0.5927-g sample was dissolved, and the Ca2+ and Ba2+ ions present were precipitated as BaC2O4

.H2O and

CaC2O4

.H2O. The oxalates were then heated in a thermogravimetric apparatus leaving a residue that weighed

0.5127 g in the range of 320°C–400°C and 0.4362 g in the range of 580°C–620°C. Calculate the percentage Ca

and percentage Ba in the sample.​

b. atoms in metallic solids are not arranged in a regular pattern

explanation:

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.