What is the mole fraction of urea in a solution that contains 2.1 mol of urea and 4.4 mol of water?

10-14. (a) when 100.0 ml of weak acid ha were titrated with 0.093 81 m naoh, 27.63 ml were required to reach the equivalence point. find the molarity of ha. (b) what is the formal concentration of a- at the equivalence point? (c) the ph at the equivalence point was 10.99. find pk. for ha. (d) what was the ph when only 19.47 ml of naoh had been added?

How have the greenhouse gasses increased from the year 2000 to 2018

What can be found in the ionosphere