What volume of hydrogen will be produced at STP by the reaction 673 g of magnesium with
excess water according to the following reaction?
Mg +2H20 --> Mg(OH)2 + H2

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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.