Double the number of carbon atoms and add two.
Alcohols are organic compounds of general molecular formula, ROH where R represents any alkyl moiety.
Alkanes have the general molecular formula RH where R contains the longest carbon chain.
If i want to obtain the number of hydrogen atoms that should be in an alkane derived from an alcohol, all i need to do is to double the number of carbon atoms in the alcohol and add two to the number. I will then arrive at the number of hydrogen atoms that should be in the corresponding alkane.
For instance; ethanol has two carbon atoms. To obtain the number of hydrogen atoms in ethane, i just need to double the two carbon atoms and add two. That gives me six hydrogen atoms in ethane.
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