Question

The atomic mass of Iron (Fe) is 55.85 amu, and the atomic mass of chlorine (Cl) is 35.45 amu. Which molar mass is correct for iron III chloride (FeCl3
)?(1 point)
Responses

162.20 g/mol
162.20 g/mol

91.30 g/mol
91.30 g/mol

129.59 g/mol
129.59 g/mol

126.75 g/mol
126.75 g/mol

Answer 1

To calculate the molar mass of iron(III) chloride (FeCl₃), you need to add the molar mass of iron (Fe) and three times the molar mass of chlorine (Cl).

Given:
- Atomic mass of Fe = 55.85 amu
- Atomic mass of Cl = 35.45 amu

The calculation for FeCl₃ is as follows:

\[
\text{Molar mass of FeCl}_3 = \text{molar mass of Fe} + 3 \times \text{molar mass of Cl}
\]
\[
= 55.85 \, \text{g/mol} + 3 \times 35.45 \, \text{g/mol}
\]
\[
= 55.85 \, \text{g/mol} + 106.35 \, \text{g/mol}
\]
\[
= 162.20 \, \text{g/mol}
\]

So, the correct molar mass for iron(III) chloride (FeCl₃) is **162.20 g/mol**.