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
Alekssandra [29.7K]
3 years ago
12

Calculate the change in internal energy of the following system: a 100.0-g bar of gold is heated from 25 ∘C to 50 ∘C during whic

h it absorbs 322 J of heat. Assume the volume of the gold bar remains constant.
Chemistry
2 answers:
NikAS [45]3 years ago
8 0
The Law states that the change in internal energy (U) of the system is equal to the sum of the heat supplied to the system (q) and the work done ON the system (W) 
<span>ΔU = q + W </span>

<span>For the first question, 0.653kJ of heat energy is removed from the system (balloon) while 386J of work is done ON the balloon, thus </span>
<span>ΔU = -653J + 386J </span>
<span>=-267J </span>
<span>Thus internal energy decrease by 267J </span>

<span>For the second question, 322J of heat energy is added to the system (gold bar) while no work is done on the gold bar, this is an isochoric/isovolumetric process, thus </span>
<span>ΔU = 322J + 0 </span>
<span>=322J </span>
<span>Thus internal energy increase by 322J</span>
dangina [55]3 years ago
3 0

The change in internal energy of a gold bar is \boxed{{\text{322 J}}}  

Further explanation:

Thermodynamics:

It is branch of chemistry that is related to heat temperature and connection with work is known as thermodynamics it has wide uses in pyrometallurgy, gas phase reaction gas solid reaction and ATP generation and many more.

First law of Thermodynamics:

It is based on law of energy conservation that states total energy of system remains constant. According to this law, internal energy change is determined by sum of work done on the system and heat supplied. Its mathematical expression is as follows:

\Delta {\text{U}}={\text{q}}+{\text{W}}                                                                   …… (1)

Here,

\Delta{\text{U}} is the change in internal energy of the system.

q is the heat supplied to the system.

W is the work done on the system.

The formula to calculate the work done is as follows:

{\text{W}}={\text{P}}\Delta{\text{V}}                                                                         …… (2)

Here,

W is the work done.

P is the pressure on the system.

\Delta{\text{V}} is the change in the volume of the system.

It is given that the volume of the gold bar remains constant. This implies \Delta{\text{V}} to be zero.

Substitute 0 for \Delta{\text{V}} in equation (2) to calculate the work done on the gold bar.

\begin{aligned}{\text{W}}&={\text{P}}\left( 0 \right)\\&=0\\\end{aligned}

The value of q is 322 J.

The value of W is 0.

Substitute these values in equation (1) to calculate the change in the internal energy of the gold bar.

\begin{gathered}\Delta{\text{U}}={\text{322 J}}+0\\={\text{322 J}}\\\end{gathered}

So the change in internal energy of gold bar is 322 J.

Learn more:

1. What is the final temperature of copper? <u>brainly.com/question/7210400 </u>

2. Calculate the specific heat of gold: <u>brainly.com/question/3032746</u>

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Thermodynamics

Keywords: internal energy, heat, work, q, W, P, 322 J, 0, thermodynamics, first law of thermodynamics, law of conservation of energy, total energy, isolated system, volume, constant.

You might be interested in
What are the radicals?Write their types with four examples.​
polet [3.4K]

Answer:

<h3>A<em><u> group of atoms behaving as a unit in a number of compounds.</u></em><em><u> </u></em></h3>

Explanation:

<h2><em><u>Sorry</u></em><em><u> </u></em><em><u>for</u></em><em><u> </u></em><em><u>giving </u></em><em><u>half</u></em><em><u> </u></em><em><u>a</u></em><em><u>nswer</u></em><em><u> </u></em><em><u> </u></em><em><u>only</u></em><em><u> </u></em><em><u>.</u></em><em><u>I</u></em><em><u> </u></em><em><u>known </u></em><em><u>this</u></em><em><u> </u></em><em><u>much</u></em><em><u> </u></em><em><u>only</u></em><em><u>.</u></em></h2><h2><em><u>I</u></em><em><u> </u></em><em><u>hope</u></em><em><u> </u></em><em><u>U</u></em><em><u> </u></em><em><u>like</u></em><em><u> </u></em><em><u>my</u></em><em><u> </u></em><em><u>answer </u></em><em><u>and</u></em><em><u> </u></em><em><u> </u></em><em><u> </u></em><em><u>my</u></em><em><u> </u></em><em><u>answer</u></em><em><u> </u></em><em><u>help </u></em><em><u>u</u></em><em><u>.</u></em></h2>
4 0
3 years ago
Read 2 more answers
Someone help me please please help whats the ratio of carbon and hydrogen??????? <br>​
MatroZZZ [7]

1:2

The ratio of carbon, hydrogen, and oxygen in most carbohydrates is 1:2:1. This means for every one carbon atom there are two hydrogen atoms and one...

3 0
3 years ago
Which atom’s ionization energy is greater than that of phosphorus (P)? A. Ba B. K C. As D. Cl
WINSTONCH [101]

Answer is: D. Cl (chlorine).

The ionization energy (Ei) is the minimum amount of energy required to remove the valence electron, when element lose electrons, oxidation number of element grows (oxidation process).

Barium, potassium and arsenic are metals (easily lost valence electrons), chlorine is nonmetal (easily gain electrons).

Alkaline metals (in this example, potassium) have lowest ionizations energy and easy remove valence electrons (one electron), earth alkaline metals (in this example, barium) have higher ionization energy than alkaline metals, because they have two valence electrons.

Nonmetals (in this example chlorine) are far right in the main group and they have highest ionization energy, because they have many valence electrons.

5 0
3 years ago
The following pairs of aqueous solutions are separated by a semipermeable membrane. In which direction will the solvent flow?a.
raketka [301]

Answer:

osmosis is a process where by solvent or fluid molecules flow from low concentration to high concentration.

So in

A.solvent will flow from B to A because

B = 3.45 M sodium bromide is more concentrated than 3.45 M calcium iodide;

b) solvent still flow from B to A because

A = 5.00 M sucrose is less concentrated than B = 3.00 M potassium nitrate

7 0
3 years ago
What causes a spring to bounce up when it is pushed down and then released?
nalin [4]

(a) Pushing the spring down gives it stored mechanical energy that turns into motion

Explanation:

Pushing on the spring causes the mechanical energy, of pushing on the spring, to be stored in the spring through potential elastic energy. Due to the elasticity of the spring, when the spring is released and resumes its initial shape the stored energy is released and can be used to do work such as motion.

4 0
3 years ago
Other questions:
  • A crystal of graphite contains which type of bond?
    13·2 answers
  • When will a salt become less soluble in water?
    12·2 answers
  • PLEASE HELP ME ASAPPPPP<br> How many moles are in 10.25 grams of NH3?
    7·1 answer
  • Because ________ change the identity of the substances involved, they are hard to reverse
    9·1 answer
  • A gas occupies a volume of 1.00 L at 25.0°C. What volume will the gas occupy at 1.00 x10^2 °C?
    7·1 answer
  • Both bacteria and rocks split to give rise to more of their kind. Why are bacteria said to reproduce, but rocks are not?
    8·1 answer
  • Sally's index finger is 85 mm long, how long is her index finger in decimeters?
    6·2 answers
  • How does the smell of food being cooked spread so fast ???
    7·2 answers
  • Briefly describe any example of an endothermic reaction and also mention the word equation
    10·1 answer
  • Formula for zinc + nitric acid = zinc nitrate
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!