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
MariettaO [177]
3 years ago
14

How much energy is required when a 142.1 gram sample of aluminum goes from 25.5°C to 46°C? (the specific heat of aluminum is 0.9

0 J/g °C).
Chemistry
1 answer:
vfiekz [6]3 years ago
4 0

Answer:

2621.75 j heat is required to increase the temperature 25.5°C to 46°C.

Explanation:

Given data:

Mass of sample = 142.1 g

Initial temperature = 25.5°C

Final temperature = 46°C

Specific heat capacity of Al = 0.90 J/g.°C

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 46°C - 25.5°C

ΔT = 20.5°C

Q = 142.1 × 0.90 J/g.°C × 20.5°C

Q = 2621.75 j

Thus,  2621.75 j heat is required to increase the temperature 25.5°C to 46°C.

You might be interested in
In electrophilic aromatic substitution reactions the hydroxyl group is an o p-director because?
Natalka [10]

In electrophilic aromatic substitution reactions the hydroxyl group is an o,p-director because: hydroxyl group donates the electron density to the ring by induction and destabilizes the meta sigma complex and  by resonance and it  stabilizes the ortho and para sigma complexes of aromatic ring .

Most ring activators have atoms with unshared electron pairs directly attached to a carbon atom of the benzene ring . For example, the — OH group has two pairs of unshared electrons on the oxygen atom , which will form a bond to a carbon atom of the benzene ring . Thus , the — OH group will be an activating group in electrophilic aromatic substitution reactions .

to learn more about electrophilic aromatic substitution reactions please click here ,

brainly.com/question/28286554

#SPJ4

5 0
2 years ago
What is the importance of the electrons?<br> (write in one paragraph)
My name is Ann [436]
Well in everything we have protons and electrons, eg. In static electrisity in a balloon when you rub the balloon on a material like your hair all the protons come off and into your hair which makes your hair go upright and funny and the ballon is desperate to get back the protons so it sticks to surfaces to gain there protons to ballance out the electrons it allready has for it to be nuteral again. Because its important for everything that can be to be nuteral
4 0
4 years ago
Read 2 more answers
Calculate ΔHrxn for the following reaction: Fe₂O₃(s)+3CO(g)→2Fe(s)+3CO₂(g) Use the following reactions and given ΔH′s. 2Fe(s)+3/
ExtremeBDS [4]

Answer : The enthalpy change of reaction is -23.9 kJ

Explanation :

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

The given final reaction is,

Fe_2O_3(s)+3CO(g)\rightarrow 2Fe(s)+3CO_2(g)    \Delta H=?

The intermediate balanced chemical reaction will be,

(1) 2Fe(s)+\frac{3}{2}O_2(g)\rightarrow Fe_2O_3(s)    \Delta H^o_1=-824.2kJ

(2) CO(g)+\frac{1}{2}O_2(g)\rightarrow CO_2(g)    \Delta H^o_2=-282.7kJ

First we will reverse the reaction 1 and multiply equation 2 by 3 then adding both the equation, we get :

(1) Fe_2O_3(s)\rightarrow 2Fe(s)+\frac{3}{2}O_2(g)    \Delta H^o_1=+824.2kJ

(2) 3CO(g)+\frac{3}{2}O_2(g)\rightarrow 3CO_2(g)    \Delta H^o_2=3\times (-282.7kJ)=-848.1kJ

The expression for final enthalpy is,

\Delta H=\Delta H^o_1+\Delta H^o_2

\Delta H=(+824.2kJ)+(-848.1kJ)

\Delta H=-23.9kJ

Therefore, the enthalpy change of reaction is -23.9 kJ

7 0
3 years ago
a population of cacti in the Sonoran desert all need to get water what type of dispersion will they most likely show A. they wil
Yuri [45]

Answer:

Your answer is A. They will show even dispersion to get water.

Explanation:

3 0
4 years ago
Read 2 more answers
54 Identify the type of bonding in solid potassium.
Vadim26 [7]
Base on the question and in my further research and investigation about the said problem that states to identify the type of bonding in solid potassium, I would say that the bondings are metallic bonding and metallic. I hope you are satisfied with my answer and feel free to ask for more 
4 0
3 years ago
Other questions:
  • The skeletal part of the musculoskeletal system:
    11·2 answers
  • A solution is made by dissolving 0.656 mol of nonelectrolyte solute in 869 g of benzene. calculate the freezing point, tf, and b
    13·1 answer
  • Susan shakes a bottle of oil and vinegar salad dressing, then sets it on the table. After a while, the oil rises to the top and
    13·1 answer
  • Suppose you find a yellow piece of metal in a stream how could you tell it’s real gold
    7·1 answer
  • 7. How many minutes are there in 5 days?​
    7·2 answers
  • A compound is known to contain 15% sulfur.
    14·1 answer
  • How could we stop an asteroid that we know was going to hit Earth?<br><br><br> Pls help ASAP
    9·2 answers
  • Please help!
    6·2 answers
  • 1. Cars use<br> to run, then they spit out carbon.
    12·1 answer
  • What is the frequency of a radio wave with a a wavelength of 3 m? (Hint: MHz
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!