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  4. A sample of ammonium phosphate ( NH 4)3 PO 4 contains 3.18 moles of H -atom. The number of moles of O- atom in the sample is

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Q. A sample of ammonium phosphate $\left( NH _{4}\right)_{3} PO _{4}$ contains $3.18$ moles of $H$ -atom. The number of moles of $O-$ atom in the sample is

ManipalManipal 2013

Solution:

Number of moles of $O$ atoms $=\frac{1}{3}$ moles of $H$ atoms
$=\frac{1}{3} \times 3.18=1.06 \,mol$