Write the molecular formula of an alkane with twenty carbon atoms.

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Solution

The general formula of saturated hydrocarbons like alkanes is $C_{n} H_{2 n + 2}$ here n is the number of Carbon atoms ( $C$ ) that are present in the compound.
As it is given that 20 Carbon ( $C$ ) atoms are present so by putting the value of n=20, we will get: $C_{20} H_{2 \times 20 + 2} = C_{20} H_{42}$
Thus, the molecular formula of an alkane will be $C_{20} H_{42}$ .

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