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What is the solubility of RaSO4 in 0.1381M Na2SO4? Ksp = 4.3x10^-11?

If you were to push a pile of books across a table, in which location would this be the easiest? The moon(my choice) Earth Same amount no matter the location Jupiter Suppose a large pizza is placed on earth, the moon, and Jupiter. In each location, the pi...

Ksp = [Ra^+2][SO4^-2] 4.3x10^-11 = [x][x] x=6.56x10^-6 6.56x10^-6 + .1381?? is that how im suppose to do it?

thanks a bunch!

Then why am I calculating the moles if I just need to look up the Change in H for products and reactants...that isn't going to give me the heat released. What formulas do I need to use?

So is it the one I chose or something else? Is it a,b,c, or d?