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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: Tom on June 29, 2004, 12:34:21 PM

Title: The ^E ?
Post by: Tom on June 29, 2004, 12:34:21 PM

A system was found to absorb 500.0 J of heat from the surroundings and did 25.0 J of work on the surroundings.  Is the ^E for the surroundings 525 J?
   

Title: Re:The ^E ?
Post by: Donaldson Tan on June 29, 2004, 03:03:59 PM

what does ^E refer to? I'm not sure of your notation. All I know is:

change in energy of system = change in energy of surroundings (1st law)

Title: Re:The ^E ?
Post by: Tom on June 29, 2004, 03:43:16 PM

The ^ is suppose to be a triangle or represent "delta"

Title: Re:The ^E ?
Post by: Mitch on June 29, 2004, 03:54:04 PM

I would of suspected 475J.

Title: Re:The ^E ?
Post by: Donaldson Tan on June 29, 2004, 05:30:31 PM

Quote from: Mitch on June 29, 2004, 03:54:04 PM

I would of suspected 475J.

dQ = dU + W

500 = dU + 25

dU = +475

With reference to first law, ie;. change in energy of system = change in energy of surroundings, ^E for the surroundings is thus +475 too.

Title: Re:The ^E ?
Post by: Tom on June 30, 2004, 08:36:18 AM

Thanks, I unerstand were I fouled up! I appreciate your assistnce in checking my answer.