  In this study, we use a one-zone leptonic and a lepto-hadronic model to
investigate the multi-wavelength emission and the prominent flare of the flat
spectrum radio quasar 3C 454.3 in Nov 2010. We perform a parameter study with
both models to obtain broadband fits to the spectral energy distribution of 3C
454.3. Starting with the baseline parameters obtained from the fits, we then
investigate different flaring scenarios for both models to explain an extreme
outburst and spectral hardening of 3C 454.3 that occurred in Nov 2010. We find
that the one zone lepto-hadronic model can successfully explain both the
broadband multi-wavelength spectral energy distribution and light curves in the
optical R, Swift XRT and Fermi gamma-ray bandpasses for 3C 454.3 during
quiescence and the peak of the Nov. 2010 flare. We also find that the one-zone
leptonic model produces poor fits to the broadband spectra in the X-ray and
high energy gamma-ray band passes for the Nov. 2010 flare.
