Final answer:
The composition of the hypereutectoid iron-carbon alloy is 0.892.
Step-by-step explanation:
The mass fraction of eutectoid cementite in a hypereutectoid iron-carbon alloy can be used to determine the composition of the alloy. In this case, the student has provided that the mass fraction of eutectoid cementite is 0.108. The composition of the alloy is then the complement of the eutectoid cementite, which is 1 - 0.108 = 0.892. Therefore, the composition of the alloy is 0.892.