Which of the following reactions will occur spontaneously as written?
a) 3fe2+ (aq) + cr3+ (aq) → cr (s) + 3fe3+ (aq)
b) 2cr3+ (aq) + 3sn2+ (aq) → 3sn4+ (aq) + 2cr (s)
c) sn4+ (aq) + fe2+ (s) → sn2+ (aq) + fe (s)
d) sn2+ (aq) + fe2+ (s) → sn4+ (aq) + fe3+ (aq)
e) 2cr (s) + 3fe2+ (s) → 3fe (s) + 2cr3+ (aq)

Chen drew a diagram to compare the ways in which different organisms obtain nitrogen. which label belongs to the area marked z?

What woukd most likely be the transmittance at a 0.70 m solution of solute a? a) 7.6%b) 1.1%c)4.0%d)4.6%

Consider the reduction reactions and their equilibrium constants. cu+(aq)+e−↽−−⇀cu(s)pb2+(aq)+2e−↽−−⇀pb(s)fe3+(aq)+3e−↽−−⇀fe(=6.2×108=4.0×10−5=9.3×10−3 cu + ( aq ) + e − ↽ − − ⇀ cu ( s ) k =6.2× 10 8 pb 2 + ( aq ) +2 e − ↽ − − ⇀ pb ( s ) k =4.0× 10 − 5 fe 3 + ( aq ) +3 e − ↽ − − ⇀ fe ( s ) k =9.3× 10 − 3 arrange these ions from strongest to weakest oxidizing agent.