Chemistry, 26.09.2019 16:30 costel8532

An insulated thermos contains 150 g of water at 87.3 ˚c. you put in a 10.2 g ice cube at 0.00 ˚c to form a system of ice + original water. the specific heat of liquid water is 4190 j/kg•k; and the heat of fusion of water is 333 kj/kg. what is the net entropy change of the system from then until the system reaches the final (equilibrium) temperature?

Answers: 1

Show answers

Answers

Answer from: stephanieyingepbtcf8

Explanation:

Let us take the equilibrium temperature is T.

Now, the heat absorbed by the ice is equal to the heat lost to the water.

Therefore, the formula will be as follows.

$m_{water} \times C_{water} (T - 87.3) + m_{ice} \times L_{f} + m_{ice} \times C_{water} (T - 0) = 0$

Therefore, putting the given values into the above formula as follows.

$m_{water} \times C_{water} (T - 87.3) + m_{ice} \times L_{f} + m_{ice} \times C_{water} (T - 0) = 0$

$150 g \times 4190 J/kg K (T - 87.3) + 0.0102 kg \times 333 kJ/kg + m_{ice} \times C_{water} (T - 0) = 0$

628500T - 54868050 + 3.3966 + 42.738T = 0

T = $\frac{54868046.6}{628542.738}$

= $87.29^{o}C$

or, = (87.29 + 273.15)K

= 360.44 K

Since, formula for entropy change of ice is as follows.

$\Delta S_{ice} = \frac{m_{ice} \times L_{f}}{T_{ice}} + m_{ice} C ln \frac{T}{T_{melting}}$

= $\frac{0.0102 [\frac{333000}{273.15} + 4190 \times ln (\frac{360.44}{273.15})]$

= $0.0102 \times 2381.015$

= 24.286 J/K

Entropy change for water ( $\Delta S_{water}$ ) = $m_{ice} \times C \times ln (\frac{T}{T_{initial})}$

= $0.0102 \times 4190 \times ln \frac{360.44}{360.45}$

= $-1.186 \times 10^{-3}$ J/K

Therefore, calculate the net change in entropy as follows.

$\Delta S = \Delta S_{water} + \Delta S_{ice}$

= $-1.186 \times 10^{-3} + 24.286$ J/K

= 24.28481 J/K

Thus, we can conclude that the net entropy change of the system from then until the system reaches the final (equilibrium) temperature is 24.28481 J/K.

Answer from: Quest

i believe that it is a exoplanet

Answer from: Quest

question: ray weighs 100 kilograms, his wrestling partner, bobby, weighs 50 kilograms. if ray moves at 4 m s , how fast will bobby have to run at him to apply an equal amount of kinetic energy?

answer: 8 m/s he needs to run twice as fast to keep up so he has some work to do

explanation: if the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

question answered by

(jacemorris04)

Another question on Chemistry

Chemistry, 22.06.2019 17:30

98 points you will be galileo perform the experiment to determine if objects with different mass fall at the same, or different, rates in the air and in a vacuum. before you conduct your experiment, you need to form a hypothesis. a hypothesis is a prediction of what you think will happen in the experiment. the hypothesis is a statement that describes “if” a certain set of circumstances are present “then” there will be a specific result that will occur. record your hypothesis here: record the results from step one of the experiment (dropping the objects in the air): first trial: second trial: third trial: record the results from step two of the experiment (dropping the objects in a vacuum): first trial: second trial: third trial: did the experiment support your hypothesis? using the data from your experiment, describe why you believe your hypothesis was either proven or disproven. what forces were acting on the objects dropped in the air? what force was acting on the objects dropped in the vacuum? part two: comparing forces choose two forces and compare and contrast these forces. you must provide two ways that they are alike and two ways that they are different. you may make a list, write in paragraph form, or make a chart. choose two forces and compare and contrast these forces. these must be different forces than used in the prior question. provide two ways that they are similar and two ways that they are different. you may make a list, write it out, or make a chart.

Answers: 3

Answer

Chemistry, 22.06.2019 18:00

To apply in a gold the individual gold atoms are united to each other by means of a metallic bond. how would you use the gold block to determine the atomic radius of a gold atom?

Answers: 3

Answer

Chemistry, 23.06.2019 00:00

What does an electron configuration for an atom relate to the atoms placement on the periodic table

Answers: 2

Answer

Chemistry, 23.06.2019 01:00

Which elements are found in glucose, the product of photosynthesis? a. carbon, hydrogen, and oxygen b. carbon and hydrogen c. carbon, nitrogen, and oxygen d. hydrogen, nitrogen, and carbon

Answers: 2

Answer

You know the right answer?

An insulated thermos contains 150 g of water at 87.3 ˚c. you put in a 10.2 g ice cube at 0.00 ˚c to...

Questions