I have been having a problem with solving a chemistry problem. The problem requires finding the density in copper at 1305K (the temperature changes when you reset the problem). I think I am using the proper formula, (N_v/N_s=Ae^-changeH_v/kT). My results are a very large number. There is also a negative sign which complicates the problem further. This is my last shot and I spent a long time trying to find my error. There must be some sort of calculation error.I can use some help. Thanks

Question

I have been having a problem with solving a chemistry problem. The problem requires finding the density in copper at 1305K (the temperature changes when you reset the problem). I think I am using the proper formula,  (N_v/N_s=Ae^-changeH_v/kT). My results are a very large number. There is also a negative sign which complicates the problem further. This is my last shot and I spent a long time trying to find my error. There must be some sort of calculation error.I can use some help. Thanks