Question

Calculate the molar mass of the followings:

$A)$ $H_{2}O$

$B)$ $C{O}_2$

$C)$ $C{H}_4$

Answer 1

$A)$ Molar mass of $H_{2}O$
Description

Since in the molecular formula of $H_{2}O$, it has $2$ atoms of hydrogen element and $1$ atom of oxygen element.

So, molecular weight of $H_{2}O$

$=(2\times \text{Atomicweightofhydrogen)+(1}\times \text{Atomicweightofoxygen})$

$M_{H_{2}O}=(2\times 1.008)+(1\times 16.00)$

$M_{H_{2}O}=18.02u$

Hence, the molar mass of $H_{2}O=18.02g/mol$

$B)$ Molar mass of $C{O}_2$

Description

Since in the molecular formula of $C{O}_2,$ it has $1$ atom of carbon element and $2$ atoms of oxygen element.

So, molecular weight of $C{O}_2$

$=(1\times \text{Atomic weight of carbon}+(2\times \text{Atomic weight of oxygen}\left)\right)$

$M_{C{O}_2}=12.011+2\times 16.00$

$M_{C{O}_2}=44.011u$

$C)$ Molar mass of $C{H}_4$

Since in the molecular formula of $C{H}_4$ it has $1$ atom of carbon element and $4$ atoms of hydrogen element.

So, its milecular mass will be

So,molecular weight of $C{H}_4$

$=(1\times \text{Atomic weight of carbon}+(4\times \text{Atomic weight of hydrogen}\left)\right)$

$M_{C{H}_4}=12.011+4\times 1.008$

$M_{C{H}_4}=16.043u$