Question

O cantitate de azot de masa 2g se afla initial la presiune normala si temperatura t1 27 C°.Prin incalzire izocora presiunea creste de k 3 ori .Aflati a)temperatura finala T2 b)volumul V ocupat de gaz c)caldura Q absorbita

Answer 1

m=2 g=2*10⁻³ kg

T₁=27°C=300 K

p₁=10⁵ Pa

μ=28 g/mol=29*10⁻³ kg/mol

p₁=kp₂

V₁=V₂=const.

p₁/T₁=p₂/T₂=>T₂=T₁p₂/p₁=T₁kp₁/p₁=kT₁=3*300=900 K

υ=m/μ=2*10⁻³/29*10⁻³=0,068 moli

p₁V=υRT₁=>V=υRT₁/p₁=0,068*8,31*300/10⁵=170/10⁵=17*10⁻⁴ m³=1,7 l

Q=υCvΔT

γ=1,48

Cv=R/(γ-1)=8,31/(1,48-1)=8,31/0,48=17,31 J

Q=υCvΔT=0,068*17,31(900-300)=1,17*600=706,35 J