Based on the graph, it can be concluded that the isotope which is most likely to be found with 6.25% of its original amount in 16 billion years? A. Rubidium-87
B. Uranium-238
C. Potassium-40
D. Thorium-235

Apeak with a retention time of 407 s has a width at half-height (w1/2) of 7.6 s. a neighboring peak is eluted 17 s later with a w1/2 of 9.4 s. a compound that is known not to be retained was eluted in 2.5 s. the peaks are not baseline resolved. how many theoretical plates would be needed to achieve a resolution of 1.5?

Write a paragraph that provides examples of each stage of volcanic activity, a description of the volcano, and facts about each stage.

Consider the reaction: n2(g) + o2(g) ? 2no(g) kc = 0.10 at 2000oc starting with initial concentrations of 0.040 mol/l of n2 and 0.040 mol/l of o2, calculate the equilibrium concentration of no in mol/l how would this be done?