Question

1)Mr(Fe(OH)3)=2)Mr(Al2(So4)3)=3)Mr(Cu(No3)2)=З розвязком​

Answer 1

Ответ:

1) 56+16×3+1×3=107г/моль

2) 27×2+32×3+16×12=342г/моль

3) 45+14×2+16×6=169г/моль

Answer 2

1) Mr(Fe(OH)3): To calculate the molar mass of Fe(OH)3, we need to add up the atomic masses of each element in the compound.

Fe: Iron has an atomic mass of approximately 55.845 g/mol. O: Oxygen has an atomic mass of approximately 15.999 g/mol. H: Hydrogen has an atomic mass of approximately 1.00784 g/mol.

Now let's calculate the molar mass of Fe(OH)3:

Fe: 1 atom x 55.845 g/mol = 55.845 g/mol O: 3 atoms x 15.999 g/mol = 47.997 g/mol H: 3 atoms x 1.00784 g/mol = 3.02352 g/mol

Adding up the masses of each element: 55.845 g/mol + 47.997 g/mol + 3.02352 g/mol = 106.86552 g/mol

Therefore, the molar mass of Fe(OH)3 is approximately 106.87 g/mol.

2) Mr(Al2(So4)3): To calculate the molar mass of Al2(So4)3, we need to add up the atomic masses of each element in the compound.

Al: Aluminum has an atomic mass of approximately 26.981538 g/mol. S: Sulfur has an atomic mass of approximately 32.06 g/mol. O: Oxygen has an atomic mass of approximately 15.999 g/mol.

Now let's calculate the molar mass of Al2(So4)3:

Al: 2 atoms x 26.981538 g/mol = 53.963076 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 up the masses of each element: 53.963076 g/mol + 96.18 g/mol + 191.988 g/mol = 342.131076 g/mol

Therefore, the molar mass of Al2(So4)3 is approximately 342.13 g/mol.

3) Mr(Cu(No3)2): To calculate the molar mass of Cu(No3)2, we need to add up the atomic masses of each element in the compound.

Cu: Copper has an atomic mass of approximately 63.546 g/mol. N: Nitrogen has an atomic mass of approximately 14.00674 g/mol. O: Oxygen has an atomic mass of approximately 15.999 g/mol.

Now let's calculate the molar mass of Cu(No3)2:

Cu: 1 atom x 63.546 g/mol = 63.546 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 up the masses of each element: 63.546 g/mol + 28.01348 g/mol + 95.994 g/mol = 187.55348 g/mol

Therefore, the molar mass of Cu(No3)2 is approximately 187.55 g/mol.

I hope this answers your question! Let me know if there's anything else I can help with.