D.) black text on a yellow background. There is much more contrast in the colors black and yellow than the other choices.
Stir the water continuously, this is the only logical answer. Adding powdered sugar, decreasing the volume, increasing the amount of suga, cooling, all don't make the sugar dissolve quicker.
Tetraamminedichloridoiron(3) nitrate
0.08 because 4mol NO divided by 50g gives you your answer
