He gas is contained in a one-liter flask that is connected to an empty one-liter flask with a closed stopcock between the two flasks. when the stopcock is opened some of the he enters the evacuated flask. for this system
a. ? h is positive and ? s is negative
b. ? h is zero and ? s is positive
c. ? h is zero and ? s is negative
d. ? h is negative and ? s is positive
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