How do you determine the molar mass of $B F_{3}$ $BF_3$ ?

Question

12376 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2016-07-17T01:13:41

$67.81 g/mol$ $color(hotpink)("67.81 g/mol")$

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

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

First, you want to have a periodic table available so you can determine the atomic weight of B and F:

From the chemical formula, we have 1 boron atom, so the atomic mass would just be 10.811 g/mol

Next, you have 3 fluorine atoms, so you would multiply the atomic mass of F by 3 to obtain an atomic weight of 57.00 g/mol

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

$10.811 g/mol + 57.00 g/mol = 67.81 g/mol$ $color(red) ("10.811 g/mol + 57.00 g/mol = 67.81 g/mol")$

How do you determine the molar mass of BF3BF_3?