How many magnesium atoms are needed to form 39.1 g of magnesium oxide? 2 Mg + 102 → 2 Mgo
6.38 x 1023 atoms Mg
7.78 x 1023 atoms Mg
3.66 x 1023 atoms Mg
O 5.84 x 1023 atoms Mg

1.43 x 10^-11 j the guy commented the awnser just making sure u see it .

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.