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  4. A sample of ammonium phosphate, ( NH 4)3 PO 4, 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, $\left( NH _{4}\right)_{3} PO _{4},$ contains 3.18 moles of hydrogen atoms. The number of moles of oxygen atoms in the sample is:

Some Basic Concepts of Chemistry

Solution:

If $3.18 \, mol$ of hydrogen atom are there, then number of moles of oxygen atoms

$=\frac{3.18}{2}\, mol =1.06\, mol$