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3 em qc - aula 8 - mol estudo da quantidade de mol

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1. EXERCÍCIOS Pg. 102 Exercícios 1, 2 e 3 2. d = 1 g/mL --------------- > 1 mL ----------------- 1 g 180 mL ----------------- 180 g m = 180 g de água Massa Molar…
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  • 1. EXERCÍCIOS Pg. 102 Exercícios 1, 2 e 3
  • 2. d = 1 g/mL --------------- > 1 mL ----------------- 1 g 180 mL ----------------- 180 g m = 180 g de água Massa Molar (M) da H2O = 2. 1 + 1. 16 = 18 g/ mol 1 mol ---------------- 18 g n = 180 = 10 mols n ---------------- 180 g 18 Ou: n = m = 180 g = 10 mols M 18 g/mol
  • 3. Massa Molecular (MM) do H2 = 2 . 1 = 2 u Massa Molar (M) = 2 g 2 g ---------------- 6,0 . 1023 moléculas 8 g ---------------- X X = 8 . 6,0 . 1023 = 24 . 1023 2 X = 2,4 . 1024 moléculas
  • 4. Massa Molar (M) do C4H10 = 4.12 + 10.1 = 58 g/ mol 58 g ----- 6,0 . 1023 moléculas ----- 14 (6,0 . 1023) átomos 23,2 g ------------------------------------ X X = 23,2 . 14 (6,0 . 1023) = 33,6 . 1023 58 X = 3,36 . 1024 átomos
  • 5. EXERCÍCIOS Pg. 102 Exercícios 4 e 5
  • 6. Massa Molar (M) do CO = 1 . 12 + 1 . 16 = 28 g/ mol 28 g ----------------- 6,0 . 1023 moléculas X g ----------------- 1,8 . 1022 moléculas X = 28 . 1,8 . 1022 = 8,4 . 10-1 g 6,0 . 1023 X = 0,84 gramas
  • 7. Massa Molar (M) do CH4 = 1 . 12 + 4 . 1 = 16 g/ mol 1 kg = 1000 g, então 3,2 kg = 3200 g 1 mol ----------------- 16 g n ------------------ 3200 g n = 3200 = 16 X = 200 mols
  • 8. 200 mol ----------------- 5 horas n ------------------- 1 hora n = 200 = 40 mols 5 1 mol ------------------- 6,0 . 1023 moléculas 40 mols ---------------- X moléculas X = 40 (6,0 . 1023) = 240 . 1023 moléculas = 2,4 . 1025 moléculas
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