The half-reaction at the cathode in an electrochemical cell is given below. What other half-reaction would most likely occur at the anode to produce a
spontaneous reaction?
Zn2+(aq) + 2e —> Zn(s)

A. H2(g) —> 2H+(aq) + 2e-

B. Al(s) —> Al3+ (aq) + 3e-

C. K^+ (aq) + e^- —> K (s)

D. Zn (s) —> Zn2^+ (aq) + 2e-

If equal masses of the listed metals were collected , which would have a greatest volume ? a. aluminum 2.70,b.zinc7.14,c.copper 8.92,d.lead 11.34

Calculate the number of molecules present in 0.750 mol of mgo.

There are 6.022, 104 atoms of hg in 1 mole of hg the number of atoms in 45 moles of hg can be found by multiplying 4.5 by 6.022, 102 which is the number of atoms in 4.5 moles of hg, correctly written in scientific notation with the correct number of significant figures? 0 21,109 0 21,100 271, 1024 27.099, 100 mark this and retum save and exit submit