Slide 1

Bi tpChng II1Bi II.1Tnh nhiet dung rieng c cua tinh the nhom va ong theo ly thuyet nhiet dung co ien. Nhit dung tnh theo l thuyt c in:C: nhit dung3N: s dao ng t /kgk: hng s Boltzman (1,38.10-23J/K)C = 3Nk

nhiet dung rieng c cua tinh the nhom theo ly thuyet nhiet dung co ienTinh th Al: mAl: 26,98 g = 26,98.10-3 kg

S nguyn t Al/kg:

S dao ng t: S dao ng t = 3N

nhiet dung rieng c cua tinh the nhom theo ly thuyet nhiet dung co ien:C = 3Nk

924 J/kg.Knhiet dung rieng c cua tinh the Cu theo ly thuyet nhiet dung co ienTinh th Cu: mCu: 26,98.10-3 kgS nguyn t Cu/kg:

S dao ng t: S dao ng t = 3N

nhiet dung rieng c cua tinh the Cu theo ly thuyet nhiet dung co ien:C = 3Nk

392 J/kg.KBi II.2Xac nh nhiet dung cua mot n v the tch cua tinh the AlBr3 theo ly thuyet nhiet dung co ien. Khoi lng rieng cua tinh the Bromua nhom = 3,01.103 kg/m3 nhiet dung rieng c cua tinh the AlBr3 theo ly thuyet nhiet dung co ienTinh th AlBr3: mAlBr3:S phn t AlBr3/kg:

S dao ng t ca 1 phn t AlBr3: S dao ng t = 3N nhiet dung rieng c cua tinh the AlBr3 theo ly thuyet nhiet dung co ien:C = 3Nk

374 J/kg.K(26,98 + 3.79,9).10-3kg1phn t gm 4 nguyn t = 266,68.10-3kg

nhiet dung rieng c cua mt n v th ti`ch ca tinh the AlBr3 theo ly thuyet nhiet dung co ien:CV =.C 3,01.103.374 1 125 740 1,12M J/m3.KJ/m3.KBi II.3Xac nh nhiet dung rieng va o thay oi noi nang cua tinh the Ni khi lam nong no t T1 = 0oC en T2 = 2000C. Khoi lng cua tinh the m = 20 g.

U = mcT : Bin Thin Ni Nngnhiet dung rieng c cua tinh the Ni theo ly thuyet nhiet dung co ienTinh th Ni: mNi: 58,71.10-3 kgS nguyn t Ni/kg:

S dao ng t: S dao ng t = 3N

C = 3Nk

424 J/kg.Ko thay oi noi nang cua tinh the Ni khi lam nong no t T1 = 0oC en T2 = 200oCU = mcT = 0,02.424.(200-0) 1700 J/kg.KBi II.4Tm tan so dao ong cua cac nguyen t Bac theo ly thuyet nhiet dung cua Einstein neu nhiet o ac trng cua Bac E = h/k = 165 K. E = h/k : Nhit c TrngTheo L thuyt Einstein:

: tn s EinsteinE: nhit Einsteinh: hng s Plank (6,63.10-34Js)k: hng s Boltzman (1,38.10-23J/K)tan so dao ong cua cac nguyen t Bac theo ly thuyet nhiet dung cua Einstein

nhiet o ac trng cua Bac E = h/k = 165 K

3,44.1012 HzBi II.7e lam nong 10g Bac t 10K len 20K can nhiet lng Q = 0,71 J. Xac nh nhiet o ac trng Debye D cua Bac. Xem T