How Much Heat is Needed to Convert Ice at -10C to Steam at 110C?

  • Thread starter Thread starter bommie
  • Start date Start date
  • Tags Tags
    Thermochemistry
AI Thread Summary
To convert 20.0g of ice at -10°C to steam at 110°C, several steps are required, each involving specific heat calculations. First, heat must be added to raise the temperature of the ice to 0°C, followed by the heat needed to melt the ice into liquid water. Next, the water must be heated to 100°C, then vaporized into steam, and finally, the steam is heated to 110°C. Each phase change and temperature increase requires specific calculations using the given specific heats and heat values for fusion and vaporization. Understanding these steps is crucial for accurately determining the total heat required for the transformation.
bommie
Messages
1
Reaction score
0
How much heat (in joules) must be added to change 20.0g of H2O(s) at -10C to steam at 110C? The specific heat of H2O(s) is 2.09 J/gC; of H2O(L) is 4.184 J/gC; and of H2O(g) is 1.84 J/gC. The heat fusion of water is 334.7 J/g and the heat vaporization of water is 2259.4J/g.I feel like we have to find the temp for s ---> l and then l ---> g. But I'm completely lost; I don't understand Thermochemistry.
 
Physics news on Phys.org
Split it into separate parts - you have to warm up ice till it can be melted, you have to melt it, you have to warm the the water till boiling point, you have to boil it, you finally have to warm up steam. Then add everything.

--
methods
 
Thread 'Confusion regarding a chemical kinetics problem'
TL;DR Summary: cannot find out error in solution proposed. [![question with rate laws][1]][1] Now the rate law for the reaction (i.e reaction rate) can be written as: $$ R= k[N_2O_5] $$ my main question is, WHAT is this reaction equal to? what I mean here is, whether $$k[N_2O_5]= -d[N_2O_5]/dt$$ or is it $$k[N_2O_5]= -1/2 \frac{d}{dt} [N_2O_5] $$ ? The latter seems to be more apt, as the reaction rate must be -1/2 (disappearance rate of N2O5), which adheres to the stoichiometry of the...
I don't get how to argue it. i can prove: evolution is the ability to adapt, whether it's progression or regression from some point of view, so if evolution is not constant then animal generations couldn`t stay alive for a big amount of time because when climate is changing this generations die. but they dont. so evolution is constant. but its not an argument, right? how to fing arguments when i only prove it.. analytically, i guess it called that (this is indirectly related to biology, im...
Back
Top