A hydrocarbon has the molecular mass 70. Write all the possible structural isomers and give their IUPAC names

Explanation

To solve the problem of finding all possible structural isomers of a hydrocarbon with a molecular mass of 70, we can follow these steps:

### Step 1: Determine the Molecular Formula
1. The molecular mass of the hydrocarbon is 70 g/mol.
2. The molecular formula for hydrocarbons can generally be represented as \( C_nH_m \).
3. The atomic mass of carbon (C) is approximately 12 g/mol, and that of hydrogen (H) is approximately 1 g/mol.
4. We need to find integers \( n \) and \( m \) such that \( 12n + m = 70 \).

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