91Ó°ÊÓ

We need to find number of moles in $85.2$gof$Ni$ .

Here, we need to calculate number of moles , we will use the formula for number of moles

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

Number of moles=gram molecular weight/molar mass

Therefore,$\frac{85.2\cancel{g}}{58.69\cancel{g}/moles}=1.45$moles

We need to find number of moles of$144$gof$K$ .

Here, we need to calculate number of moles , we will use the formula for number of moles

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

Number of moles=gram molecular weight/molar mass

Therefore, $\frac{144\cancel{g}}{39.09\cancel{g}/moles}=3.68$moles

We need to find number of moles of $6.4$gof$H_{2}O$.

Here, we need to calculate number of moles , we will use the formula for number of moles

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

Number of moles=gram molecular weight/molar mass

Therefore,$\frac{6.4\cancel{g}}{18\cancel{g}/moles}=0.35$moles

We need to find number of moles of$308$gof$BaS{O}_4$ .

Here, we need to calculate number of moles , we will use the formula for number of moles

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

Number of moles=gram molecular weight/molar mass

Therefore,$\frac{308\cancel{g}}{233\cancel{g}/moles}=1.32$moles

We need to find number of moles of$252.8$gof fructose .

Here, we need to calculate number of moles , we will use the formula for number of moles

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

Number of moles=gram molecular weight/molar mass

Therefore,$\frac{252.8\cancel{g}}{180.1\cancel{g}/moles}=1.40$moles