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17.12.2020 •
Chemistry
Design an experiment to show that the heat flow
between adjacent objects of different temperatures is greater when the
temperature difference is greater.
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Ответ:
(a) 0.98 mol
(b) 0.241 mol
(c) 6.18 × 10⁻⁴ mol
Explanation:
(a)
Let´s consider the ionization of NH₄Cl.
NH₄Cl(s) → NH₄⁺(aq) + Cl⁻(aq)
1 mole of NH₄Cl produces 2 moles of ions. The moles of ions produced by 0.49 moles of NH₄Cl are:
0.49 mol NH₄Cl × (2 mol ions/1 mol NH₄Cl) = 0.98 mol ions
(b)
Let's consider the ionization of Ba(OH)₂· 8 H₂O.
Ba(OH)₂· 8 H₂O(s) → Ba²⁺(aq) + 2 OH⁻(aq) + 8 H₂O(l)
The molar mass of Ba(OH)₂· 8 H₂O is 315.48 g/mol. The moles of Ba(OH)₂· 8 H₂O corresponding to 25.3 g are:
25.3 g × (1 mol/315.48 g) = 0.0802 mol
1 mole of Ba(OH)₂· 8 H₂O produces 3 moles of ions. The moles of ions produced by 0.0802 moles of Ba(OH)₂· 8 H₂O are:
0.0802 mol Ba(OH)₂· 8 H₂O × (3 mol ions/ 1 mol Ba(OH)₂· 8 H₂O) = 0.241 mol ions
(c)
Let's consider the ionization of LiCl.
LiCl(s) → Li⁺(aq) + Cl⁻(aq)
1 mole of LiCl contains 6.02 × 10²³ formula units of LiCl. The moles of LiCl that contain 1.86 × 10²⁰ formula units are:
1.86 × 10²⁰ fu × (1 mol LiCl/6.02 × 10²³ fu) = 3.09 × 10⁻⁴ mol LiCl
1 mole of LiCl produces 2 moles of ions. The moles of ions produced by 3.09 × 10⁻⁴ moles of LiCl are:
3.09 × 10⁻⁴ mol LiCl × (2 mol ions/1 mol LiCl) = 6.18 × 10⁻⁴ mol ions