A sample of ammonia phosphate

CHEMISTRY · Single correct · A Level · Chemistry · Amount of substance · Amount of substance

Problem

A sample of ammonia phosphate,

(\text{NH}_4)_3\text{PO}_4

contains 6.36 moles of H-atoms. The number of moles of O-atom in the sample is (Atomic mass of

\text{N} = 14.04

\text{H} = 1

\text{P} = 31

and

\text{O} = 16

). (a) 0.265 (b) 0.795 (c) 2.12 (d) 4.14