Question

Посчитать молярную массу 1) M (h2So4) = 2) M (P2 O5) = 3) M (Fe( OH)2)=

Answer 1

Ответ:

1)98

2)142

3)90

должно быть так

Answer 2

1. M (H2SO4): The molar mass of hydrogen (H) is approximately 1.00784 g/mol. The molar mass of sulfur (S) is approximately 32.06 g/mol. The molar mass of oxygen (O) is approximately 16.00 g/mol.

To calculate the molar mass of H2SO4, we sum up the molar masses of all its constituent elements:

M (H2SO4) = 2 * M (H) + M (S) + 4 * M (O) = 2 * 1.00784 g/mol + 32.06 g/mol + 4 * 16.00 g/mol = 2.01568 g/mol + 32.06 g/mol + 64.00 g/mol = 98.07668 g/mol

Therefore, the molar mass of H2SO4 is approximately 98.08 g/mol.

2. M (P2O5): The molar mass of phosphorus (P) is approximately 30.97 g/mol. The molar mass of oxygen (O) is approximately 16.00 g/mol.

To calculate the molar mass of P2O5, we sum up the molar masses of all its constituent elements:

M (P2O5) = 2 * M (P) + 5 * M (O) = 2 * 30.97 g/mol + 5 * 16.00 g/mol = 61.94 g/mol + 80.00 g/mol = 141.94 g/mol

Therefore, the molar mass of P2O5 is approximately 141.94 g/mol.

3. M (Fe(OH)2): The molar mass of iron (Fe) is approximately 55.85 g/mol. The molar mass of hydrogen (H) is approximately 1.00784 g/mol. The molar mass of oxygen (O) is approximately 16.00 g/mol.

To calculate the molar mass of Fe(OH)2, we sum up the molar masses of all its constituent elements:

M (Fe(OH)2) = M (Fe) + 2 * M (O) + 2 * M (H) = 55.85 g/mol + 2 * 16.00 g/mol + 2 * 1.00784 g/mol = 55.85 g/mol + 32.00 g/mol + 2.01568 g/mol = 89.86568 g/mol

Therefore, the molar mass of Fe(OH)2 is approximately 89.87 g/mol.