KCET2008ChemistrySome Basic Concepts of Chemistry
Three moles of PCl ₅ , three moles of PCl ₃ and two moles of Cl ₂ are taken in a closed vessel. If at equilibrium the vessel has 1.5 moles of PCl ₅ , the number of moles of PCl ₃ present in it is
Options
- A5
- B3
- C6
- D4.5
Correct answer
D. 4.5
Step-by-step solution
PCl ₅ PCl ₃+ Cl ₂3 ~mol 3 ~mol 2 ~mol initially (3-x) mol (3+ x ) mol (2+ x ) mol at equilibrium 3-x=1.5 x=1.5 Number of moles of PCl ₃=3+ x =3+1.5=4.5