Question

a sample of Ammonium Phosphate contains 3.18 moles of hydrogen atoms the number of moles of oxygen atoms in the sample is

Answer 1

in (NH4)3 PO4
N=3
H=12
P=1
O=4
so 12 moles of hydrogen corresponds to 4mole of oxygen, so let X moles of oxygen corresponds to 3.18 moles of hydrogen,
x÷4=3.18÷12
X =1.06 moles of oxygen
I hope you understood

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.