Consider the reaction:
2Mn(s) +O2(g) => Mn2O3(s);AH° = -959.0 kJ
Find AH for the following reaction:
2Mn2O3(s) => 4Mn(s) + 302(g)
+959.0 kJ
+1918 kJ
-3836 kJ
O-1918 kJ
+3836 kJ

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.

What prefix multiplier is appropriate for reporting a measurement of 5.57 ×10−5 m?

What happens to the concentration of hydronium ions as the ph of a solution increases? a. hydronium ion concentration stays the same b. hydronium ion concentration decreases c. hydronium ion concentration increases