20) Consider the following reaction.
4 NH3(g) + 3 O2(g) → 2 N2(g) + 6 H2O(g)
How many grams of O2 are needed to react with 9.92 g of NH3?

b. th3 n4zc4 pl4t3 15 c0nv3rg1ng w1th the s0uth 4m3ric4n pl4t3.

the answer is c.the valence of the atoms combine .

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.