groups II and VI.
Regards.
I need help with my slide show, how is sandstone formed.
Answer:
Sandstone is a rock comprising mostly of minerals formed from sand. The stone gains its formation throughout centuries of deposits forming in lakes, rivers, or on the ocean floor. These elements group together with the minerals quartz or calcite and compresses. In time, the sandstone is formed by the pressure of these minerals coming together.
Explanation:
Answer:
Sandstone is a rock comprising mostly of minerals formed from sand. The stone gains its formation throughout centuries of deposits forming in lakes, rivers, or on the ocean floor. These elements group together with the minerals quartz or calcite and compresses.
Explanation:
How does rainfall affect a biome !?!?!!??!
A calibration curve was created to determine the quantity of protein in a solution. The calibration curve has the form of a straight line with the equation A = 0.0182 x +0.007 where A is the corrected absorbance of the solution and x is quantity of protein in the solution in units of micrograms (μg). Determine the quantity of protein in a solution that has an absorbance of 0.207. A blank solution has an absorbance of 0.050 .
Answer:
(a) 10 quantities of protein
(b) 2 quantities of protein
Explanation:
Given
[tex]A = 0.0182 x +0.007[/tex]
Solving (a):
Solve for x when A = 0.207
Substitute 0.207 for A
[tex]A = 0.0182 x +0.007[/tex]
[tex]0.207 = 0.0182x + 0.007[/tex]
Solve for 0.0182x
[tex]0.0182x = 0.207 - 0.007[/tex]
[tex]0.0182x = 0.200[/tex]
Solve for x
[tex]x = 0.200/0.0182[/tex]
[tex]x = 10.989010989[/tex]
[tex]x = 11[/tex] (Approximated)
Solving (b):
Solve for x when A = 0.050
Substitute 0.050 for A
[tex]A = 0.0182 x +0.007[/tex]
[tex]0.050 = 0.0182x + 0.007[/tex]
Solve for 0.0182x
[tex]0.0182x = 0.050 - 0.007[/tex]
[tex]0.0182x = 0.043[/tex]
Solve for x
[tex]x = 0.043/0.0182[/tex]
[tex]x = 2.36263736264[/tex]
[tex]x = 2[/tex] (Approximated)
I WILL GIVE BRAINLIEST! ANSWER ASAP! If 50 grams of vinegar and 10 grams of baking soda are poured into a container, what will the final mass of the products be?
Answer: Wouldn't that just be 60 grams?
Explanation:
50+10=60
Please answer 11 to 13 to receive 10 Brainly points. Please read the bullet points to under the questions. And check the molecular formula image.
Answer:
11 yes
12 H2O( water molecules)
13 3H2O( water molecules)
Explanation:
Sry, my phone's a potato, so I didn't read it properly, so I'm not sure about the question 11.
11-yes, they stay together, but they release 3 molecules of OH an H.
12- here it talks about what will happen with OH and H: they will be H2O (water molecules).
13- and here we end it with the informations that we got: 3 fatty acids+ glycerol---> fat+ 3H2O( the 3 H and 3 OH)
A woman is brought into the emergency room experiencing nausea and vomiting. She is also hyperventilating. She says that she ingested a bottle of aspirin about two hours earlier. Aspirin (acetylsalicylic acid) is converted to salicylic acid in the stomach. Assuming 100% conversion to salicylic acid.
Required:
Calculate the percentage of protonated and unprotonated forms of salicylic acid in her stomach, given a pH of 2.0 for the stomach.
Answer:
Protonated form: 96.87%
Unprotonated form: 3.13%
Explanation:
To find the percentage of protoned and unprotoned forms of salicylic acid we must use Henderson-Hasselbalch equation:
pH = pKa + log [A⁻] / [HA]
Where pKa of salicylic acid is 3.49; [A⁻] is the unprotonated form and [HA]:
2.0 = 3.49 + log [A⁻] / [HA]
0.03236 = [A⁻] / [HA] (1)
And as:
[A⁻] + [HA] = 100% (2)
Replacing (2) in (1):
0.03236 = 100 - [HA] / [HA]
0.03236 [HA] = 100 - [HA]
1.03236[HA] = 100
[HA] = 96.87%And [A⁻]:
[A⁻] = 100 - 96.87
[A⁻] = 3.13%
How does water shape earth surfaces
Answer:
jeanne I have to be at work at school
A solid that forms from liquids in a chemical reaction is called a
PLZ HELP
Answer:
precipitate
Explanation:
C10H22 + O2 -- CO2 + H2O balance
Answer:
1,31÷2 =10,11
Explanation:
c10h22+31÷2o2=10co2+11h2o
Different kind of London are used in eyeglasses to help people with eye conditions
Answer:
true
Explanation: