If you want to make 100 grams of ammonia, how many grams of hydrogen should react

Well, since ammonia has the chemical formula NH3. Therefore the
relative atomic mass is 17 (14+(1)3). So 100 divided by 17, times 3
= 17.64705882352941g. I did this in order to figure out firstly,
how much the weight of 1 of the 17 nuclear particles, which make up
ammonia, would have to be present (in grams) for everything to be
in proportion to which would make 100g. Then by timesing it by 3
shows how much the 3 hydrogen atoms contributed in weight towards
the 100 grams. To prove that 17.64... is correct you can add
(100/(17) X (17-3).

Just took the quiz on edgenuity and the correct answer is "c.  4.54 x  10–12  j"