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
kumpel [21]
3 years ago
8

How much heat is released when 105g of steam at 100.0C is cooled to ice at -15C? Enthalpy of vaporization of water is 40.67kj/mo

l, the enthalpy of fusion of water is 6.01kj/mol, the molar heat capacity of water is 75.4J/(mol.C) and the molar heat capacity of ice is 36.4J/(mol.C)
Chemistry
2 answers:
densk [106]3 years ago
4 0

Answer:

4909.486Kj/mol

Explanation:

the heat would be required to change steam at 100°c to water at 100°c then change the water at that temperature to water at 0°c then change water at 0°c to ice at 0°c then ice at 0°c to ice at -15°c

Anika [276]3 years ago
4 0

Answer : The heat released is, 319.28 kJ

Solution :

The conversions involved in this process are :

(1):H_2O(g)(100^oC)\rightarrow H_2O(l)(100^oC)\\\\(2):H_2O(l)(100^oC)\rightarrow H_2O(l)(0^oC)\\\\(3):H_2O(l)(0^oC)\rightarrow H_2O(s)(100^oC)\\\\(4):H_2O(s)(0^oC)\rightarrow H_2O(s)(-15^oC)

Now we have to calculate the enthalpy change.

\Delta H=n\times \Delta H_{condensation}+[n\times c_{p,l}\times (T_{final}-T_{initial})]+n\times \Delta H_{freezing}+[n\times c_{p,s}\times (T_{final}-T_{initial})]

where,

\Delta H = enthalpy change = ?

Mass of water = 105 g

Moles of water = \frac{\text{Mass of water}}{\text{Molar mass of water}}=\frac{105g}{18g/mole}=5.83mole

c_{p,s} = specific heat of solid water = 36.4J/(mol.^oC)

c_{p,l} = specific heat of liquid water = 75.4J/(mol.^oC)

\Delta H_{freezing} = enthalpy change for freezing = enthalpy change for fusion = - 6.01 KJ/mole = - 6010 J/mole

\Delta H_{condensation} = enthalpy change for condensation = enthalpy change for vaporization = -40.67 KJ/mole = -40670 J/mole

Now put all the given values in the above expression, we get

\Delta H=5.83mole\times -40670J/mole+[5.83mole\times 75.4J/(mol.^oC)\times (0-100)^oC]+5.83mole\times -6010J/mole+[5.83mole\times 36.4J/(mol.^oC)\times (-15-0)^oC]

\Delta H=-319285.78J=-319.28KJ     (1 KJ = 1000 J)

Negative sign indicates that the heat is released during the process.

Therefore, the heat released is, 319.28 KJ

You might be interested in
Draw the product formed when the compound shown below undergoes a reaction with hcl in ch2cl2.
Taya2010 [7]
 The product formed  when HCl and CH2Cl2 react  is   CH4
         H
     H-C- H    methane structure 
         H

  HCl    react with CH2Cl2  to form  methane (CH4) and chlorine gas(Cl2)
that is,

2HCl(g)  + CH2Cl2(l)  = CH4 (g) +2Cl2 (g)
6 0
3 years ago
Which metals may be oxidized by H+ under standard-state conditions? Ag+(aq) + e– → Ag(s) E° = 0.80 V Cu2+(aq) + 2e– → Cu(s) E° =
Debora [2.8K]
Answer is: tin and zinc, because they standard potential as less than zero.
Tin and zinc are oxidized to tin and zinc cations (with +2 charge) and hydrogen anions are reduced to hydrogen molecules with neutral charge.
Zn → Zn²⁺ + 2e⁻; 2H⁺ + 2e⁻ → H₂.
<span>Oxidation is increase of oxidation number  and reduction is decrease of oxidation number.</span>
8 0
3 years ago
Where are electrons found in an atom
dedylja [7]

Answer:

The electrons are found on the outer shell of the atom.

Explanation:

6 0
2 years ago
#1: At STP, how many molecules of nitrogen gas are in 22.4 L?
OLEGan [10]

At STP, 1 mol = 22.4

1 mol = 6.022 X 10^ 23

so your answer is right it is B 6.022 X 10^ 23

3 0
3 years ago
Please need me know! Chem question
Inessa [10]
90 degrees
As temperature increases, rate of reaction increases :)
5 0
3 years ago
Other questions:
  • Destruction of mountains can lead to what
    7·1 answer
  • Using the periodic tables, identify the heaviest member of each of the following groups:
    5·1 answer
  • Which group on the periodic table contains only metals?
    5·1 answer
  • A sample of gas has an initial volume of 25 L and an initial pressure of 3.5 Pa. If the pressure changes to 1.3 Pa, find the new
    10·1 answer
  • What is the atomic number and weight of Potassium?
    10·1 answer
  • Consider X + Z -&gt; ?
    15·1 answer
  • Pretend your friend was absent from class today...
    10·2 answers
  • Two disadvantages to deforestation
    6·2 answers
  • Draw the Lewis structure for SO2. How
    11·1 answer
  • Which statement describes what happens when somebody slaps their hand on a wall?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!