Question

Name: ID: 19) Avessel contained N, Ar, He and Ne. The total pressure in the vessel was 987 torr. The partlal pressures of nitrogen, argon and hellium were 44, 486 and 218 torr respectively. The partial pressure of neon in the vessel was torr. A) 239 B 42.4 C) 760 D) 521 -E) 19.4 20) The lid is tightly sealed on an empty 2.0 L soda bottle at 25"C and 732 mm Hg. If the bottle is heated to 100'C, what is the pressure in the bottle? (Hint: constant V) A) 585 mm Hg B) 2.5 mm Hg C) 916 mm Hg D) 2.93 x 10 mm Hg E) 183 mm Hg 21) For ushick af the Fallounng a) 2 NoCs) Bea () b) 2Nao Ca) 2029) L2NO BK CA) 2 SUs ls) +Cpls) d) 2s0r(5) 7

Answer 1

Q20. Correct answer is : (C) 916 mm Hg

Explanation

Q20. According to Gay-Lussac's law, pressure of a gas is directly proportional to its absolute temperature, provided volume and amount of gas remains constant.

Mathematically, P₂ / P₁ = T₂ / T₁

where P₁ = initial pressure = 732 mmHg

T₁ = initial pressure = 25 ^oC = 298 K

P₂ = final pressure

T₂ = final temperature = 100 ^oC = 373 K

Substituting the values,

P₂ / (732 mmHg) = (373 K) / (298 K)

P₂ / (732 mmHg) = 1.25

P₂ = (732 mmHg) * (1.25)

P₂ = 916 mmHg