The total pressure inside a vessel containing a mixture of neon, argon, and helium gases is 750 kpa. the partial pressure of neon is 230 kpa, and the partial pressure of argon is 250 kpa. what is the partial pressure of helium? 480 kpa 270 kpa 500 kpa 520 kpa 325 kpa

The following reaction shows sodium carbonate reacting with calcium hydroxide. na2co3 + ca(oh)2 → naoh + caco3 how many grams of naoh are produced from 20.0 grams of na2co3? (molar mass of na = 22.989 g/mol, c = 12.01 g/mol, o = 15.999 g/mol, ca = 40.078 g/mol, h = 1.008 g/mol) 12.2 grams 15.1 grams 24.4 grams 30.2 grams