Hi! pls help me to answer this science homework

Question

1. A container holds 500 mL of CO 2 at 20°C and

742 torr. What will be the volume of CO 2 if the

pressure is increased to 805 torr and the

temperature is kept as is?

2. A balloon contains 7.2 L of He. The pressure is

reduced to 1.75.00 atm and the balloon expands

to occupy a volume of 25.1 L. What was the initial

pressure exerted on the balloon?

Answer 1

(1).

P1 = 742 torr

V1 = 500 ml

T1 = 20º + 273 = 293K

P2 = 805 torr

V2 = ?

T2 = 293K

Constant temperature = Boyle's Law: P1V1 = P2V2

(742 torr)(500 ml) = (805 torr)(V2)

V2 = 471 mls

(2).

V1 = 7.2 L

P1 = ?

V2 = 25.1 L

P2 = 1.75 atm

Assume constant temperature since none is provided. This again is Boyles Law: P1V1 = P2V2

(P1)(7.2 L) = (1.75 atm)(25.1 L)

P1 = 6.10 atm