Guvu
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classifying everyday processes
classify each process according to direction of heat flow.
evaporation of alcohol from skin: liquid c3h80 +5.2 kj → vaporized c3h2o
burning of propane in a gas grill: c3hg +502 → 3c02 + 4h20 + 1652 kj
oxidation of iron to form rust: 4fe + 302 → 2fe2o3 + 2221 kj
heat flows in
heat flows out

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.