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 (1)0.265
(2)0.795
(3)1.06
(4)4.00
1.06
To determine the number of moles of oxygen atoms in the sample of ammonium phosphate, we first need to understand the chemical formula of ammonium phosphate.
The chemical formula of ammonium phosphate is (NH4)3PO4. This means that there are three ammonium ions (NH4+) and one phosphate ion (PO43-) in the compound.
In the ammonium ion (NH4+), there are 4 hydrogen atoms (H). So, for the given sample, if we have 3.18 moles of hydrogen atoms, we can calculate the moles of ammonium ions.
1 mole of ammonium ion (NH4+) contains 4 moles of hydrogen atoms (H).
Therefore, the moles of ammonium ions = (moles of hydrogen atoms) / (4 moles of hydrogen atoms/mole of ammonium ions) = 3.18 moles / 4 = 0.795 moles of ammonium ions.
In the phosphate ion (PO43-), there are 4 oxygen atoms (O). So, for the given sample, the number of moles of oxygen atoms will be the same as the number of moles of phosphate ions.
Therefore, the number of moles of oxygen atoms in the sample is 0.795 moles.
Hence, the correct option is (2) 0.795.