How many moles of hypochlorous acid are needed to react with 0.257 mol of 9-fluorenol?

Molecular weight of hypochlorous acid = 52.46 g/mol
MW of 9-fluorenol = 182.22 g/mol

2 answers

Write and balance the equation, then follow the steps in this worked example of a stoichiometry problem.
http://www.jiskha.com/science/chemistry/stoichiometry.html
The answer is much less difficult to find. The answer for your problem is 0.257 mol because there is a 1:1 ratio of hypochlorous acid to 9-fluorenol.