If the magnet loses its superconducting properties, all of the liquid helium could suddenly turn to a gas. Use the ideal gas law, PV = nRT, to determine how many liters of Helium gas would be formed from 1 L of Helium liquid at 1 atm pressure and 25°C. 1 L of liquid Helium contains 31.25 mol Helium. (The gas constant is 0.0821 L atm/mol K.) Show your work. (3 points)
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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.
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