A closed container contains a gas mixture of No, Ne, and He, which has a total pressure of 28. 7 atm. If the partial pressures of Ne and He are 6. 20 and 2. 30 atm, respectively, What is the mole fraction of N»?.

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

You mix the pks of succinic acid are 4.21 and 5.64. how many gramsa graduate student at sdsu wants to measure the activity of a particular enzyme at ph 4.0. to buffer her reaction, she will use a buffer system based on one of the acids listed below, which acid is most appropriate for the experiment? of monosodium succinate (fw = 140 g/mol) and disodium succinate (fw = 162 g/mol) must be added to 1 l of water to produce a solution with a ph 5.28 and a total solute concentration of 100 mm? (assume the total volume remains 1 liter, answer in grams monosodium succinate, grams disodium succinate, respectively.) volumes of 0.05 m nah2po4 and 0.05 m na2hpo4 (pk's for phosphoric acid are 2.15, 6.82 and 12.38). which of the following best describes the resulting solution?

Avariable that is not being directly tested during an experiment should be