Question

Calculate the number of moles in $4.0$gof each of the following:

a. $Au$

b.$Sn{O}_2$

c. $C{S}_2$

d. $C{a}_3{N}_2$

e. $C_6{H}_8{O}_6$, vitamin C

Short answer

The number of moles in $4.00$ g of each of the following:

a.$0.02$moles

b.$0.026$moles

c. $0.052$moles

d.$0.026$moles

e.$0.022$moles

Step-by-step solution

Part (a) Step 1: Given information

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

Part (a) Step 2: Explanation

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

Part (b) Step 1: Given information

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

Part (b) Step 2: Explanation

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

Part (c) Step 1: Given information

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

Part (c) Step 2: Explanation

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

Part (d) Step 1: Given information

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

Part (d) Step 2: Explanation

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

Part (e) Step 1: Given information

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

Part (e) Step 2: Explanation

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