P1 = 475 torr
P2 = 900 torr
V1 = 1500 mL
V2 = ?
Applying Boyle's Law
P1V1 = P2V2
475 torr × 1500 mL = 900 torr × V2
V2 = 475 * 1500 mL / 900
V2 = 475*5/3 = 791.6 mL
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