Answer:
The balanced equation is telling us that for every 5 moles of F2 that react, 6 moles of HF are produced.
To find out how many moles of HF would be produced if we have 2.42 moles of F2, we can use the following conversion:
moles of HF = (moles of F2) x (moles of HF/moles of F2)
moles of HF = (2.42 moles) x (6 moles / 5 moles)
moles of HF = 2.92 moles
So 2.92 moles of HF would be produced if you reacted 2.42 moles of F2.