Question

A 20 g chunk of dry ice is place in an empty 0.75 litre wine bottle tightly closed. What would be the final pressure inside the bottle after all co2 has been evaporated and temperature reaches to 25°c?



  a.   14.83 atm



  b.   15.83 atm



  c.   16.83 atm



  d.   17.83 atm

Answer 1

Given

w = 20g dry CO2 which will evaporate to develop P

m = 44

V = 0.75 litre

P = ?

T = 298 K

PV = wmRT

P×0.75=2044×0.0821×298

⇒ P = 14.828 atm

Pressure inside bottle = P + atm. pressure

⇒ 14.828 + 1 = 15.828 atm

Hence answer is B

Answer 2

Given

w = 20g dry CO2 which will evaporate to develop P

m = 44

V = 0.75 litre

P = ?

T = 298 K

PV = w/m×RT

P×0.75=20/44×0.0821×298

⇒⇒ P = 14.828 atm

Pressure inside bottle = P + atm. pressure

⇒⇒ 14.828 + 1 = 15.828 atm

Hence answer is (C)