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]
1 year 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]1 year 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
The sink–float method is often used to identify the type of glass material found at crime scenes by determining its density. Sev
Roman55 [17]
Suecagatathqnsu gsgehxhdbbssjjzkzhs
7 0
3 years ago
The diagram below shows the atoms involved in forming table salt. Which statement best describes what happens next ?
Ghella [55]

An ionic compound is composed of ionic bonds that are formed by transfer of electrons from one atom to the other. The atom that loses electrons acquires a positive charge (cation) while that which gains electrons acquires a negative charge.

In the case of sodium chloride; Sodium Na has 1 electron in its outer orbital while Chlorine Cl has 7 electrons. Thus, Cl requires 1 electron to complete its octet. This electron is donated by Na.

Thus, NaCl is essentially, Na⁺Cl⁻

Ans D) Chlorine becomes an anion by gaining an electron from sodium

5 0
3 years ago
Read 2 more answers
Where would we most likely find water in the form of a gas?
KatRina [158]
We are most likely to find water in the form of gas in the atmosphere.
4 0
3 years ago
Read 2 more answers
1. ______is an ion, or molecule that is a proton donor.​
Finger [1]
Brønsted Lowry acid is a proton donor (PD), while a Brønsted-Lowry base is a proton acceptor (PA).

Hopefully this helps
6 0
3 years ago
1. What would happen to the position of equilibrium when the following changes are made to the reaction below? 2Hg3O (g) ↔ 6Hg (
Mademuasel [1]
What is your answer I can help you)
4 0
2 years ago
Read 2 more answers
Other questions:
  • Which quantity is equivalent to 39 grams of LiF?
    11·2 answers
  • Which conditions create a thunder storm? Select three responses.
    11·1 answer
  • Fertilizer runoff has a negative impact on aquatic ecosystems because _______.
    15·2 answers
  • Which of the following substances is most likely to have a pH close to 7?
    8·1 answer
  • Evidence of a chemical reaction includes all of the following EXCEPT: A. baking soda and vinegar release gas bubbles B. while ch
    12·1 answer
  • Which is a property that most nonmetals have in common
    15·2 answers
  • By examining the fossil record, we know that there has been a gradual diversity of species.
    5·1 answer
  • Which element is placed in the same period as ruthenium but has a higher atomic number than it?
    5·1 answer
  • How many significant figures does the number have?<br> 9,000, 100
    11·2 answers
  • The opposite of an endothermic reaction is a(n) reaction.​
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!