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##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 ##xx##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:
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”)##
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