Question

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 be? (1 point)

73 amu

75 amu

219 amu

107 amu

Explanation:

Step1: Calculate oxygen mass in Fe(OH)₃

There are 3 oxygen atoms. Each oxygen has mass 16 amu, so total oxygen mass is $3\times16 = 48$ amu.

Step2: Calculate hydrogen mass in Fe(OH)₃

There are 3 hydrogen atoms. Each hydrogen has mass 1 amu, so total hydrogen mass is $3\times1=3$ amu.

Step3: Add masses of Fe, O and H

Iron has mass 56 amu. Total mass of Fe(OH)₃ is $56 + 48+3=107$ amu.

Answer:

107 amu