On the axes provided, label pressure on the horizontal axis from o mb to 760 mb and volume on the vertical from o to 1 ml. assign values to axes divisions in such a way that you occupy almost all the space on both axes. now locate and label the points: (90, 0.9) (100, 0.8) (400, 0.2) (600, 0.15) (760, 0.1)

Caso4(s) < > ca+2 + so4^-2 ksp = [ca+2][so4^-2] = 2.4 x 10^-5 = [0.20][so4^-2] [so4^-2] =1.2 x 10^-4 ag2so4(s) ,> 2ag+ + so4^-2 ksp = [ag+]^2[so4^-2] = 1.5 x 10^-5 = (0.30)^2[so4^-2] [so4^-2] = 1.5 x 10^-5/0.09 = 1.7 x 10^-4 caso4 would precipitate first since it requires less so4^- to form a saturated solution.  i believe this is right, i hope it !  

2520 = (10000)c (70-10) 0.00420 j/(gi°c)