Determine the electrical work required to produce one mole of hydrogen in the electrolysis of liquid water at 298 k and 1 atm. the chemical reaction is-
h2o(l) = h2 (g) + 0.5 o2 (g)
data (at 298 k and 1 atm): delta h= 286 kj for this reaction, sh2o =70 j/k , sh2o= 131 j/k and so2= 205 j/k

6. using 3 – 4 sentences explain (in your own words) why water expands when it freezes? 7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation.