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
Gre4nikov [31]
3 years ago
12

In the previous question you were provided with an extra piece of information: you were told that only liquid water would be pre

sent once equilibrium was established. if the final state of a system is not given, it is still possible to determine it from the initial temperatures and masses. the next few parts will help illustrate this point. suppose that in an insulated container, 0.100 kg of water at 20.0∘c is mixed with 1.500kg of ice at −15.0∘c. you are asked to find the final temperature tf of the system, but you are not told what the final phase of the system in equilibrium is.
Chemistry
1 answer:
san4es73 [151]3 years ago
8 0

Answer:   
 Latent heat fusion of water, hf = 334 kJ/kg 
 specific heat of water is 4.186 kJ·kgâ’1·Kâ’1 
 specific heat of ice is 2.05 kJ/kgK 
  
 First, lets assume the ice will melt and become liquid water 
 Q in = Q out 
 m1*C(ice)*(0 deg C- (-) 15) + m1*hf + m1*C(water) (Tf - 0))= m2*C(water)*
(T2 - Tf) 
 1.5* 2.05*15 + 1.5*334 + 1.5*4.186*Tf = 0.1*4.186 (20 - Tf) 
 46.125 + 501 + 6.279 Tf = 0.4186 (20 - Tf)... (1)   
 For water if it decrease to 0 deg C, the energy as heat release is 0.4186 (20
- 0) = 8.372 kJ < 46.125 kJ, Lower than Ice which increase temperature from
-10 to zero. So Water will become ice.   
 The energy dissipate for 20 deg C water and change its phase to 0 deg C ice
is still lower than energy absorb by ice to 0 deg C, rearrange the equation.   
 Q in = Q out 
 m1*C(ice)*(Tf- (-) 15) = m2*C(water)*(T2 - 0) + m2*hf + m2*c(ice) (0-Tf) 
 1.5* 2.05* (Tf +15) = 0.4186*20 + 0.1*334 + 0.1*2.05 (-Tf) 
 3.075 (Tf + 15) = 8.372 + 33.4 + 0.205 (-Tf) 
 3.075Tf + 46.125 = 41.772 - 0.205 Tf 
 3.28 Tf = - 4.353 
 Tf = - 1.327 deg C ( Ice phase)
You might be interested in
In a hospital laboratory, a 10.0 mL sample of gastric juice (predominantly HCl), obtained several hours after a meal, was titrat
LiRa [457]

Answer: 1.14

Explanation:

HCl+NaOH\rightarrow NaCl+H_2O

To calculate the molarity of acid, we use the equation given by neutralization reaction:

n_1M_1V_1=n_2M_2V_2

where,

n_1,M_1\text{ and }V_1 are the n-factor, molarity and volume of acid which is HCl

are the n-factor, molarity and volume of base which is NaOH.

We are given:

n_1=1\\M_1=?\\V_1=10.0mL\\n_2=1\\M_2=0.1M\\V_2=7.2mL

Putting values in above equation, we get:

1\times M_1\times 10.0=1\times 0.1\times 7.2\\\\M_1=0.072M

To calculate pH of gastric juice:

molarity of H^+ = 0.072

pH=-log[H^+]

pH=-log(0.072)=1.14

Thus the pH of the gastric juice is 1.14

3 0
3 years ago
How much heat is absorbed in the complete reaction of 3.00 grams of SiO2 with excess carbon in the reaction SiO2(g) + 3C(s) → Si
defon

Answer:

31.24 kJ

Explanation:

  • SiO₂(g) + 3C(s) → SiC(s) + 2CO(g)        ΔH° = 624.7 kJ/mol

First we <u>convert 3.00 grams of SiO₂ to moles</u>, using its <em>molar mass</em>:

  • 3.00 g SiO₂ ÷ 60.08 g/mol = 0.05 mol

Now we <u>calculate the heat absorbed</u>, using the <em>given ΔH°</em>:

If the complete reaction of 1 mol of SiO₂ absorbs 624.7 kJ, then with 0.05 mol:

  • 0.05 mol * 624.7 kJ/mol = 31.24 kJ of heat would be absorbed.
6 0
3 years ago
Abdid is an astronomer who has been observing objects that orbit the Sun in the asteroid belt. He finds a previously undiscovere
Elza [17]
Since it is round and it is the asteroid belt it is most likely that he found a dwarf planet 
6 0
3 years ago
Read 2 more answers
Diamond and graphite are two crystalline forms of carbon. In which form are the bonds between the C atoms arranged at tetrahedra
Fynjy0 [20]

Answer:

The answer is letter A. Diamond

Explanation:

The diamond is a crystalline form of carbon, with a cubic structure, of the sp³ type, that is, each carbon atom of the structure is linked to four other carbon atoms, forming a tetrahedral geometry.

3 0
3 years ago
Which element is similar to the properties bromine?
Ainat [17]

Answer: Fluorine

Explanation: It belongs in the same group as Bromine

8 0
3 years ago
Other questions:
  • An uncharged atom of gold has an atomic number of 79 and an atomic mass of 179. this atom has ________ protons, ______________ n
    8·1 answer
  • In a coffee‑cup calorimeter, 65.0 mL of 0.890 M H 2 SO 4 was added to 65.0 mL of 0.260 M NaOH . The reaction caused the temperat
    14·1 answer
  • Please Help!!
    14·2 answers
  • HS- is amphoteric; it can behave as either an acid or a base.
    13·1 answer
  • Can someone help me solve all of these problems? (Will give brainliest and a heart)
    8·1 answer
  • Using the line spectra below and information from the previous activity, determine which subatomic particles play the biggest ro
    12·1 answer
  • Water is said to be a good solvent for polar solutes because it has a negative end and a positive end. This explains why (IONIC/
    9·1 answer
  • MASTERING CONCEPTS<br> 31. List three examples of substances. Explain why each<br> is a substance.
    11·1 answer
  • Which statements describe turbidity? Check all that apply. Turbidity is a measure of water clarity. Turbidity may be caused by s
    6·1 answer
  • PLEASE HELPPP ASAPPPP!!!!
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!