posted by sean on .
81) According to the following thermochemical equation, what mass of HF (in g) must react in order to
produce 345 kJ of energy? Assume excess SiO2.
SiO2(s) + 4 HF(g) SiF4(g) + 2 H2O(l) DH°rxn = -184 kJ
A) 173 g B) 37.5 g C) 150. g D) 107 g E) 42.7 g