Hydrogen bromide dissociates into its gaseous elements, H2 and Br2, at elevated temperatures. Calculate the percent dissociation

Question:

Hydrogen bromide dissociates into its gaseous elements, H2 and Br2, at elevated temperatures. Calculate the percent dissociation at 375oC and 1.00 atm. What would be the percent dissociation at 375oC and 10.0 atm? Use data from Appendix C and any reasonable approximation to obtain K.