Ammonium sulphate;(NH2),504, is an inorganic salt with a number of commercial uses. The most common use is as a soil fertilizer. The density of 12.5 molal
(NH4)2SO4 solution is 1.77 g/mL at 25 °C. Calculate:
(a) the mole fraction of (NH4)2SO, 0.1837
(b) the molarity of (NH4)2SO4. 8.35M
(c) the percentage by mass of (NH.)2SO4. 62.282

What is the chemical name of the compound na2co3? use the list of polyatomic ions and the periodic table to you answer. a. sodium carbon oxide b. sodium carbonate c. sodium(ll) carbonate d. sodium oxalate

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.

Athe top of a hill, an athlete on a skateboard has x joules of mechanical energy. how much mechanical energy will she have at the bottom of the hill? ignore the effects of friction.