1. Like heat, work has the same conventions regarding sign: Work out of the system is negative (w<0) Work into the syste

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1 Like Heat Work Has The Same Conventions Regarding Sign Work Out Of The System Is Negative W 0 Work Into The Syste 1 (71.98 KiB) Viewed 37 times

1. Like heat, work has the same conventions regarding sign: Work out of the system is negative (w<0) Work into the system is positive (w>0) The gas is always the system in chemistry (unlike in physics, where the piston is often the system) Does each system have w>0 or w<0? a. A gas expands against a constant pressure b. A piston compresses a gas. C. Water vapor condenses How much heat is transferred when 100.0 grams of octane (C8H18) reacts with 100.0 grams of oxygen gas. AHrxn = -10,900 kJ (This is the same as om PLQ 7, but I changed the symbol from q to AHrxn to emphasize that you will more likely see AHrxn) 2.