Question

A compound contains $4$% oxygen, then the minimum molecular weight of that compound will be:

• A. $400g$
• B. $800g$
• C. $200g$
• D. $100g$

Answer 1

The correct option is A $400g$

So $1$ mole of oxygen $=16grams$

For the Molecular weight of the molecule to be least, no of oxygen moles should be $1$.

Let's assume that there are $16$ gms of oxygen present in the compound, which should be $4$% of the total molecular mass.

$\frac{4x}{100}=16gm$

$4x=1600gm$

Therefore,$x=400grams$

Hence, option $A$ is correct.