Question

87. Обчисліть масові частки йонів у сполуках MgN, i Mg(OH)2- даю 40 балов

Answer 1

Ответ:

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Answer 2

Calculation of Ion Mass Fractions in MgN and Mg(OH)2

To calculate the mass fractions of ions in the compounds MgN and Mg(OH)2, we need to know the molar masses of the elements involved and the chemical formulas of the compounds.

The molar mass of magnesium (Mg) is approximately 24.31 g/mol, nitrogen (N) is approximately 14.01 g/mol, hydrogen (H) is approximately 1.01 g/mol, and oxygen (O) is approximately 16.00 g/mol.

1. MgN: - The chemical formula of MgN suggests that it contains one magnesium ion (Mg2+) and one nitrogen ion (N3-). - To calculate the mass fractions, we need to determine the total molar mass of the compound. - The molar mass of MgN can be calculated as follows: - Mg: 1 atom * 24.31 g/mol = 24.31 g/mol - N: 1 atom * 14.01 g/mol = 14.01 g/mol - Total molar mass = 24.31 g/mol + 14.01 g/mol = 38.32 g/mol - The mass fraction of the magnesium ion (Mg2+) can be calculated as follows: - Mg: 24.31 g/mol / 38.32 g/mol = 0.634 - The mass fraction of the nitrogen ion (N3-) can be calculated as follows: - N: 14.01 g/mol / 38.32 g/mol = 0.366

2. Mg(OH)2: - The chemical formula of Mg(OH)2 suggests that it contains one magnesium ion (Mg2+) and two hydroxide ions (OH-). - To calculate the mass fractions, we need to determine the total molar mass of the compound. - The molar mass of Mg(OH)2 can be calculated as follows: - Mg: 1 atom * 24.31 g/mol = 24.31 g/mol - O: 2 atoms * 16.00 g/mol = 32.00 g/mol - H: 2 atoms * 1.01 g/mol = 2.02 g/mol - Total molar mass = 24.31 g/mol + 32.00 g/mol + 2.02 g/mol = 58.33 g/mol - The mass fraction of the magnesium ion (Mg2+) can be calculated as follows: - Mg: 24.31 g/mol / 58.33 g/mol = 0.417 - The mass fraction of the hydroxide ion (OH-) can be calculated as follows: - O: 32.00 g/mol / 58.33 g/mol = 0.549 - H: 2.02 g/mol / 58.33 g/mol = 0.034

Therefore, the mass fractions of ions in MgN are approximately: - Mg2+: 0.634 - N3-: 0.366

And the mass fractions of ions in Mg(OH)2 are approximately: - Mg2+: 0.417 - OH-: 0.549 - H+: 0.034

Please note that these calculations are based on the given chemical formulas and the molar masses of the elements involved.