Measurements show that unknown compound has the following composition: element mass 38.7 % calcium, 19.9 % phosphorus and 41.2 % oxygen. write the empirical chemical formula of this compound?
(a) ca2po4
(b) ca3po6
(c) ca4p2o4
(d) ca3p2o8 (or ca3(po4)2)
(e) capo4
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