Which of these redox reactions is spontaneous as written?
ni + mg2+ → ni2+ + mg
al + fe3+ → al3+ + fe
hg + al3+ → hg2+ + al
zn + k+ → zn2+ + k

The lattice enthalpy (formation of ionic solid from ions in the gas phase) for agcl(s) is -916 kj/mol and the hydration enthalpy (dissolution of gaseous ions into water) is -850 kj/mol. how much heat (in joules) is involved in forming 1l of saturated agcl solution (1.8 × 10-4 g / 100 ml water) by dissolving agcl(s)? assume solution volume does not change much upon dissolution. the equations are given below. ag+(g) + cl−(g) æ agcl(s)