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
Elden [556K]
2 years ago
14

What is the quantity of heat (in kJ) associated with cooling 185.5 g of water from 25.60°C to ice at -10.70°C?Heat Capacity of S

olid = 2.092 J/g°CHeat Capacity of Liquid = 4.184 J/g°CT Fusion = 0.00 °CΔH Fusion = 6.01 kJ/mol
Chemistry
1 answer:
Cerrena [4.2K]2 years ago
7 0

Taking into account the definition of calorimetry, sensible heat and latent heat,  the amount of heat required is 37.88 kJ.

<h3>Calorimetry</h3>

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

<h3>Sensible heat</h3>

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

<h3>Latent heat</h3>

Latent heat is defined as the energy required by a quantity of substance to change state.

When this change consists of changing from a solid to a liquid phase, it is called heat of fusion and when the change occurs from a liquid to a gaseous state, it is called heat of vaporization.

  • <u><em>25.60 °C to 0 °C</em></u>

First of all, you should know that the freezing point of water is 0°C. That is, at 0°C, water freezes and turns into ice.

So, you must lower the temperature from 25.60°C (in liquid state) to 0°C, in order to supply heat without changing state (sensible heat).

The amount of heat a body receives or transmits is determined by:

Q = c× m× ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

  • c= Heat Capacity of Liquid= 4.184 \frac{J}{gC}
  • m= 185.5 g
  • ΔT= Tfinal - Tinitial= 0 °C - 25.60 °C= - 25.6 °C

Replacing:

Q1= 4.184 \frac{J}{gC}× 185.5 g× (- 25.6 °C)

Solving:

<u><em>Q1= -19,868.98 J</em></u>

  • <u><em>Change of state</em></u>

The heat Q that is necessary to provide for a mass m of a certain substance to change phase is equal to

Q = m×L

where L is called the latent heat of the substance and depends on the type of phase change.

In this case, you know:

n= 185.5 grams× \frac{1mol}{18 grams}= 10.30 moles, where 18 \frac{g}{mol} is the molar mass of water, that is, the amount of mass that a substance contains in one mole.

ΔHfus= 6.01 \frac{kJ}{mol}

Replacing:

Q2= 10.30 moles×6.01 \frac{kJ}{mol}

Solving:

<u><em>Q2=61.903 kJ= 61,903 J</em></u>

  • <u><em>0 °C to -10.70 °C</em></u>

Similar to sensible heat previously calculated, you know:

  • c = Heat Capacity of Solid = 2.092 \frac{J}{gC}
  • m= 185.5 g
  • ΔT= Tfinal - Tinitial= -10.70 °C - 0 °C= -10.70 °C

Replacing:

Q3= 2.092 \frac{J}{gC} × 185.5 g× (-10.70) °C

Solving:

<u><em>Q3= -4,152.3062 J</em></u>

<h3>Total heat required</h3>

The total heat required is calculated as:  

Total heat required= Q1 + Q2 +Q3

Total heat required=-19,868.98 J + 61,903 J -4,152.3062 J

<u><em>Total heat required= 37,881.7138 J= 37.8817138 kJ= 37.88 kJ</em></u>

In summary, the amount of heat required is 37.88 kJ.

Learn more about calorimetry:

brainly.com/question/14057615?referrer=searchResults

brainly.com/question/24988785?referrer=searchResults

brainly.com/question/21315372?referrer=searchResults

brainly.com/question/13959344?referrer=searchResults

brainly.com/question/14309811?referrer=searchResults

brainly.com/question/23578297?referrer=searchResults

You might be interested in
6 moles of H2O is equal to how many molecules?
alexandr1967 [171]
6 miles of H2O is equal to 12 Hydrogen molecules and 6 oxygen molecules. Equaling 18 in total.
5 0
3 years ago
Write down the group numbers for carbon,oxygen,nitrogen and sulphur <br>​
Bess [88]

Answer:

Carbon - 14

Oxygen - 16

Nitrogen - 15

Sulphur - 16

Explanation:

The question above is related to the "Periodic Table of Elements" which shows the proper arrangement of elements in a table. Every element falls on a<em> group/family</em> within the table. Each group has its own number, and the table has a total of<u> 18 groups</u><em> (from left to right). </em>They are classified according to <em>similarities in their characteristics</em>. For example, group 1 is composed of <em>alkali metals</em> while group 2 is composed of<em> alkali earth metals</em>.

5 0
3 years ago
Which of the following characteristics is the kinetic molecular theory based on? Matter does not have motion. All matter is in c
solmaris [256]

Answer:

All matter is in continual random motion.

Explanation:

Because Kinetic Molecular theory is based on a principle idea that tiny particles such as gas particles are always in motion.

4 0
3 years ago
I need to know the answer for number two. * I
snow_lady [41]

Answer:

The answer to your question is (C). I would work out the question for you lad, but I don't know how to do it on here.

Explanation:

7 0
3 years ago
A 8 kg pumpkin accelerates through the air at 2 m/s2 before smashing into the ground. How much force was required to get it into
jekas [21]
Would it be 8 divided by 2 so 4? That seems like the most logical way to get answer for this although I don’t quite know the process of whatever your doing so I could be wrong.
7 0
2 years ago
Other questions:
  • A gold nugget has a density of 38.6g/cm3 and a mass of 270.2. what is its volume?​
    5·2 answers
  • Which of the following describes a neutral atom of oxygen? (1 point)6 protons, 6 neutrons, 6 electrons 6 protons, 6 neutrons, 8
    9·2 answers
  • One mole of N2 gas at STP will occupy what volume?
    11·2 answers
  • Which of the following combines with harmful gases to create air pollution?
    11·1 answer
  • All the elements of a family in the periodic table have what feature in common? A) They all have similar chemical properties. B)
    7·2 answers
  • Pro<br>∆G0=-RT in k Known as​
    7·1 answer
  • I gave brainlest:: answer this .....​
    6·1 answer
  • PLEASE HELP: 60 POINTS
    14·2 answers
  • Although chemical digestion occurs throughout the digestive system, it mostly occurs in the A esophagus and stomach
    7·1 answer
  • How should you add metal to the graduated cylinder so that it will not crack the glass at the bottom?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!