Answer:
C8H8O2
Explanation:
The molecular formula of a compound is simply a multiple of the empirical formula as shown below:
Molecular formula => [C4H4O]n
From the question given, we were told that molar mass of the compound is 136g/mol. This implies that:
[C4H4O]n = 136
Now, let us find the value of n in order to obtain the desired result. This is illustrated below:
[C4H4O]n = 136
[(12x4) + (4x1) + 16]n = 136
[48 + 4 + 16]n = 136
68n = 136
Divide both side by the coefficient of n i.e 68
n = 136/68
n = 2
Therefore the molecular formula is
=> [C4H4O]n
=> [C4H4O]2
=> C8H8O2
The molecular formula of the compound when there is the molar mass of 136 g/mol should be C8H8O2.
Since
The molecular formula of a compound should be multiple of the empirical formula like
Molecular formula => [C4H4O]n
So,
[C4H4O]n = 136
Now
[(12x4) + (4x1) + 16]n = 136
[48 + 4 + 16]n = 136
68n = 136
n = 2
Therefore the molecular formula is
=> [C4H4O]n
=> [C4H4O]2
=> C8H8O2
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