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QUESTION

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

PbCl_2 has a molar mass of 278.1 g/mol

color(grey)"We will use the formula below to answer the question:"

atomic weight of element xxnumber 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 would just be 207.2 g/mol

Next, you have two Cl atoms, so you would multiply the 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:

color(violet) ("207.2 g/mol + 70.90 g/mol = 278.1 g/mol")