Pentaborane, Bs Ha, was once i Studied asYatpotentials roCket fuel.)calculate Srutthe heat given Offocwhen 1o mole Of pentaborane reactSocwith excess ing 2 Bs Hq (g)+ 120z(g) 5BzOś (8)+ 9 H,0(9). a ccordi to use the AHf values: following use · AHf = Bslta (g) = 73.2 KJ/ mol %3D • AHf =BzO3 (S) = - 1272 K)/mo. =-24).83 K/mol 131

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