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
QveST [7]
3 years ago
8

Consider the reaction: 2 H2O (g)-->2 H2 (g) + O2 (g). ΔH=483.6 Kj/mol. If 2 moles of H2O (g) are converted H2(g) and O2(g) ag

ainst a pressure of 1 atm at 125 degrees Celcius what is ΔE of reaction?
Chemistry
2 answers:
denis-greek [22]3 years ago
5 0
DE = dH - PdV 

<span>2 H2O(g) → 2 H2(g) + O2(g) </span>

<span>You can see that there are 2 moles of gas in the reactants and 3 moles of gas in the products. </span>

<span>1 moles of ideal gas occupies the same volume as 1 mole of any other ideal gas under the same conditions of temp and pressure. </span>

<span>Since it is done under constant temp and pressure that means the volume change will be equal to the volume of 1 mole of gas </span>

<span>2 moles reacts to form 3 moles </span>

<span>The gas equation is </span>

<span>PV = nRT </span>
<span>P = pressure </span>
<span>V = volume (unknown) </span>
<span>n = moles (1) </span>
<span>R = gas constant = 8.314 J K^-1 mol^-1 </span>
<span>- the gas constant is different for different units of temp and pressure (see wikki link) in this case temp and pressure are constant, and we want to put the result in an equation that has Joules in it, so we select 8.314 JK^-1mol^-1) </span>
<span>T = temp in Kelvin (kelvin = deg C + 273.15 </span>
<span>So T = 403.15 K </span>

<span>Now, you can see that PV is on one side of the equation, and we are looking to put PdV in our dE equation. So we can say </span>

<span>dE = dH -dnRT (because PV = nRT) </span>

<span>Also, since the gas constant is in the unit of Joules, we need to convert dH to Joules </span>

<span>dH = 483.6 kJ/mol = 483600 Joules/mol </span>

<span>dE = 483600 J/mol - (1.0 mol x 8.314 J mol^-1K-1 x 403.15 K) </span>
<span>dE = 483600 J/mol - 3351.77 J </span>
<span>dE = 480248.23 J/mol </span>
<span>dE = 480.2 kJ/mol </span>
jasenka [17]3 years ago
3 0

Answer : The value of \Delta E of the reaction is, 480.29 KJ.

Explanation :

Formula used :

\Delta E=\Delta H-\Delta n_g\times RT

where,

\Delta E = internal energy of the reaction = ?

\Delta H = enthalpy of the reaction = 483.6 KJ/mole = 483600 J

\Delta n_g = change in the moles of the reaction = Moles of product - Moles of reactant = 3 - 2 = 1 mole

R = gas constant = 8.314 J/mole.K

T = temperature = 125^oC=273+125=398K

Now put all the given values in the above formula, we get:

\Delta E=483600J-(1mole\times 8.314J/mole.K\times 398K)

\Delta E=480291.028J

\Delta E=480.29KJ

Therefore, the value of \Delta E of the reaction is, 480.29 KJ.

You might be interested in
Phosphorus atomic radius is smaller than magnesium atomic radius <br> True or false
stealth61 [152]

Answer:

True

Explanation:

Atomic radius can be defined as a measure of the size (distance) of the atom of a chemical element such as hydrogen, oxygen, carbon, nitrogen etc, typically from the nucleus to the valence electrons. The atomic radius of a chemical element decreases across the periodic table, typically from alkali metals (group one elements such as hydrogen, lithium and sodium) to noble gases (group eight elements such as argon, helium and neon). Also, the atomic radius of a chemical element increases down each group of the periodic table, typically from top to bottom (column).

<em>Hence, the atomic radius of phosphorus is smaller than the atomic radius of magnesium. Basically, the atomic radius of phosphorus is 98 pm while the atomic radius of magnesium is 145 pm.</em>

4 0
2 years ago
Tron 200g dung dich NaCl 40% voi m gam dung dich NaCl 20% thu duoc dung dich NaCl 25% . tinh m
Sati [7]

Answer:cool

Explanation:radical dude

8 0
2 years ago
Convert 9.90km to mm
sukhopar [10]

Answer:

9900000

add 20 LeTtErS or mOrE

3 0
3 years ago
Calculate the average obtained from the following weighings of the same object. Do not forget to include formulas, units, and th
bazaltina [42]

Answer:

10.4376 g

Explanation:

First we <u>calculate the sum of the weighings</u>:

  • 10.4375 g + 10.4381 g + 10.4373 g + 10.4376 g = 41.7505 g

Then we <u>divide the sum by the number of weighings to calculate the average:</u>

  • Number of weighings = 4
  • Average = Sum of weighings / Number of weighings
  • 41.7505 g / 4 = 10.4376 g
6 0
2 years ago
Green plants use light from the Sun to drive photosynthesis, a chemical reaction in which liquid water and carbon dioxide gas fo
Artyom0805 [142]

Answer:

.

Explanation:

3 0
3 years ago
Other questions:
  • Draw the skeletal structure for the monohalogenated alkene formed when trans-1-chloro-4-iodocyclohexane is reacted with 1 equiva
    5·1 answer
  • How does the electrical force relate to the distance between two charged objects?
    6·2 answers
  • What is the broad name for movement of materials across a membrane
    7·1 answer
  • What is the velocity baseball field to school
    14·1 answer
  • Which term identifies the half-reaction that occurs at the anode of an operating electrochemical cell?
    10·1 answer
  • Can someone explain to me what numbers are acidic, base, or neutral on a ph scale?
    10·1 answer
  • How many bonds would be needed when bonding 2 atoms of nitrogen to achieve a full octet for both atoms?
    10·1 answer
  • What happends to particles in matter when matter gains heat?
    8·2 answers
  • when you receive fluid in the hospital, it is often 0.9% saline solution. what would happen if the nurse used distilled water in
    13·1 answer
  • Use significant digits to express the weight of a 150.0 lb person in kilograms ( 1 lb = 453.6 g)
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!