Question

Asample of methane (CH4) has a volume of 21 mL at a pressure of 1.5 atm. What is the final volume, in milliliters, of the gas at each of the following pressures, if there is no change in temperature and amount of gas? Part A 0.20 atm Express your answer to two significant figures and include the appropriate units Value Units V= Request Anewer Submit Part B 2.67 atm Express your answer to two significant figures and include the appropriate units A Value Units V= Submit Request Anewer Part C 2900 mmHg Express your answer to two significant figures and include the appropriate units. Value Units V= Request Anewer Submit Part D 890 Torr Express your answer to two significant figures and include the appropriate units. BA Value Units V= Request Anewer Submit Provide Feedback

Answer 1

A)

Given:

Vi = 21 mL

Pi = 1.5 atm

Pf = 0.20 atm

use:

Pi*Vi = Pf*Vf

1.5 atm * 21 mL = 0.2 atm * Vf

Vf = 158 mL

Answer: 160 mL

B)

Given:

Vi = 21 mL

Pi = 1.5 atm

Pf = 2.67 atm

use:

Pi*Vi = Pf*Vf

1.5 atm * 21 mL = 2.67 atm * Vf

Vf = 12 mL

Answer: 12 mL

C)

Given:

Vi = 21 mL

Pi = 1.5 atm

Pf = 2900.0 mm Hg

= (2900.0/760) atm

= 3.8158 atm

use:

Pi*Vi = Pf*Vf

1.5 atm * 21 mL = 3.8158 atm * Vf

Vf = 8.3 mL

Answer: 8.3 mL

D)

Given:

Vi = 21 mL

Pi = 1.5 atm

Pf = 89.0 torr

= (89.0/760) atm

= 0.1171 atm

use:

Pi*Vi = Pf*Vf

1.5 atm * 21 mL = 0.1171 atm * Vf

Vf = 269 mL

Answer: 270 mL