Which of the following choices represents a solution with pH 11.7? a) 50mL of 0.005 M KOH solution
b) 100mL of 0.01 M KOH solution
c) 200mL of 0.01 M KOH solution
d) 400mL of 0.005 M Ca(OH)2 solution

Agas mixture with a total pressure of 745 mmhg contains each of the following gases at the indicated partial pressures: co2, 245 mmhg ; ar, 119 mmhg ; and o2, 163 mmhg . the mixture also contains helium gas. part a what is the partial pressure of the helium gas? phe p h e = nothing mmhg request answer part b what mass of helium gas is present in a 10.2-l sample of this mixture at 283 k ? m m = nothing g request answer

According to periodic trend, which of the following most likely has the highest ionization energy? kr be ni sc

Joe shines white light into a bowl half full of water at an angle of incident of 27.5°. calculate the angle of refraction in the water given the indices of refraction for air and water are 1.00 and 1.36, respectively.