Question

The atomic mass of nickel (Ni) is 58.693 amu, and the atomic mass of chlorine (Cl) is 35.45 amu. Which molar mass is correct for nickel chloride (NiCl2)?(1 point)
Responses

188.29 g/mol
188.29 g/mol

94.14 g/mol
94.14 g/mol

152.84 g/mol
152.84 g/mol

129.59 g/mol

Answer 1

To find the molar mass of nickel chloride (NiCl₂), we need to add the atomic mass of nickel (Ni) and twice the atomic mass of chlorine (Cl) because there are two chlorine atoms in the compound.

1. The atomic mass of Ni = 58.693 amu
2. The atomic mass of Cl = 35.45 amu

Calculating the molar mass of NiCl₂:

\[
\text{Molar mass of NiCl₂} = \text{mass of Ni} + 2 \times \text{mass of Cl}
\]
\[
= 58.693 \, \text{g/mol} + 2 \times 35.45 \, \text{g/mol}
\]
\[
= 58.693 \, \text{g/mol} + 70.90 \, \text{g/mol}
\]
\[
= 129.593 \, \text{g/mol}
\]

Rounding to two decimal places, the molar mass of NiCl₂ is approximately **129.59 g/mol**.

Therefore, the correct response is **129.59 g/mol**.