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).
