1) Find the percent composition of copper (II) phosphate: Cu3(PO4)2

2) Find the percent composition of sodium sulfate: Na2SO4

3) Find the simplest (empirical) formula of a compound found to consist of 26.56% K, 35.41% Cr, and
38.03% O.

4) Find the molecular formula of a compound having a simplest formula of CH2O and a formula mass of 180.16u.

5) Determine the molecular formula of a compound consisting of 40.00% C, 6.71% H, and 53.29%O, with a formula mass of 180.1854 u.
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