A chemist must prepare 0.9 L of sodium hydroxide solution with a pH of 13.40 at 25 C. He will do this in three steps: Fill a 0.9 L volumetric flask about halfway with distilled water. Weigh out a small amount of solid sodium hydroxide and add it to the flask. Fill the flask to the mark with distilled water. Calculate the mass of sodium hydroxide that the chemist must weigh out in the second step

(05.04 mc) the table below shows the set of traits in four different beetle populations. traits in population population traits 1 brown-colored beetles, pesticide-resistant gene present 2 green-colored beetles, pesticide-resistant gene absent 3 green and brown–colored beetles, pesticide-resistant gene absent 4 green and brown−colored beetles, pesticide-resistant gene present which population of beetles is most likely to become extinct when the existing conditions change? (4 points) select one: a. 1 b. 2 c. 3 d. 4