Only the Fe is unbalanced.
:)
Moles of PF₃ : 4
<h3>Further explanation</h3>
A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
Reaction
![\tt P_4(s)+6F_2(g)\rightarrow 4PF_3(g)](https://tex.z-dn.net/?f=%5Ctt%20P_4%28s%29%2B6F_2%28g%29%5Crightarrow%204PF_3%28g%29)
1.25 moles of P₄(s) is reacted with 6 moles of F₂(g)
Limiting reactant : the smallest ratio (mol divide by coefficient)
P₄ : F₂ =
![\tt \dfrac{1.25}{1}\div \dfrac{6}{6}=1.25\div 1\rightarrow F_2~limiting~reactant(smallest~ratio)](https://tex.z-dn.net/?f=%5Ctt%20%5Cdfrac%7B1.25%7D%7B1%7D%5Cdiv%20%5Cdfrac%7B6%7D%7B6%7D%3D1.25%5Cdiv%201%5Crightarrow%20F_2~limiting~reactant%28smallest~ratio%29)
mol PF₃ based on mol of limiting reactant(F₂), so mol PF₃ :
![\tt \dfrac{4}{6}\times 6~moles=4~moles](https://tex.z-dn.net/?f=%5Ctt%20%5Cdfrac%7B4%7D%7B6%7D%5Ctimes%206~moles%3D4~moles)
N = (PV)/RT
(T = 88.78 + 273 = 361.78K)
(R = 22.4/273 = 0.082)
= (5.49 x 22.03)/(0.082 x 361.78) = ?
Put it into the calculator. It's hard to do that on a mobile phone.
I honestly have no clue on this one