Question

a sample of ammonium phosphate contains 3.18moles of hydrogen atoms.the number of moles of oxygen atoms in the sample is

Answer 1

Ok , so basically, 1 mole of ammonium phosphate(molecules) has 12 moles of hydrogen(atoms). We need to find out how much ammonium phosphate has 3.18 moles of hydrogen .

Simple , Unitary method. We find that 0.265 moles of ammonium phosphate has 3.18 moles of hydrogen. We also know that 1 mole of ammonium phosphate has 4 moles of oxygen. Again, using the Unitary method , we find that 0.265 moles of ammonium phosphate has 1.06 moles of oxygen .

Answer 2

$\Huge\blue{\mathfrak{\underline{\underline{answer}}}}$

$\large\red{\textbf{1.06 moles}}$

$\Huge\blue{\mathfrak{\underline{\underline{Solution}}}}$

→ 1 mole of (NH4)3PO4 will contain 12 mole H- atom

→ So, 3.18 mole of H-atom will be present in

→ 1/12 × 3.18 moles of (NH4)3PO4

= 0.265 moles of (NH4)3PO4

→ 1 mole of (NH4)3PO4 contains 4 moles of H-atom.

→ So, 0.265 (NH4)3PO4 will contain

→ 4×0.265 = 1.06 moles of oxygen atoms.