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
Alchen [17]
3 years ago
11

A 13.1-g sample of CaCl2 is dissolved in 104 g of water, with both substances at 24.7°C. Calculate the final temperature of the

solution assuming no heat loss to the surroundings and assuming the solution has a specific heat capacity of 4.18 J °C−1 g−1.
Chemistry
1 answer:
likoan [24]3 years ago
7 0

Answer:

The final temperature of the solution is 44.8 °C

Explanation:

assuming no heat loss to the surroundings, all the heat of solution (due to the dissolving process) is absorbed by the same solution and therefore:

Q dis + Q sol = 0

Using tables , can be found that the heat of solution of CaCl2 at 25°C (≈24.7 °C)  is q dis= -83.3 KJ/mol . And the molecular weight is

M = 1*40 g/mol + 2* 35.45 g/mol = 110.9 g/mol

Q dis = q dis * n  = q dis * m/M =  -83.3 KJ/mol * 13.1 g/110.9 gr/mol = -9.84 KJ

Qdis= -9.84 KJ

Also Qsol = ms * Cs * (T - Ti)

therefore

ms * Cs * (T - Ti) + Qdis = 0

T=  Ti - Qdis * (ms * Cs )^-1   =24.7 °C - (-9.84 KJ/mol)/[(104 g + 13.1 g)* 4.18 J/g°C] *1000 J/KJ

T= 44.8 °C

You might be interested in
g When 2.50 g of methane (CH4) burns in oxygen, 125 kJ of heat is produced. What is the enthalpy of combustion (in kJ) per mole
Anna [14]

Answer:

-800 kJ/mol

Explanation:

To solve the problem, we have to express the enthalpy of combustion (ΔHc) in kJ per mole (kJ/mol).

First, we have to calculate the moles of methane (CH₄) there are in 2.50 g of substance. For this, we divide the mass into the molecular weight Mw) of CH₄:

Mw(CH₄) = 12 g/mol C + (1 g/mol H x 4) = 16 g/mol

moles CH₄ = mass CH₄/Mw(CH₄)= 2.50 g/(16 g/mol) = 0.15625 mol CH₄

Now, we divide the heat released into the moles of CH₄ to obtain the enthalpy per mole of CH₄:

ΔHc = heat/mol CH₄ = 125 kJ/(0.15625 mol) = 800 kJ/mol

Therefore, the enthalpy of combustion of methane is -800 kJ/mol (the minus sign indicated that the heat is released).

3 0
2 years ago
What resources should the scientist use to research water pollution?
Alla [95]
A scientist needs to check several parameters before coming to a conclusion about the amount of water pollution. The scientists needs to check the amount of dissolved oxygen in the water, temperature of the water, the clarity of the water, the PH level of the water and also the amount of bacteria present in the water. There may be other criteria’s, but the mentioned ones are enough to gauge the amount of pollution in the water. Scientists often takes fish and aquatic plants from the water to be tested to check the amount of pollution indirectly affecting these species.



3 0
3 years ago
One mole of copper equals about how many atoms?
Arlecino [84]

One mole of copper equals 6.02 × 10^23 atoms. The answer is letter C. This follows the Avogaro’s law wherein 1 mole of a substance is equal to 6.02 x 10^23 atoms, formula units or molecules. This is applicable to all substances. 

8 0
3 years ago
Read 2 more answers
HELP I HAVE 14 MINUTES!!
ki77a [65]

Answer:

2 one

Explanation:

is right coz I think

4 0
2 years ago
Read 2 more answers
What are sister chromatids
Pavel [41]
Sister chromatids are two identical copies of a single chromosome that are connected by a centromere. They occur as a result of a chromosome that  duplicated during the S phase of the cell cycle.
4 0
3 years ago
Other questions:
  • What is true for all organisms?
    15·1 answer
  • Which activity performed by a chemist is primarily based on an understanding of physics?
    13·2 answers
  • Titration is a type of experiment that can be performed to investigate a neutralization reaction. The equivalence point is when
    11·1 answer
  • Why is it easier to demolish a building than it was to build it
    15·1 answer
  • If the same amount of energy in the form of heat is added to 8.9 g samples of each of the metals below, which metal will undergo
    13·1 answer
  • When 1.187 g of a metallic oxide is reduced with excess hydrogen 1.054 g of the metal is produced. what is the metallic oxide?
    9·2 answers
  • What are items that are cycled through the biosphere in biogeochemical cycles
    8·1 answer
  • Need to finish TODAY ASAP! HIgh point questions
    6·2 answers
  • Snow and ice absorbs much of the Sun's radiant energy<br><br>True or False?​
    15·1 answer
  • How is science based on observation used as evidence? How can this evidence be used?
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!