Chemistry - Mole Concept Question with Solution | TestHub

Explain Question: Identify the sum $(p+q)$.

Concept: Percentage determination of elements.

Solution

$C_4{H}_5{N}_a{O}_b$ gives $a$ mol NH₃.

$w$ gives $(17a{)}_g$ NH₃.

$$M.w=\frac{9.9\times 1.7}{17}a$$

9.9 gives 1.7 g NH₃ = 99$a$.

$\%N=\frac{14a}{99a}\times 100=14.14\%$

$\%O=33.33\%$

Therefore, the ratio of N and O atoms is:

$$\frac{14.14}{14}:\frac{33.33}{16}=1:2$$