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Topic: Simple problem involving heat that I can't figure out.  (Read 6371 times)

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Offline pantsaregood

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Simple problem involving heat that I can't figure out.
« on: February 08, 2009, 07:22:50 PM »
How much heat (in kilojoues) is needed to convert 866g of ice at -10C to steam at 126C? (The specific heats of ice and steam are 2.03J/g*C and 1.99 J/g*C, respectively.

The answer is 2670 kJ. It doesn't explain the answer at all. The only equations I'm provided are Hess's Law and the Clausius-Clapeyron equation. Simply put, I can't figure out how to apply either here.

Offline ARGOS++

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Re: Simple problem involving heat that I can't figure out.
« Reply #1 on: February 08, 2009, 07:31:55 PM »

Dear pantsaregood;

Please try to understand the following thread and use it as a guide to your problem:

There are similar threads on the forum too, also a copy of your problem.
Please search for them.

Good Luck!
                    ARGOS++

Offline ARGOS++

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Re: Simple problem involving heat that I can't figure out.
« Reply #2 on: February 08, 2009, 07:44:20 PM »
Dear pantsaregood;

Missing values/constants you may get from the header above the table: 

I hope to have been of help to you.
Good Luck!
                    ARGOS++

Offline pantsaregood

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Re: Simple problem involving heat that I can't figure out.
« Reply #3 on: February 08, 2009, 07:57:09 PM »
Even after looking at this I have no idea where to go. The book doesn't contain an explanation of a problem like this, and I completely fail to see how to apply either of the equations provided on this problem.

Offline ARGOS++

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Re: Simple problem involving heat that I can't figure out.
« Reply #4 on: February 08, 2009, 08:20:21 PM »

Offline ARGOS++

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Re: Simple problem involving heat that I can't figure out.
« Reply #5 on: April 29, 2009, 07:27:24 PM »
                             Copy of lost replay No. 4

Dear pantsaregood;

Calculate all Heat’s stepwise and finally summarise them!

Use the following recipe combined with the links I gave you:
    A.)      Heat the Ice from -10°C to 0°C.
    B.)      Melt the Ice to water of 0°C.
    C.)      Heat the water to 100°C.
    D.)      Convert the water to steam of 100°C
    E.)      Heat now the steam to 126°C
    F.)      Summaries all calculated Heat’s together.

I hope you know the basic formula of heat.
Good Luck!
                    ARGOS++

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