Question

A hydrocarbon has the molar mass 26.04 g/mol. what is a possible formula

Answer 1

C2H2 is the possible formula i think .

Answer 2

Answer: The molecular formula of the hydrocarbon will be $C_2H_2$.

Explanation:

Molar mass of the hydrocarbon = 26.04 g/mol

Let the molecular formula of hydrocarbon be $C_xH_y$

If the given hydrocarbon is alkane :$C_nH_{2n+2}$

$n\times 12+(2n+2)\times 1=26.04$

n = 1.75, not possible so we will reject this.

If the given hydrocarbon is alkene :$C_nH_{2n}$

$n\times 12+(2n)\times 1=26.04$

n = 1.85 ,not possible so we will reject this.

If the given hydrocarbon is alkyne :$C_nH_{2n-2}$

$n\times 12+(2n-2)\times 1=26.04$

n = 2.0028, acceptable

So, the molecular formula of the hydrocarbon will be $C_2H_2$.