From the Periodic table, it can be determined that iron (Fe) has an atomic mass of 56 amu, oxygen (O) has an atomic mass of 16 amu, and hydrogen (H) has a mass of 1 amu. What would the atomic mass of Fe(OH)3

Question

be?(1 point)
Responses

73 amu
73 amu

219 amu
219 amu

75 amu
75 amu

107 amu

Answer 1

To calculate the atomic mass of Fe(OH)₃, we need to consider the contributions from iron (Fe) and the hydroxide (OH) groups.

1. The atomic mass of iron (Fe) is 56 amu.
2. Each hydroxide (OH) group consists of one oxygen (O) and one hydrogen (H).
   • The mass of one oxygen atom is 16 amu.
   • The mass of one hydrogen atom is 1 amu.
   • Therefore, the atomic mass of one hydroxide (OH) group = 16 amu + 1 amu = 17 amu.
3. There are 3 hydroxide groups in Fe(OH)₃, so the total mass for the hydroxide groups is:
   • 3 × 17 amu = 51 amu.

Now, we sum the mass of iron and the mass of the hydroxide groups:

• Total atomic mass of Fe(OH)₃ = mass of Fe + mass of 3(OH)
• Total atomic mass of Fe(OH)₃ = 56 amu + 51 amu = 107 amu.

Therefore, the atomic mass of Fe(OH)₃ is 107 amu.