19.You dissolve 15.71 g of NH4NO3 in 150.0 mL of solution (call this solution A). You take 20.0 mL of solutionA and add water until the total volume is 75.0 mL (call this solution B). You take 15.0 mL of solution B andadd 25.0 mL of water to it (call this solution C). You mix 10.0 mL of solution B and 10.0 mL of solution C(call this solution D). What is the concentration of ammonium nitrate in solution D?
(A) 0.190 M;
(B) 0.279 M;
(C) 0.131 M;
(D) 0.240 M;
(E) none of these