The interhalogen ClF_x has been used as a rocket fuel. It reacts with hydrazine to form the gases hydrogen fluoride, nitrogen, and chlorine. In one study of this reaction, ClF_x gas is introduced into a rigid container until a pressure of 1.2 atm is reached.
Gaseous hydrazine is then introduced until the total pressure is 3.0 atm. Reaction is then allowed to proceed at constant temperature until completion. The final pressure in the flask is 6.0 atm, which includes 0.9 atm due to excess hydrazine.

(a) What is the formula of the interhalogen?

(b) Write the chemical equation for its reaction with hydrazine.