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Calculate enthalpy for the following reaction A) Ca0(s) + 2HCl(g) => CaCl2(s) + H2O(g) B) 4FeO(s) +O2(g) => 2Fe203(s)? Find the exact value of x? How long does it take for an intelligent person (130-140 IQ) to figure puzzles and riddles out? It takes me some time.? If you can invent something, what possible inventions can you invent? When solving the system of equations 6x + 2y = -1 & -x + 10y = 5 by Cramer's rule, what are values of D, Dx, & Dy? See image for answers?