Calculate the molar mass for each of the following:

a. $\mathrm{KCl}$, salt substitute

b. ${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{NO}}_2$, niacin (vitamin $\mathrm{B}3$) needed for cell metabolism

c. ${\mathrm{C}}_{19}{\mathrm{H}}_{20}{\mathrm{FNO}}_3$, Paxil, antidepressant

We have to find the molar mass of$\mathrm{KCl}$

We know that,

Molar mass of one $\mathrm{K}$atom =localid="1653486461042" $39.09\mathrm{g}$

Molar mass of one $\mathrm{Cl}$atom =localid="1653486469818" $35.45\mathrm{g}$

So, the molar mass of$\mathrm{KCl}$=$39.09+35.45$=localid="1653486479809" $74.54\mathrm{g}$

We have to find the molar mass of${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{NO}}_2$

We know that,

Molar mass of one $\mathrm{C}$atom =localid="1653486492436" $12.01\mathrm{g}$

Molar mass of one $\mathrm{H}$atom =localid="1653486501953" $1.00\mathrm{g}$

Molar mass of one $\mathrm{N}$atom =localid="1653486510748" $14.00\mathrm{g}$

Molar mass of one $\mathrm{O}$atom =localid="1653486522035" $15.99\mathrm{g}$

So, the molar mass of${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{NO}}_2$=$6\left(12.01\right)+5\left(1.00\right)+14.00+2\left(15.99\right)$=localid="1653486531114" $123.04\mathrm{g}$

We have to find the molar mass of ${\mathrm{C}}_{19}{\mathrm{H}}_{20}{\mathrm{FNO}}_3$

We know that,

Molar mass of one $\mathrm{C}$atom =localid="1653486543634" $12.01\mathrm{g}$

Molar mass of one $\mathrm{H}$atom =localid="1653486554674" $1.00\mathrm{g}$

Molar mass of one $\mathrm{F}$atom =localid="1653486562725" $18.99\mathrm{g}$

Molar mass of one $\mathrm{N}$atom =localid="1653486571049" $14.00\mathrm{g}$

Molar mass of one $\mathrm{O}$atom = localid="1653486583828" $15.99\mathrm{g}$

So, the molar mass of ${\mathrm{C}}_{19}{\mathrm{H}}_{20}{\mathrm{FNO}}_3$= $19\left(12.01\right)+20\left(1.00\right)+18.99+14.00+3\left(15.99\right)$

=localid="1653486595327" $329.15\mathrm{g}$