# Alkanes have the general molecular formula #C_nH_(2n+2)#. Thus, when #n= 1#, the alkane is #CH_4#, when #n = 2#, the alkane is #C_2H_6# etc. If an alkane has a molar mass between 140 and 150, what is the alkene?

##### 1 Answer

Dec 1, 2016

The required alkane is a **Decane #(C_10H_22)#**.

#### Explanation:

This is a simple calculation.

The general formula for alkanes is

So, an alkane having 10 carbon atoms will surely have 22 hydrogen atoms, according to the given formula.

So, the molar mass of decane is equal to:

Now, 142 lies between 140 & 150.

So, the alkane is **Decane**.