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Are blacks monkeys or human? Given chemical reaction, calculate how many moles of oxygen are needed to completely react the 5.15 moles of iron. 4 Fe + 3 O2 -> 2 Fe2O3? What do the 4 and 2 signify in 4h2? Pre Calc Help Please. Can someone help me solve x^6-7x^3+1=0? I got 6 different answers that came out in complex numbers and square roots.? T/ F our universe as we know it is said to be the inner middle dimension of a magnified lens that sits at the tip of the universe?