Answer
(a) 328 mmHg
(b) 2620 mmHg
(c) 475 mmHg
(d) 5240 mmHg
Work Step by Step
1. Conversion factor:
$1 \space L = 1000 \space mL$
2. According to the Boyle's Law:
$$P_1V_1 = P_2V_2 \longrightarrow \frac{P_1V_1}{V_2} = P_2$$
(a) $$P_2 = \frac{(655 \space mmHg)(10.0 \space L)}{20.0 \space L} = 328 \space mmHg$$
(b) $$P_2 = \frac{(655 \space mmHg)(10.0 \space L)}{2.50 \space L} = 2620 \space mmHg$$
(c)
$V_2 = 13800 \space mL \times \frac{1 \space L}{1000 \space mL} = 13.8 \space L$
$$P_2 = \frac{(655 \space mmHg)(10.0 \space L)}{13.8 \space L} = 475 \space mmHg$$
(d)
$V_2 = 1250 \space mL \times \frac{1 \space L}{1000 \space mL} = 1.25 \space L$
$$P_2 = \frac{(655 \space mmHg)(10.0 \space L)}{1.25 \space L} = 5240 \space mmHg$$
