The heat capacity of the calorimeter in the sample of ethanol is -15.65 kJ/°C.
To determine the heat capacity of the calorimeter, we need to use the formula:
Q = C x ΔT
Where Q is the heat released or absorbed, C is the heat capacity of the calorimeter, and ΔT is the change in temperature. We can rearrange this formula to solve for C:
C = Q / ΔT
We are given the change in temperature (ΔT = 62.3 - 25.0 = 37.3°C) and the molar enthalpy of the reaction (δH°rxn = -1235 kJ). We can use the molar enthalpy to calculate the heat released (Q) by the reaction:
Q = (21.8 g / 46.07 g/mol) x (-1235 kJ/mol) = -583.7 kJ
Now we can plug in the values of Q and ΔT into the formula to find the heat capacity of the calorimeter:
C = (-583.7 kJ) / (37.3°C) = -15.65 kJ /°C
Therefore, the heat capacity of the calorimeter is -15.65 kJ/°C.
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The photograph below shows a carved limestone head. The surface of this
limestone has changed over many years.
Which process made the surface of the limestone change over many years?
carving
polishing
melting
weathering
Name a substance in the air that made the surface of the limestone
change.
ASAP
Answer:
Weathering (I think)
Explanation:
don't know what else to add because you need a minimum of twenty words to answer
Which of the following excerpts is an analogy?
A. First is the danger of futility, the belief there is nothing one man or one woman can do against the enormous array of the world's ills. . . . (paragraph 2)
B. [A]nd crossing each other from a million different centers of energy and daring, those ripples build a current which can sweep down the mightiest walls of oppression and resistance. . . . (paragraph 4)
C. Few men are willing to brave the disapproval of their fellows, the censure of their colleagues, the wrath of their society. (paragraph 5)
D. [T]hose with the courage to enter the conflict, will find themselves with companions in every corner of the world. (paragraph 6)
Answer:
D is an analogy. In this analogy, the courage to enter the conflict is compared to having companions in every corner of the world.
Please answer with explanation 100 points awarded
Answer:
[tex]-3[/tex]
Explanation:
Given
[tex]4^{\frac{1}{2} }*\frac{2}{\sqrt[4]{16} } -10\div 2[/tex]
Lets evaluate the given expression.
Remember to use PEMDAS.
In the second term, rewrite [tex]16[/tex] as [tex]2^4[/tex].
[tex]4^{\frac{1}{2} }*\frac{2}{\sqrt[4]{2^4} } -10\div 2[/tex]
Pull terms out from under the radical, assuming positive real numbers, then simplify.
[tex]4^{\frac{1}{2}} *\frac{2}{2} -10\div 2\\4^{\frac{1}{2}} *1-10\div 2\\4^{\frac{1}{2}}-10\div 2[/tex]
Rewrite [tex]4[/tex] as [tex]2^2[/tex].
[tex](2^2)^{\frac{1}{2}} *\frac{2}{2} -10\div 2[/tex]
We can use the power rule to multiply exponents.
The power rule is
[tex](a^b)^c=a^b^c[/tex]
[tex]2^{2\left(\frac{1}{2}\right) } *\frac{2}{2} -10\div 2[/tex]
Cancel the common factor of 2.
[tex]2^1*\frac{2}{2} -10\div 2[/tex]
Any number to the power of 1 stays the same.
[tex]2*\frac{2}{2} -10\div 2[/tex]
[tex]\frac{2}{2}[/tex] is equal to [tex]1[/tex]
[tex]2*1 -10\div 2[/tex]
Any number multiplied by 1 stays the same.
[tex]2-10\div 2[/tex]
Divide [tex]10[/tex] by [tex]2[/tex].
[tex]2-5[/tex]
Subtract [tex]5[/tex] from [tex]2[/tex].
[tex]-3[/tex]
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In passage 2, president Obama begins with a reminder to the audience of important laws former president Lyndon b Johnson signed into effect in 1965 what impact does this have on the development of president Obama claim
Answer:
A
Explanation:
just do it
Decide if the following sentence is grammatically correct or incorrect. Éste es mío. Correct incorrect.
The following sentence is grammatically correct: Éste es mío.
Explanation:
In Spanish, "Éste es mío" means "This one is mine." The sentence is grammatically correct because it follows the correct subject-verb-object structure. The subject "Éste" (This one) is followed by the verb "es" (is) and the object "mío" (mine).
Additionally, the accent mark on "Éste" is correctly placed to indicate emphasis on the first syllable. Therefore, the sentence is grammatically correct.
