Your supervisor has just stopped by your desk and is frantic. She has a meeting with the senior vice president in 25 minutes and has misplaced some data. She needs to report the fugacity of n-pentane at 192°C and 1.8 MPa in a mixture of 13.7 mol % n-pentane, 32.1 mol % n-butane, 21.5 mol % isobutane, and 32.7 mol % n-hexane, and the number needs to be as correct as possible. Calculate the value for the fugaciy of n-pentane in this mixture.