Answer
$\frac{ 4 \space moles \space HCl}{ 1 \space mole \space O_2}$ and $\frac{ 1 \space mole \space O_2}{ 4 \space moles \space HCl}$
$\frac{ 4 \space moles \space HCl}{ 2 \space moles \space Cl_2}$ and $\frac{ 2 \space moles \space Cl_2}{ 4 \space moles \space HCl}$
$\frac{ 4 \space moles \space HCl}{ 2 \space moles \space H_2O}$ and $\frac{ 2 \space moles \space H_2O}{ 4 \space moles \space HCl}$
$\frac{ 1 \space mole \space O_2}{ 2 \space moles \space Cl_2}$ and $\frac{ 2 \space moles \space Cl_2}{ 1 \space mole \space O_2}$
$\frac{ 1 \space mole \space O_2}{ 2 \space moles \space H_2O}$ and $\frac{ 2 \space moles \space H_2O}{ 1 \space mole \space O_2}$
$\frac{ 2 \space moles \space Cl_2}{ 2 \space moles \space H_2O}$ and $\frac{ 2 \space moles \space H_2O}{ 2 \space moles \space Cl_2}$
Work Step by Step
1. Use the balance coefficients to write the mole-mole equalities:
4 moles $HCl$ = 1 mole $O_2$
4 moles $HCl$ = 2 moles $Cl_2$
4 moles $HCl$ = 2 moles $H_2O$
1 mole $O_2$ = 2 moles $Cl_2$
1 mole $O_2$ = 2 moles $H_2O$
2 moles $Cl_2$ = 2 moles $H_2O$
2. Use these equalities to write the conversion factors:
$\frac{ 4 \space moles \space HCl}{ 1 \space mole \space O_2}$ and $\frac{ 1 \space mole \space O_2}{ 4 \space moles \space HCl}$
$\frac{ 4 \space moles \space HCl}{ 2 \space moles \space Cl_2}$ and $\frac{ 2 \space moles \space Cl_2}{ 4 \space moles \space HCl}$
$\frac{ 4 \space moles \space HCl}{ 2 \space moles \space H_2O}$ and $\frac{ 2 \space moles \space H_2O}{ 4 \space moles \space HCl}$
$\frac{ 1 \space mole \space O_2}{ 2 \space moles \space Cl_2}$ and $\frac{ 2 \space moles \space Cl_2}{ 1 \space mole \space O_2}$
$\frac{ 1 \space mole \space O_2}{ 2 \space moles \space H_2O}$ and $\frac{ 2 \space moles \space H_2O}{ 1 \space mole \space O_2}$
$\frac{ 2 \space moles \space Cl_2}{ 2 \space moles \space H_2O}$ and $\frac{ 2 \space moles \space H_2O}{ 2 \space moles \space Cl_2}$