Finally, the verb "es" is correctly conjugated for the sentence. This verb is used to indicate that something is in a certain state or condition, and it is conjugated in the third person singular form. Therefore, this sentence is grammatically correct.
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The following sentence is grammatically correct: Éste es mío.
In Spanish, "Éste es mío" means "This one is mine." The sentence is grammatically correct because it follows the correct subject-verb-object structure. The subject "Éste" (This one) is followed by the verb "es" (is) and the object "mío" (mine).
Additionally, the accent mark on "Éste" is correctly placed to indicate emphasis on the first syllable. Therefore, the sentence is grammatically correct.
Finally, the verb "es" is correctly conjugated for the sentence. This verb is used to indicate that something is in a certain state or condition, and it is conjugated in the third person singular form. Therefore, this sentence is grammatically correct.
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priya looks at this histogram of a distribution with a mean of 5.6 grams and a standard deviation of 1.4 grams. she claims that approximately 68% of the data is between 4.9 and 6.3 grams. what is the error in her thinking?
It appears that Priya misunderstood the range of one standard deviation with the range of two standard deviations when she stated that roughly 68% of the data falls between 4.9 and 6.3 grammes.
Which graph has a higher standard deviation, and how do you determine which one?More values deviate from the mean as standard deviation increases. Variable A's graph will have a higher standard deviation because the left and right bars in its histogram are higher than those in variable B's.
A high degree of standard deviation is what?When the standard deviation is close to zero, it means that the data points are relatively close to the mean; when it is high or low, it means that the data points.
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How far is this fringe from the center of the pattern?.
Answer:
Pattern is equal to the distance between the slit and screen multiplied by the tangent of the angle.
The web development team is having difficulty connecting by ssh.
There could be a variety of reasons why the web development team is having difficulty connecting by ssh. Some common issues include incorrect login credentials, network issues firewall blocking the connection, or server configuration problems.
First, make sure that the login credentials are correct and that the correct port is being used. If that is not the issue, check for any network issues that may be preventing the connection. If there are no network issues, check the firewall settings to ensure that the connection is not being blocked. Lastly, make sure that the server configuration is correct and that there are no issues with the ssh daemon.
If none of these solutions work, it may be best to contact the network or server administrator for assistance.
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The complete combustion of ethanol, c2h5oh (fw = 46. 0 g/mol), proceeds as follows: c2h5oh(l) + 3 o2(g) → 2 co2(g) + 3 h2o(l) δh = −555 kj what is the enthalpy change for combustion of 15. 0 g of ethanol?.
The enthalpy change for combustion of 15.0 g of ethanol in the chemical reaction is -180.93 kJ.
The enthalpy change for combustion of 15.0 g of ethanol can be calculated using the equation:
ΔH = (ΔH°/mol) × (mol/mass) × mass
Where ΔH° is the standard enthalpy change for the reaction, mol is the number of moles of ethanol, and mass is the mass of ethanol in grams.
Given that the standard enthalpy change for the combustion of ethanol is -555 kJ, the molecular weight of ethanol is 46.0 g/mol, and the mass of ethanol is 15.0 g, we can plug these values into the equation:
ΔH = (-555 kJ/mol) × (1 mol/46.0 g) × (15.0 g)
Simplifying the equation gives:
ΔH = (-555 kJ/mol) × (0.326 mol)
ΔH = -180.93 kJ
Therefore, the enthalpy change for combustion of 15.0 g of ethanol is -180.93 kJ.
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The goal of ___________ is to focus on summarizing and explaining a specific set of data.
Hello!
The correct answer for the blank is: Descriptive Statistics.
I really hope this helped you out! :)
In the autumn season, leaves become brown-orange in color
and fall down off trees. Indicate which change these leaves undergo, and give
evidence
A table with a list price of x dollars is discounted by 15% and then discounted an additional 12%. What is the final sale price of the tablet, in terms of x?
The final sale price of the tablet is 0.748x
What is discount?Discount results in the reduction of the selling price of the product, which makes it more attractive for the customer.
Reduction in price makes a psychological impact on the customer which results in the purchase. The two types of discount offered are trade discount and cash discount.
x is discounted by 15%
= x × 15/100
= 15x /100
The new price = x -15x/100
= 85x/100
It is discounted again by 12%
85 x/100 × 12/100
= 1020x/10000
= 102x/100
The final sale price
= 85x /100 - 102 x/1000
= (850x-102 x)/1000
= 748x/1000
= 0.748x
Therefore the final sale price is 0.748x
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