Will upvote an explanation.

Nitrogen trifluoride decomposes at high temperature to form nitrogen and fluorine gases according to the following equation: 2NF3(g)N2(g)+3F2(g) 2.50-L reaction vessel is initially charged with 1.22molofNF3 and allowed to come to equilibrium at 800K. Once equilibrium is established, the reaction vessel is found to contain 0.0194mol of N2. What is the value of Kp at this temperature? ( R=0.0821Latm/molK) 2.68106 1.89103 1.79104 2.77106 4.43107