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A balloon expands isothermally from 1.0 L to 10.0 L next to a constant external pressure of 7.0 atm. the work done by the system is:
A. -63L.atm.
B. +63 L.atm.
C. -70 L.atm.
D.+ 70 L.atm.
E. Cannot be calculated.
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