What is the percent composition of #Na_3PO_4#?

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Answer 1 · 2016-02-19T17:13:35

#42.1% Na, 18.9%P, 39%O#

The molar mass of sodium phosphate is #M_r=(3xx23)+31+(4xx16)=164g//mol#.

Now consider 1 mole of #Na_3PO_4# which has a mass of #164g#:

#3xx23=69g# is sodium, #31g# is phosphorous, #4xx16=64g# is oxygen.

Therefore the percentage composition of each element is:

#69/164xx100=42.1% Na#

#31/164xx100=18.9% P#

#64/164xx100=39% O#