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Here, we analyze the equilibrium statistical mechanics of Frenkel exciton\u2013polaritons in a planar microcavity while explicitly retaining the in-plane photon dispersion and the resulting mode counting. We then apply this framework to a thermally averaged, population-based proxy for excitation-enabled molecular chemical activity. Within a generalized Tavis\u2013Cummings description, we find that the cavity-induced change in thermal chemical activity is most pronounced for small molecular ensembles (low areal density within a given cavity mode volume) and increases with the collective coupling strength (Rabi splitting), particularly at low temperatures. These results highlight the importance of polariton dispersion and molecular-mode counting in assessing cavity modifications of thermally driven molecular reactivity.<\/jats:p>","DOI":"10.1063\/5.0345401","type":"journal-article","created":{"date-parts":[[2026,8,12]],"date-time":"2026-08-12T11:29:46Z","timestamp":1786534186000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":1,"title":["Thermal chemical reactivity in Frenkel exciton\u2013polariton cavities"],"prefix":"10.1063","volume":"165","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3653-8115","authenticated-orcid":false,"given":"Bingyu","family":"Cui","sequence":"first","affiliation":[{"name":"School of Science and Engineering, The Chinese University of Hong Kong 1 , Shenzhen, Guangdong 518172,","place":["People\u2019s Republic of China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8431-0967","authenticated-orcid":false,"given":"Abraham","family":"Nitzan","sequence":"additional","affiliation":[{"name":"Department of Chemistry, University of Pennsylvania 2 , Philadelphia, Pennsylvania 19104,","place":["USA"]},{"name":"School of Chemistry, Tel Aviv University 3 , Tel Aviv 69978,","place":["Israel"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2026,8,12]]},"reference":[{"key":"2026081207294313500_c1","doi-asserted-by":"publisher","first-page":"133","DOI":"10.1021\/ar00051a006","volume":"28","year":"1995","journal-title":"Acc. 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