How many mole of each reactant are needed to produce 6.00 moles of hf

Ithink that the answer is b

Answer the same molecular formula;

The internal energy of the system we can term it as total potential energy and kinetic energy. energy flows out of the surrounding from the system then we can say that the internal energy of the final state is lower than its initials. the sign of  δesystem is negative.δesystem = efinal - einitial=-ve  efinal  ∠einitial.

What is your question i dont understand well sorry