Question

Mr(Fe(OH)2) Mr(Mg(NO3)2) Mr(Al2(SO4)3)

Answer 1

Первое 92 Второе 210 Третье 342

Answer 2

Mr(Fe(OH)2)

The molar mass of Fe(OH)2, which is iron(II) hydroxide, can be calculated by adding up the atomic masses of its constituent elements. Iron (Fe) has an atomic mass of 55.845 g/mol, and each hydroxide (OH) group consists of one oxygen (O) atom with an atomic mass of 15.999 g/mol and one hydrogen (H) atom with an atomic mass of 1.00784 g/mol. Therefore, the molar mass of Fe(OH)2 is calculated as follows:

Fe: 1 atom x 55.845 g/mol = 55.845 g/mol O: 2 atoms x 15.999 g/mol = 31.998 g/mol H: 2 atoms x 1.00784 g/mol = 2.01568 g/mol

Adding these values together, we get: 55.845 g/mol + 31.998 g/mol + 2.01568 g/mol = 89.85868 g/mol.

Mr(Mg(NO3)2)

The molar mass of Mg(NO3)2, which is magnesium nitrate, can be calculated in a similar manner. Magnesium (Mg) has an atomic mass of 24.305 g/mol, nitrogen (N) has an atomic mass of 14.00674 g/mol, and each nitrate (NO3) group consists of one nitrogen atom and three oxygen atoms. Oxygen has an atomic mass of 15.999 g/mol. Therefore, the molar mass of Mg(NO3)2 is calculated as follows:

Mg: 1 atom x 24.305 g/mol = 24.305 g/mol N: 2 atoms x 14.00674 g/mol = 28.01348 g/mol O: 6 atoms x 15.999 g/mol = 95.994 g/mol

Adding these values together, we get: 24.305 g/mol + 28.01348 g/mol + 95.994 g/mol = 148.31248 g/mol.

Mr(Al2(SO4)3)

The molar mass of Al2(SO4)3, which is aluminum sulfate, can also be calculated using the atomic masses of its constituent elements. Aluminum (Al) has an atomic mass of 26.9815386 g/mol, sulfur (S) has an atomic mass of 32.06 g/mol, and each sulfate (SO4) group consists of one sulfur atom and four oxygen atoms. Oxygen has an atomic mass of 15.999 g/mol. Therefore, the molar mass of Al2(SO4)3 is calculated as follows:

Al: 2 atoms x 26.9815386 g/mol = 53.9630772 g/mol S: 3 atoms x 32.06 g/mol = 96.18 g/mol O: 12 atoms x 15.999 g/mol = 191.988 g/mol

Adding these values together, we get: 53.9630772 g/mol + 96.18 g/mol + 191.988 g/mol = 342.1310772 g/mol.

To summarize: - The molar mass of Fe(OH)2 (iron(II) hydroxide) is approximately 89.85868 g/mol. - The molar mass of Mg(NO3)2 (magnesium nitrate) is approximately 148.31248 g/mol. - The molar mass of Al2(SO4)3 (aluminum sulfate) is approximately 342.1310772 g/mol.