Alkanes are called saturated hydrocarbons with the general formula CnH2n + 2.
Relative atomic mass of carbon = 12, relative atomic mass of hydrogen = 1
The molecular weight of a substance for the general formula will be calculated as follows: 12 * n + 1 * (2n + 2)
In our case, the molecular weight is known, which means you can write an equation with one unknown and solve it:
12 * n + 1 * (2n + 2) = 100
12n + 2n +2 = 100
14n + 2 = 100
14n = 100 – 2
14n = 98
n = 98/14
n = 7
So our substance has the formula C7H16 (heptane). Let’s check: 12 * 7 + 1 * 16 = 100
The number of hydrogen atoms in a heptane molecule is 16
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