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
An element or compound which occurs naturally in the earth is a ___?
Rzqust [24]
An element or compound which occurs naturally in the earth is a mineral
5 0
2 years ago
Read 2 more answers
Which of the following statements best describes the body processes alcohol
Nana76 [90]
<span>After alcohol is metabolized in the liver, it is burned as fuel for the cells. </span>
5 0
3 years ago
Read 2 more answers
The specific heat of aluminum is 0.897 J/g•°C. Which equation would you use to calculate the amount of heat needed to raise the
docker41 [41]
Q = 0.75 g x 0.897 J/g•°C x 22°C
6 0
3 years ago
One of your chores is to mow the lawn. The lawnmower runs on gasoline. The gasoline
trasher [3.6K]

B

Explanation:

Burning is a chemical change and cutting grass is a physical change

7 0
3 years ago
Read 2 more answers
Are plants and animal pH sensitive?​
Rudiy27

Answer:

Plants and animals are pH sensitive. The growth of plants is dependent on the nature of the soil. If the pH of the soil is greater than 7 and is alkaline, then the plants cannot grow in the soil.

Explanation:

6 0
3 years ago
Other questions:
  • Describe in detail what you know about the enthalpy, entropy, and free energy changes when a sample of gas condenses to a liquid
    11·2 answers
  • BRAINLIEST ANSWER! PLEASE HELP!! An Earth-like planet is 500 light years away. Why is this an obstacle for a manned space missio
    8·1 answer
  • The rate constant for a particular second-order reaction is 0.47 M-1s-1. If the initial concentration of reactant is 0.25 mol/L,
    6·1 answer
  • Why is it important to predict consequences when decision-making?
    10·1 answer
  • PLEASE HELPPPP what characteristics of the bond you choose are persent in H2O.​
    15·1 answer
  • Is a instant cold pack Endothermic or Exothermic reaction? Explain.
    14·1 answer
  • A solution is prepared by dissolving 15.0 g of NH3 in 250.0 g of water. The density of the resulting solution is 0.974 g/mL. The
    9·1 answer
  • Write a procedure for "how to crack an egg" in cooking. You must have at least 3 steps. The format of your procedure is more imp
    14·1 answer
  • A student hits a nail with a hammer. During the collision, there is _____.
    6·1 answer
  • I NEED HELP ASAP!!!!!! LIKE RIGHT NOW PLEASE HELP!!!!! TwT
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!