- Is Radian a fundamental unit in physics?

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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? Need help with chem!! Which of the following solutions are acidic? pH = 6 pH = 3 [H3O+] = 2.5 x 10-8 M [H3O+] = 4.9 x 10-10 M? What is the product of x^2 − 2x + 3 and x + 1? Polar solute are soluble in blank solvents.? Solve -2x^+18=7x solve by using the quadratic?