How can you find formula mass?

1 Answer
anor277
Jul 8, 2017

Got a #"Periodic Table.......?"#

Explanation:

So let us take a simple inorganic salt, #Na^(+)PF_6^(-)#. Get your Table which lists all known elements, and look up the table to find the molar masses of each element (and you will soon commit the common ones to memory)..... Phosphorus has a molar mass of #31.00*g*mol^-1#; sodium has a molar mass of #22.99*g*mol^-1#; and fluorine has a molar mass of #19.00*g*mol^-1#.

And we simply add the masses of the atoms together to according to the given formula, that is ......................#{22.99+31.00+6xx19.00}*g*mol^-1=167.95*g*mol^-1#.

So can you repeat the calculation for #CaCO_3#, #C_6F_6#, #C_5H_12#..........? Have a go.......

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