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  4. A sample of ammonium phosphate, (NH4)3PO4, contains 3.18 moles of hydrogen atoms. The number of moles of oxygen atoms in the sample is

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Q. A sample of ammonium phosphate, $(NH_4)3PO_4$, contains 3.18 moles of hydrogen atoms. The number of moles of oxygen atoms in the sample is

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Solution:

In one mole of $(NH_{4})_{3}PO_{4}$, $12$ moles of hydrogen atoms $4$ moles of oxygen atoms, $3$ moles of nitrogen atoms and $1$ mole of phosphorus atoms are present
If $3.18$ mole of hydrogen atom are there, number of moles of oxygen atoms $=\frac{3.18}{3} mL$
$=1.06$ mol