Question

According to the following thermochemical equation, what mass of H2O (in g) must form in order to produce 975 kJ of energy?

SiO2(s) + 4 HF(g) → SiF4(g) + 2 H2O(l), ΔH°rxn = -184 kJ

Answer 1

184 kJ energy released in the formation of 2 moles(36 g) H2O. So
36.0 g H2O x (975 kJ/184 kJ) = ??

Answer 2

45

Answer 3

what mass of Mg combines with 5.80 L of O2 measured at STP

Answer 4

190.8