I want to thank your team (Jeff) for finding a new writer when you were unable to reach my existing writer to revise my paper. I appreciate your professionalism and efforts. Thanks
Report (any type)/Brief report
22/09/2021
##DeltaS = -“238 J K”^(-1)##
The first thing to notice here is that you’re dealing with a vapor to liquid , so right from the start you should expect the change in , ##DeltaS##, to be negative.
This is the case because you’re going from higher disorder and randomness, as you get in the gaseous state, to lower disorder and randomness, as you get in the liquid state.
So the entropy of the system is decreasing, i.e. it’s going from higher disorder to lower disorder.
Next, notice that the problem tells you that the change in entropy must be expressed in joules per Kelvin, ##”J K”^(-)##. This lets you know that you’re essentially looking for two things here
The molar heat of vaporization tells you how much heat is released when ##1## mole of water vapor condenses at its boiling point, which is ##100.0^@”C”## at normal pressure, to form ##1## mole of liquid water.
In your case, you have
##DeltaH_”vap” = “40.67 kJ mol”^(-1)##
This tells you that when ##1## mole of water goes from vapor at its boiling point to liquid at its boiling point, ##”40.76 kJ”## of heat are being given off.
Use water’s molar mass to calculate how many moles of water you have in your sample
##39.3 color(red)(cancel(color(black)(“g”))) * (“1 mole H”_2″O”)/(18.015color(red)(cancel(color(black)(“g”)))) = “2.182 moles H”_2″O”##
Use the molar hear of vaporization to find how much heat is being given off here
##2.182 color(red)(cancel(color(black)(“moles H”_ 2″O”))) * overbrace(“40.76 kJ”/(1color(red)(cancel(color(black)(“mole H”_ 2″O”)))))^(color(blue)(DeltaH_ “vap”)) = “88.94 kJ”##
Now, the trick here is to realize that heat given off is associated with a negative change in , ##DeltaH##. You can thus say that when ##”88.94 kJ”## of heat are being given off, the change in enthalpy is
##DeltaH = – “88.94 kJ”##
Expressed in joules, this will be equal to
##-88.94 color(red)(cancel(color(black)(“kJ”))) * (10^3″J”)/(1color(red)(cancel(color(black)(“kJ”)))) = -“88,940 J”##
Next, convert the temperature at which the phase change takes places from Celsius to Kelvin by using the conversion factor
##color(purple)(|bar(ul(color(white)(a/a)color(black)(T[“K”] = t[“”^@”C”] + 273.15)color(white)(a/a)|)))##
You will have
##T = 100.0^@”C” + 273.15 = “373.15 K”##
Now, the equation that connect change in entropy, change in enthalpy, and absolute temperature looks like this
##color(blue)(|bar(ul(color(white)(a/a)DeltaS = (DeltaH)/Tcolor(white)(a/a)|)))##
Plug in your values to find
##DeltaS = (-“88,940 J”)/”373.15 K” = color(green)(|bar(ul(color(white)(a/a)color(black)(-“238 J K”^(-1))color(white)(a/a)|)))##
The answer is rounded to three .
I want to thank your team (Jeff) for finding a new writer when you were unable to reach my existing writer to revise my paper. I appreciate your professionalism and efforts. Thanks
Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.
You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.
Read moreEach paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.
Read moreThanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.
Read moreYour email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.
Read moreBy sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.
Read more