The number of oxygen atoms present in 2 moles of a compound, which consists of a bivalent metal and a perchlorate ion is:
The percentage composition of sodium phosphate as determined by analysis is 42.1% sodium, 18.9% phosphorus and 39% oxygen.
Find the empirical formula of the compound (work to up to two decimal places). [Na = 23,P = 31,O = 16]