What is the empirical formula of the compound which has the following percentage composition C = 80 %, H = 20 %?

Question

What is the empirical formula of the compound which has the following percentage composition C = 80 %, H = 20 %? (A) C2H5 (B) CH4 (C) CH3 (D) C3H8

Tardigrade Admin · Accepted Answer

beginmatrixC&H 80 %&20 % endmatrix Moles → beginmatrix(80/12)&(20/1) 6.66&20 endmatrix Moles ratio → beginmatrix(6.66/6.66)&(20/6.66) 1&3 endmatrix ∴ Empirical Formula ⇒ CH3

Q. What is the empirical formula of the compound which has the following percentage composition $C = 80%, H = 20%$ ?

$C_{2} H_{5}$

$C H_{4}$

$C H_{3}$

$C_{3} H_{8}$

$C 80% H 20%$
Moles $\to$ $\frac{80}{12} 6.66 \frac{20}{1} 20$
Moles ratio $\to$ $\frac{6.66}{6.66} 1 \frac{20}{6.66} 3$
$∴$ Empirical Formula $\Rightarrow C H_{3}$

Q. What is the empirical formula of the compound which has the following percentage composition C=80%,H=20%?

C2​H5​

CH4​

CH3​

C3​H8​