Amixture of he, ne, and ar gases at a particular temperature has partial pressures of 0.75 atm he, 0.30 atm ne, and 0.62 atm ar. which of the following shows the correct trend for the mole fractions of the component gases? latex: \chi_{ar}< \chi_{ne}< \chi_{he} χ a r < χ n e < χ h e χ a r < χ n e < χ h e latex: \chi_{he}< \chi_{ar}< \chi_{ne} χ h e < χ a r < χ n e χ h e < χ a r < χ n e latex: \chi_{he}< \chi_{ne}< \chi_{ar} χ h e < χ n e < χ a r χ h e < χ n e < χ a r latex: \chi_{ne}< \chi_{ar}< \chi_{he}

A3.37-mg sample of protein was chemically digested to convert its nitrogen into ammonia and then diluted to 100.0 ml. then 10.0 ml of this solution was placed in a 50-ml volumetric flask and treated with 5 ml of phenol solution plus 2 ml of sodium hypochlorite solution. the sample was diluted to 50.0 ml, and the absorbance at 625 nm was measured in a 1.00-cm cuvette and found to be 0.486. for reference, a standard solution was prepared from 10.0 mg of nh4cl (molar mass = 53.49 grams/mole) dissolved in 1.00 l of water. then 10.0 ml of this standard was placed in a 50-ml volumetric flask, treated in the same manner as the unknown, and the absorbance found to be 0.323. finally, a reagent blank was prepared using distilled water in place of unknown, it was treated in the same manner as the unknown, and the absorbance found to be 0.076. calculate the weight percent of nitrogen in the protein.

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

What is the molar mass of a gas that has density of 2.054 g/l