THERMODYNAMICS INSTRUCTION: ANSWER ALL QUESTIONS & SHOW ALL YOUR WORK METHOD IN DETAILS FOR ALL...

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THERMODYNAMICS      INSTRUCTION: ANSWER ALL QUESTIONS & SHOW ALL YOUR WORK METHOD IN DETAILS FOR ALL THE QUESTION.    Your assignment should be typed using 12 point Times New Roman font and 1.5 line spacing.    QUESTION 1    a) Calculate the amount of energy (in joules) that must be removed from 100 g of water initially at 105ºC in order to completely freeze it. Use the following data:    Specific heat capacity of water = 4190 ,  Specific heat capacity of steam = 2011 ,  Heat of fusion of water = 333  Heat of vapourization of water = 2256      [8 marks] XXXXXXXXXXb) What is the volume of an iron sphere at 20ºC if its volume at 40ºC is 10 cm³?  (The coefficient of linear expansion of copper is )         [7 marks] XXXXXXXXXXQUESTION 2    a)   Two identical objects are placed in a room at 27ºC. Object A has a temperature       of 177ºC and object B has a temperature of 277ºC. Obtain the ratio of the net       power emitted by object A to that of object B.  [5 marks]       XXXXXXXXXXb) An ideal gas of molar mass 30 g/mol is contained in a cylinder of volume 1× The temperature of the gas is 37ºC and its pressure is 2 atm.    i. Calculate the number of molecules of gas present in the cylinder.  ii. Calculate the new pressure of the gas if the volume of the cylinder is halved but the temperature is tripled.  iii. Calculate the density of the gas.     [10 marks]      
	
Document Preview: THERMODYNAMICSINSTRUCTION: ANSWER ALL QUESTIONS  &  SHOW ALL YOUR WORK METHOD IN DETAILS  FOR ALL THE QUESTION.Your assignment should be typed using 12 point Times New Roman font and 1.5 line spacing.		QUESTION 1Calculate the amount of energy (in joules) that must be removed from 100 g of water  initially at 105ºC in order to completely freeze it. Use the following data:Specific heat capacity of water = 4190, Specific heat capacity of steam = 2011, Heat of fusion of water = 333 Heat of vapourization of water = 2256         [8 marks]What is the volume of an iron sphere at 20ºC if its volume at 40ºC is 10 cm³?(The coefficient of linear expansion of copper is)      										        [7 marks]QUESTION 2a)      Two identical objects are placed in a room at 27ºC. Object A has a temperature  XXXXXXXXXXof 177ºC and object B has a temperature of 277ºC. Obtain the ratio of the net  XXXXXXXXXXpower emitted by object A to that of object B. [5 marks]An ideal gas of molar mass 30 g/mol is contained in a cylinder of volume 1× The temperature of the gas is 37ºC and its pressure is 2 atm. i.	Calculate the number of molecules of gas present in the cylinder.ii.	Calculate the new pressure of the gas if the volume of the cylinder is halved but the temperature is tripled.iii.	Calculate the density of the gas.       [10 marks]

Robert · Accepted Answer

QUESTION 1
a) Calculate the amount of energy (in joules) that must be removed from 100 g of water  
initially at 105ºC in order to completely freeze it. Use the following data:
Specific heat capacity of water = 4190 ,  
Specific heat capacity of steam = 2011 ,  
Heat of fusion of water = 333  
Heat of vapourization of water = 2256  
        [8 marks]
Solution: 
 
Water at 105
o
C has to be converted to ice at 0
o
C. 
It will involve following four processes: 
 
a) Steam at 105ºC to steam at 100ºC  
b) Steam at 100ºC to water at 100ºC 
c) Water at 100ºC to water at 0ºC 
d) Water at 0ºC to ice at 0ºC 
 
Now for the process a  
Qa = m*CS*(100-105)  
 
Where m is the mass of water = 100g = 0.1 kg 
Cs is the specific heat capacity of steam = 2011 , 
So, Qa = 0.1*2011*(-5) = -1005.5 J 
 
For the process b 
 
Qb = -m*Lv 
 
Where Lv is the latent heat of vaporization = 2256  
 
\So, Qb = -0.100*2256000 = -225600 J 
 
For the process c 
Qc = m.Cw*(0-100) 
1 1Jkg K 
1 1Jkg K 
1kJ kg
1kJ kg
1 1Jkg K 
1kJ kg
 
Where Cw is the specific heat of water = 4190 ,  
\ 
So, Qc = 0.100*4190*(-100) = -41900 J 
 
For the process d 
Qd = -m.Lf 
 
Where Lf is the latent heat of fusion = 333  
 
So,

THERMODYNAMICS INSTRUCTION: ANSWER ALL QUESTIONS & SHOW ALL YOUR WORK METHOD IN DETAILS FOR ALL THE QUESTION. Your assignment should be typed using 12 point Times New Roman font and 1.5 line spacing....

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