Skip to main content

How many joules are required to heat 200.0 grams of water from 25 degrees C to 125 degrees C?

There are a number of steps involved in heating water from 25 degrees C (298 degrees K) to 125 degrees C (398 degrees K). Water turns into steam (gas phase) at 100 degrees C (373 degrees K). The steam will then be heated from 100 degrees C to 125 degrees C. These are the steps involved in calculation:


1.) Heating water from 25 degrees C to 100 degrees C:


Energy needed = mass of water...

There are a number of steps involved in heating water from 25 degrees C (298 degrees K) to 125 degrees C (398 degrees K). Water turns into steam (gas phase) at 100 degrees C (373 degrees K). The steam will then be heated from 100 degrees C to 125 degrees C. These are the steps involved in calculation:


1.) Heating water from 25 degrees C to 100 degrees C:


Energy needed = mass of water x specific heat capacity of water x temperature change = 200 g x 4.184 J/g/K x (373 - 298) K = 62,760 J.


(note that 75 degrees C increase in temperature is same as 75 K change).


2.) Evaporation of water or conversion to steam:


Energy needed = mass of water x latent heat of evaporation 


= 200 g x 2259 J/g = 451,800 J


3.) Heating steam from 100 degrees C to 125 degrees C:


energy needed = mass of steam x specific heat capacity of steam x temperature change 


= 200 g x 2.02 J/g/K x (398-373) K


= 10,100 J


Thus, the total energy needed = 62,760 + 451,800 + 10,100 


= 524,660 J or 524.66 kJ.


Hope this helps.







Comments

Post a Comment

Popular posts from this blog

What is the meaning of "juggling fiends" in Macbeth?

Macbeth is beginning to realize that the three witches have been deceiving him since he first encountered them. Like jugglers, they have kept changing their forecasts in order create confusion. This is particularly apparent when the Second Apparition they raise in Act IV,   Scene 1 tells him that no man of woman born can overcome him in hand-to-hand battle--and then Macbeth finds himself confronted by the one man he has been avoiding out of a... Macbeth is beginning to realize that the three witches have been deceiving him since he first encountered them. Like jugglers, they have kept changing their forecasts in order create confusion. This is particularly apparent when the Second Apparition they raise in Act IV,   Scene 1 tells him that no man of woman born can overcome him in hand-to-hand battle--and then Macbeth finds himself confronted by the one man he has been avoiding out of a sense of guilt, and that man tells him: Despair thy charm. And let the angel whom thou still hast serve...
Post a Comment
Read more

Discuss movements that were inspired by the Civil Rights Movement and list one success for each group.

African-Americans contributed in a very big way during World War II. These contributions were demonstrated at home and on the battlefield. After the war, African-Americans properly felt it was time for them to achieve equality with white Americans. During the 1950's, the modern Civil Rights Movement was born and it had a number of successes (integration of the military and Brown vs. Board of Education as examples.) This success inspired other activists to demand change... African-Americans contributed in a very big way during World War II. These contributions were demonstrated at home and on the battlefield. After the war, African-Americans properly felt it was time for them to achieve equality with white Americans. During the 1950's, the modern Civil Rights Movement was born and it had a number of successes (integration of the military and Brown vs. Board of Education as examples.) This success inspired other activists to demand change for their agendas. Two examples of moveme...
Post a Comment
Read more

In Martel's Life of Pi, how does writing a diary help Pi Patel build on his leadership skills?

At the end of chapter 73, Pi first divulges the fact that he had started a diary after about a week alone at sea. Pi claims that he wrote about "practical stuff" (208) such as what he caught for food, foreseeable problems and solutions, Richard Parker, and reflections about specific events that occurred. In a sense, Pi is the captain of his ship; therefore, he must take responsibility for himself and his crew. He can... At the end of chapter 73, Pi first divulges the fact that he had started a diary after about a week alone at sea. Pi claims that he wrote about "practical stuff" (208) such as what he caught for food, foreseeable problems and solutions, Richard Parker, and reflections about specific events that occurred. In a sense, Pi is the captain of his ship; therefore, he must take responsibility for himself and his crew. He can do this by writing down events, problems and solutions, and reflections to look back on when confronted with repeated problems. It can ...
Post a Comment
Read more