If 8.0g of magnesium reacts with 30.0g of molten iron(II)oxide according to the following balanced equation, what is the mass of iron produced?
3 Mg + Fe2O3 → 2 Fe+ 3 MgO(s)
What is the limiting reactant?
What is the excess reactant?
What is the theoretical yield of iron?
If 8.6 g of iron was actually produced what is the percent yield?

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.