In the reaction 2H2 + O2 --> 2H2O, how many moles of oxygen are required to fully react with 6.0 mol of hydrogen? A) 1.0 mol
B) 2.5 mol
C) 3.0 mol
D) 7.5 mol

If a reactant was removed, did the new equilibrium system shift to make more reactants or more products?

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Phosphoric acid is a triprotic acid ( =6.9×10−3 , =6.2×10−8 , and =4.8×10−13 ). to find the ph of a buffer composed of h2po−4(aq) and hpo2−4(aq) , which p value should be used in the henderson–hasselbalch equation? p k a1 = 2.16 p k a2 = 7.21 p k a3 = 12.32 calculate the ph of a buffer solution obtained by dissolving 18.0 18.0 g of kh2po4(s) kh 2 po 4 ( s ) and 33.0 33.0 g of na2hpo4(s) na 2 hpo 4 ( s ) in water and then diluting to 1.00 l.