orangecrocodile767

The solubility product of PbBr2 is 8.9×10^-6 to determine the molar solubility a)in pure water b)in 0.2m KBr solution c)0.20m pb(No3)2 solution

-K varies in space.......-K is specific for a given species.......-K varies among populations......-K varies in time

1. The reaction that illustrates ΔH°f for Mg(NO3)2.
   
   
    
    
    
          → Mg(NO3)2 (s)

If p(x)=x⁴+x³+x²-1 and q(x)=-2x³+x²+x+1, which expression is equivalent to (p-q)(x)?

i) x⁴-x³+2x²+x,

ii)3x³-x-2,

iii)x⁴+3x³-2-x,

iv)x⁴+3x³+x²-2.

Ben, Carl, and Dan shared a box of marbles. Ben took half of the marbles in the box and returned 6. Then Carl took 1/6 of the remaining marbles and returned 6. Dan took the rest. If Dan received 41 marbles, how many marbles did Ben receive?