1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
goldfiish [28.3K]
3 years ago
10

If the aluminum block is initially at 25 ∘C, what is the final temperature of the block after the evaporation of the alcohol? As

sume that the heat required for the vaporization of the alcohol comes only from the aluminum block and that the alcohol vaporizes at 25 ∘C. The heat of vaporization of the alcohol at 25 ∘C is 45.4 kJ/mol, the specific heat of aluminum is 0.903 J/g⋅∘C
Chemistry
1 answer:
skad [1K]3 years ago
7 0

Explanation:

The given data is as follows.

       Heat of vaporization (\Delta H_{vap}) = 45.4 kJ/mol

       Specific heat (C_{p}) = 0.903 j/g^{o}C

Let us assume the alcohol given is C_{3}H_{8}O and its mass is 1.12 g. Also, mass of aluminium block is 73.0 g.

First, calculate the moles of alcohol (C_{3}H_{8}O) as follows.

          No. of moles alcohol = \frac{mass}{\text{molar mass}}

                                              = \frac{1.12 g}{60.1 g/mol}

                                              = 0.0186 mol

So, heat absorbed by the alcohol (q_{alcohol}) = heat lost by aluminium (q_{aluminium})

          n \times \Delta H_{vap} = -m \times C_{p} \times \Delta T

          0.0186 mol \times 45.4 kJ/mol = - 73.0 g \times 0.903 J/g^{o}C \times (T_{f} - 25^{o}C)

              12.71 = - (T_{f} - 25^{o}C)

                   T_{f} = 12.3^{o}C

Thus, we can conclude that the final temperature of the block is 12.3^{o}C[/tex].

You might be interested in
A ________ reaction occurs when one compound reacts and is broken down into different elements or simpler compounds?
faust18 [17]

Answer: decomposition

Explanation:

1 . Combustion is a type of chemical reaction in which a hydrocarbon reacts with oxygen to form carbon dioxide ans water along with liberation of large amount of energy.

2. Decomposition is a type of chemical reaction in which a single reactant gives two or more than two products.

CaCO_3\rightarrow CaO+CO_2

3. Single replacement is a type of chemical reaction in which a more reactive element displaces the less reactive element from its slat solution.

4. Synthesis is a type of chemical reaction in which two or more than two reactants combine together to give a single product.

5 0
3 years ago
Read 2 more answers
Pretend that you are the size of an atom, observing a reaction between a potassium atom and a fluorine atom. Write an account of
Crazy boy [7]
 <span>Each atom in an ionic compound tends either to empty or complete the shell to 8 electrons. So when the number of electrons on the external shell is near 8 , the atom tends to attract electrons to complete the shell giving a positive ion called anion 
Conversely when the number of electrons is small the atom gives these electrons to form a positive ion called a cation</span>
7 0
3 years ago
The different molecules that make up the air in a room have on average the same kinetic energy. How does the speed of the differ
kap26 [50]
The formula for kinetic energy is KE=1/2(mv²).  Since both mass and velocity are multiplied by each other, particle with a larger mass needs to be moving slower than a particle with less mass if both have the same kinetic energy. You can think of it as 2KE/m=v² or 2KE/v²=m, If you increase the mass the velocity needs to decrease to keep the same KE value.

I hope this helps.  Let me know in the comments if anything is unclear.
7 0
3 years ago
1. A 5.04 mL sample of Cu has a mass of 45 grams. What is the density of Cu? Show units in final answer
babunello [35]
I think the answer is number D…. I think
4 0
3 years ago
the copper anode is weighed before and after the electrolysis reation. if the copper anode is not completely dry when it is weig
Dmitrij [34]

Answer:

Faraday's constant will be smaller than it is supposed to be.

Explanation:

If the copper anode was not completely dry when its mass was measured, mass of the copper must be heavier than it should have been. Hence, the calculated Faraday’s constant would be smaller than it is supposed to be since when calculating Faraday’s Constant, the charge transferred is divided by the moles of electrons.

5 0
3 years ago
Other questions:
  • What change shows a tenfold increase in concentration of h+ ions?
    7·1 answer
  • What are the products of the chemical reaction that occurs when zinc metal is added to an aqueous solution of hydrochloric acid?
    6·1 answer
  • Determine the pH of a 0.500 M HNO2 solution. Ka of HNO2 is 4.6 * 10-4.
    7·1 answer
  • How much Sr(OH)2 • 8 H2O (M = 265.76) is needed to prepare 250.0 ML of solution in which [OH]= 0.100M?
    8·2 answers
  • Ammonia, NH3, is a weak base with a Kb value of 3.95×10−5. What is the percent ionization of 0.085 M ammonia?
    9·1 answer
  • How do I solve this?
    15·1 answer
  • Why should scientists be able to replicate an investigation?
    7·1 answer
  • Na+CL2=2NACL is the balanced reaction for the formation of table salt. Given 20 grams of Na and 10 grams of Cl2, which reactant
    10·1 answer
  • I really need these solved, it’s asking for half equations!!
    14·1 answer
  • (7.6 x 104m) x (1.5 x 107m)
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!