Question

Calculate the molecular mass of the following molecules. Also, write their molar mass.

1. Sulphuric acid
   
2. $A{l}_2{O}_3$
   
3. $C_{12}{H}_{22}{O}_{11}$
   
4. $CHS{O}_4$
   
5. $K_{2}C{O}_3$
   
6. Sodium Hydroxide
   
7. $N_2{O}_4$
   
8. $N{a}_{2}S{O}_3$
   

Answer 1

Molecular mass of the following

$\left(A\right)$ $H_{2}S{O}_4=2+32+64=98amu$

$\left(B\right)$ $A{l}_2{O}_3=27\times 2+48=102amu$

$\left(C\right)$ $C_{12}{H}_{22}{O}_{11}=144+22+176=342amu$

$\left(D\right)$ $CHS{O}_4=12+1+32+64=109amu$

$\left(E\right)$ $K_{2}C{O}_3=39\times 2+12+48=138amu$

$\left(F\right)$ $NaOH=23+16+1=40g/mol$

$\left(G\right)$ $N_2{O}_4$ is $92.011g/mol$

Two nitrogen atoms

$\left(2\right)\left(14.0067g/mol\right)=28.0134g/mol$

Four oxygen atoms

$\left(4\right)\left(15.9994g/mol\right)=63.9976g/mol$

$\left(H\right)$ $N{a}_{2}S{O}_3=2\times 23+32+3\times 16=126g/mol$