calculate the formula masses H3PO4

Question

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Answer 1

You have to use the periodic table and look at the atomic mass for each element. The atomic mass is the number at the bottom of each element block.

 

So for H the atomic mass is 1.008 and there are 3 so (1.008 x 3).... 

PLUS

Phosphorus atomic mass... 

PLUS

Oxygen atomic mass times 4...