Please explain what is my mistake, the value i got for V/F = 4.27 which is clearly wrong, because it should be between 0 & 1. i saw the solution for this problem in chegg and I followed the same steps but they got V/F = 0.47 which is correct i guess. Please explain what I did wrong, and how to correct it

Q2. A feed stream containing a mixture of 40% n-butane, 30% n-pentane and 30% n- hexane flows into a flash unit. The flash temperature is 290 K and the flash pressure is 8.7 psi. What is the ratio of the exit vapor flow rate to the feed flow rate? What are the compositions of the exit streams? Assume ideal mixture. 111 -F - 1 290 187 psi 30 X, ? Way 2. n-butane 40 2-pestre 2, n-hexane Apply Antoine equation to Freed pa Component A B n-butane 439976*79.521 In-pentane 3.9892 1070617 -40.454 2.071 in-hexane This pareters (A, B, anc) one taken from MIST) site- P- 8.7 pil 1 stm (1.01325 bar 14-696 psi 1. gilim P = 0.6 bar 4.00266 171.53 3.784 -48-184 A- B ) log, pret 4.35576 - 1175.58 270 - 2.071 [4395-75 521)/(290-2-1)] 10 23892 - (7.610/1270-40 -40.45] [40266-21-55)/(290-48 784)] port 10 1.87 bar 10 05 bar 0.14 bar Lor Ppun [zient) -(4130) 63805) +0.3** 14) - 094b4 PDEN- 2 (/pt") 1 (-4/1:87)+(3/5)+(-3/0-14) 0.34 bar PDEW