Please help me !

Question

Cyanogen gas, C₂N₂, has been found in the gases of outer space. It can react with fluorine to form carbon tetrafluoride and nitrogen trifluoride.

C₂N₂(g) + 7F₂(g) → 2CF₄(g) + 2NF₃(g)

How many moles of fluorine will yield 5.900 mol of nitrogen trifluoride?

Answer 1

So you start with a value in moles. You are trying to go from mole of nitrogen trifluoride to Fluorine. What is the mole to mole ratio (or coefficients) of the 2 species. 2NF₃(g) and 7F₂(g) so 2:7

5.900mol NF₃ x 7moles F₂ = moles of F₂

2 moles NF₃

You need to cancel out moles of NF₃ to cancel out so one value must be a numerator and the other must be a denominator