# What is the molar mass of lead (II) chloride (PbCl_2)?

Aug 11, 2016

$P b C {l}_{2}$ has a molar mass of 278.1 g/mol

#### Explanation:

$\textcolor{g r e y}{\text{We will use the formula below to answer the question:}}$

atomic weight of element $\times$number of atoms given by subscript $=$ molar mass

You should have a periodic table available so you can determine the atomic weight of Pb and Cl:

• Pb has an atomic weight of 207.2 g/mol
• Cl has an atomic weight of 35.45 g/mol

From the chemical formula, we have one Pb atom, so the atomic mass would just be 207.2 g/mol

Next, you have two Cl atoms, so you would multiply the atomic mass of Cl by 2 to obtain an atomic weight of 70.90 g/mol

Now you want to add the mass of each atom together to obtain the molar mass of the entire compound:

$\textcolor{v i o \le t}{\text{207.2 g/mol + 70.90 g/mol = 278.1 g/mol}}$