I used the fugacity formula and got 8.26 just seeing what I am doing wrong to not get around 7.10?

The following experimental data are available for a particular molecule at 471 K. Hvap = 29.1 kJ/mol. ptit = 1.406 - 104 mol/m, psat = 10.0 bar, and B= -7.267 10 4 m/mol. The fugacity of this substance (in units bar) at P = 8.3 bar is Make sure to upload your solution procedures under Problem 1. (17.07,7.17])