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2.M0LE CONCEPTS

2.M0LE CONCEPTS. KONSEP MOL. Teaching Learning Objectivers. The student can explain Ar of element The student can calculate Mr of a molecule The student can calculate the amount of mole to the amount of particules . The student can calculate the amount of mole to

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2.M0LE CONCEPTS

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  1. 2.M0LE CONCEPTS KONSEP MOL

  2. Teaching Learning Objectivers • The student can explain Ar of element • The student can calculate Mr of a molecule • The student can calculate the amount of mole to the amount of particules. • The student can calculate the amount of mole to the amount of mass. • The student can calculate the amount of mole to the amount of volume gas

  3. The Relatif Atomic Mass (Ar) One atomic mass X Ar of element X = 1 x one atomic mass of C-12 12 Example: Mass Na Ar of Na = 1/12 x C-12 22,99 sma = 1/12 x 12 sma = 22,99

  4. The Relatif Molecule Mass (Mr) One molecule mass XY Mr of molecule XY = 1 x one atomic mass of C-12 12 One molecule mass H2O Example: Mr of H2O = 1 x one atomic mass of C-12 12 Mass 2 atom H + Mass 1 atom O = 1 x one atomic mass of C-12 12 Mass 2 atom H Mass 1 atom O + = 1 x one atomic mass of C-12 12 1 x one atomic mass of C-12 12 + = 2 x Ar H 1 x Ar O = 2 x 1 + 1 x 16 = 18

  5. Mr of a molecule is the total number from each Ar of its elements • Example: • Mr H2SO4 = 2 Ar H + 1 Ar S + 4 Ar O = 2 . 1 + 1 . 32 + 4 . 16 = 2 + 32 + 64 = 98 Mr Al2(SO4)3= 2 Ar Al + 3 Ar S + 12 Ar O = 2 . 27 + 3 . 32 + 12 . 16 = 54 + 96 + 192 = 342

  6. Mr CuSO4 . 2H2O = 1 Ar Cu + 1 Ar S + 4 Ar O + 4 Ar H + 2 Ar O = 1. 63,5 + 1.32 + 4.16 + 4 .1 + 2.16 = 63,5 + 32 + 64 + 4 +32 = 195.5

  7. Kerjakan soal-soal di bawah ini • Hitung Mr dari : • 1. Pb(NO3)2 • 2. Ca3(PO4)2 • 3. MgSO4. 7H2O

  8. : : The Number of PARTICULES Mass of Substance 6,02x1023 MOLE Ar / Mr X X 22,4 Liter : X Gas Volume STP

  9. Example 1: 0, 5 mole NH3 Calculate : - the mass of substance - gas volume in a standart (0oC, 1atm) - the number of paticules -The mass of substance 0,5 mole NH3 = 0,5 x Mr NH3 gr = 0,5 x 17 gram Mr NH3= 1. Ar N + 3 .Ar H = 8,5 gram = 1.14 + 3. 1 = 17 -Volume0,5 mole NH3 (0oC,1 atm) = 0,5 x 22,4 liter = 11,2 liter

  10. -The number of particules 0,5 mole NH3 = 0,5 x 6,02 x 1023 molekul NH3 = 3,01 x 1023 molekul NH3 = 3,01 x 1023 atom N + 9.03 x 1023 atom H *The number of particules 0,2 mole Na = 0,2 x 6,02 x 1023atom Na = 1.204 x 1023atom Na = 12,04 x 1022 atom Na Partikel dari senyawa adalah molekul Partikel dari senyawa ion adalah ion Partikel dari unsur adalah atom

  11. *The number particules 0,2 mole CaCl2 = 0,2 x 6,02 x 1023molekul CaCl2 = 1,204 x 1023molekul CaCl2 = 1,204 x 1023ion Ca+2 + 2,408 x 1023 ion Cl- Example 2: 3,01 x 1023molekul Cl2 Calculate : - the mass of substance - gas volume in a standart (0oC, 1atm) 3,01 x 1023molekul Cl2 1 3,01 x 1023 mole Cl2 = mole Cl2 = 2 6,02 x 1023 = 0,5 mole Cl2

  12. -The mass of substance 0,5 mole Cl2 = 0,5 x Mr Cl2 gr = 0,5 x 71 gr Mr Cl2= 2 . Ar Cl = 2 . 35,5 = 35,5 gr = 71 -Volume 0,5 mole Cl2 (0oC,1 atm) = 0,5 x 22,4 liter = 11,2 liter

  13. Hubungan antara mol dengan volume gas(volume molar) • Volume gas pada keadaan standar (STP) Volume 1 mol gas pada keadaan STP yaitu pada suhu 0oC dan tekanan 1 atm volumenya selalu 22,4 liter. Volume 1 mol gas O2 (STP/0oC, 1 atm) = 22.4 liter • Volume gas pada keadaan tidak standar 1). Volume gas pada suhu dan tekanan tertentu. Menggunakan hukum Boyle-Gay Lussac: P V=n R T dimana P = tekanan dalam atm V = volume dalam liter n = mol R = tetapan gas (L.atm/mol.oK) = 0,082 L.atm/mol.oK T = suhu mutlak dalam oK (to+273o)

  14. 2). Volume gas diukur pada keadaan gas yang sama dengan gas lain. Volume gas dapat dihitung dengan menggunakan rumus : n1 = n2 v1 v2

  15. Kerjakan soal-soal dibawah ini: • Diketahui gas metana (CH4) sebanyak 0,25 mol hitunglah: a. jumlah molekul CH4 b. Jumlah atom H dalam CH4 • Berapa volume dari 3,4 gr gas amoniak NH3 diukur pada suhu 0oC dan tekanan 1 atm ? • Kristal Zn(NO3)2 . xH2O sebanyak 10 grm dipanaskan hingga semua airnya menguap, ternyata beratnya tingal 6,346 gram, Tentukan harga x dari rumus kristal! 4. Hitung volume dari 22 gram gas CO2 bila diukur pada: a. Suhu 0oC tekanan 1 atm. b. Suhu 27oC tekanan 78 cm Hg. 5. Berapa volume dari 3,4 grm gas NH3, bila diukur : a. Suhu 0oC tekanan 1 atm. b. Suhu 27oC tekanan 78 cm Hg. c. Pada saat 15 grm gas NO volumenya 10 liter.

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