91Ó°ÊÓ

We need to find the number of moles in $4$g of $Au$.

Here we need to find number of moles , and formula for it is ;

Number of moles=gram molecular weight/molar mass .

We are given with the gram molecular weight , and we know the molar mass for this element , so we get ;

Therefore,$\frac{4\cancel{g}}{196.9\cancel{g}/moles}=0.02$moles

We need to find the number of moles in $4$g of $Sn{O}_2$.

Here we need to find number of moles , and formula for it is ;

Number of moles=gram molecular weight/molar mass

We are given with the gram molecular weight , and we know the molar mass for this element , so we get ;

Therefore,$\frac{4\cancel{g}}{150.71\cancel{g}/moles}=0.026$moles

We need to find the number of moles in$4$gof$C{S}_2$.

Here we need to find number of moles , and formula for it is ;

Number of moles=gram molecular weight/molar mass

We are given with the gram molecular weight , and we know the molar mass for this element , so we get ;

Therefore,$\frac{4\cancel{g}}{76.13\cancel{g}/moles}=0.052$moles

We need to find the number of moles in $4$g of $C{a}_3{N}_2$.

Here we need to find number of moles , and formula for it is ;

Number of moles=gram molecular weight/molar mass

We are given with the gram molecular weight , and we know the molar mass for this element , so we get ;

Therefore,$\frac{4\cancel{g}}{148.25\cancel{g}/moles}=0.026$moles

We need to find the number of moles in $4$gof $C_6{H}_8{O}_6$.

Here we need to find number of moles , and formula for it is ;

Number of moles=gram molecular weight/molar mass

We are given with the gram molecular weight , and we know the molar mass for this element , so we get ;

Therefore,$\frac{4\cancel{g}}{176.12\cancel{g}/moles}=0.022$moles