Final answer:
The presence of a molecular ion peak at m/z 136 in the mass spectrum of compound X indicates that the molecular mass of X is 136.
Step-by-step explanation:
In compound X, the presence of a molecular ion peak at m/z 136 in its mass spectrum indicates the molecular mass of X is 136. This suggests that X is a compound with a molecular formula or empirical formula that corresponds to a molecular mass of 136.