What are the oxidation numbers of the atoms in this reaction? check all that apply. ch4(g) + 2o2(g) → co2(g) + 2h2o(g) -4 for c in ch4 +4 for c in co2 -2 for o in all substances +1 for h in both ch4 and h2o +4 for o in h2o

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.