Chemistry - Mole Concept Question with Solution | TestHub

(i) As per molecular formula

$\text{C}{\text{H}}_2\text{O}=12+2+16=30$

(ii) As we know in case of percentage, the total mass$=100$

(iii) When total mass$=30$

the mass of oxygen$=16$

So, when total mass$=100$

Percentage of oxygen$=\frac{16\times 100}{30}=53.33\text{\%}$