This is a reactor design stoichiometry question.

2a + 3b \rightarrow c + d this is the main reaction

2c \rightarrow e + f this is a side reaction

start with 100 moles of a, b is in excess (not limiting)

fraction conversion of a is 75%

fractional conversion of c is 5%

can you tell me final composition of c in moles at the end of the reaction and how you got it?