Question

21. The initial temperature of an iron block of unknown mass is 83 oC. The iron...

21. The initial temperature of an iron block of unknown mass is 83 oC. The iron block is cooled by dropping it into an insulated container that contains 73 Liters of water at 23 oC. After reaching thermal equilibrium, the final temperature of the iron block and water is measured as 39 oC.  If the total entropy change for this process is 2.5 kJ/oK, determine the mass of the iron in kg. The specific heat for iron is 0.448 kJ/kg-oK and the specific heat for water is 4.184 kJ/kg-oK. The density of iron is 7840 kg/m3 and the density of water is 1000 kg/m3.

State your answer to whole numbers. Example: 615

I WILL RATE YOU

Engineering   Mechanical-Engineering   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A block of ice, mass 0.98 kg and initial temperature of -12 oC, is placed in...
A block of ice, mass 0.98 kg and initial temperature of -12 oC, is placed in an insulating container. 2.57 kg of water at temperature 18 oC, is added to the container. The water and ice exchange heat, but no other heat flows into or out of the container. In the process of the water and ice reaching equilibrium, how much ice melts? Give your answer in kg to three digits. Note: It is possible that the answer is zero.
A 50 kg copper block initially at 350 oC is quenched in a closed, rigid insulated...
A 50 kg copper block initially at 350 oC is quenched in a closed, rigid insulated tank containing 120 L of liquid water at 25 oC. Specific heat of copper, Cc = 385 J/(kgK), specific heat of liquid water, Cw = 4180J/(kgK). (i) Calculate the entropy change (kJ/K) of copper block. (ii) Determine the entropy change (kJ/K) of liquid water.
A 2.50-kg block of hot iron (cFe = 0.45 J/g K; Tin = 300. oC) is...
A 2.50-kg block of hot iron (cFe = 0.45 J/g K; Tin = 300. oC) is dropped in cold water (Tin = 20 oC) to cool quickly. 1) how much heat needs to be absorbed to cool the iron block to 25 oC? A) 309 J B) 309 kJ C) 618 J D) 618 kJ E) None of the above 2) How much cold water will be needed? A) 14.8 g B) 14.8 kg C) 14.8 m3 D) 14,800 L...
In a steel plant, a 25g block of iron at 175 oC is dropped into 1...
In a steel plant, a 25g block of iron at 175 oC is dropped into 1 L of water at 20oC in an insulated flask at atmospheric pressure. Calculate the final temperature of the system. The specific heat of iron is given by: ? (J/g) = 17.3T, where T is in oC
A block of copper has a mass of 100 kg and an initial temperature of 900...
A block of copper has a mass of 100 kg and an initial temperature of 900 K. Copper can be modeled as an incompressible substance with a specific heat capacity of 0.4 kJ/kg-K. a.) The copper block is dropped into a large lake at 300 K and allowed to come to thermal equilibrium. How much entropy is generated (kJ/K)? b.) If a reversible heat engine were connected between the lake and the copper block and operated until the temperature of...
A 60.0 g aluminum block, initially at 55.00 °C, is submerged into an unknown mass of...
A 60.0 g aluminum block, initially at 55.00 °C, is submerged into an unknown mass of water at 293.15 K in an insulated container. The final temperature of the mixture upon reaching thermal equilibrium is 25.00 °C. What is the approximate mass of the water? The specific heat of water is 4.18 J/g . °C. The specific heat of aluminum is 0.897 J/g . °C.
A block of ice of mass 0.9 kg and initial temperature T = 0 oC is...
A block of ice of mass 0.9 kg and initial temperature T = 0 oC is placed in a sealed insulated container full of Helium gas, initially at temperature 220 oC and pressure of 1 atm.   The volume of the Helium is 680 L, and is constant. Helium is a monatomic ideal gas. What is the mass of the liquid water when the system comes to equilibrium? (In other words, how much ice melts?) Assume no heat is lost to...
A cooper block having a mass of 10 kg and at a temperature of 800 K...
A cooper block having a mass of 10 kg and at a temperature of 800 K is placed in a well-insulated vessel containing 100 kg of water initially at 290 K. Calculate: a) Calculate the entropy change for the block, the water, and the total process. b) What is the maximum amount of work that could have been obtained from the copper block and water in a Carnot engine? The heat capacities are 4.185 kJ/kg/K for water and 0.398 kJ/kg/K...
Part A A copper pot of mass 2.5 kg contains 5.2 litres of water (i.e. 5.2...
Part A A copper pot of mass 2.5 kg contains 5.2 litres of water (i.e. 5.2 kg) at room temperature (200C). An iron block of mass 9.4 kg is dropped into the water and when the system comes into thermal equilibrium, a temperature of 380C is measured. What is the initial temperature of the iron block? Give your answer in oC to three significant figures. Part B Iron has a specific heat that is larger than that of copper. A...
An iron boiler of mass 180 kg contains 770 kg of water at 21 ∘C. A...
An iron boiler of mass 180 kg contains 770 kg of water at 21 ∘C. A heater supplies energy at the rate of 58,000 kJ/h. The specific heat of iron is 450 J/kg⋅C∘, the specific heat of water is 4186 J/kg⋅C∘, the heat of vaporization of water is 2260 kJ/kg⋅C∘. Assume that before the water reaches the boiling point, all the heat energy goes into raising the temperature of the iron or the steam, and none goes to the vaporization...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT