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).

Ithink the answer is pollution in the air steel made of iron and carbon

There is one s orbital, and there are three p orbitals, five d orbitals, and seven f orbitals. thus, the answer is b. do not confuse the number of orbitals in a subshell with the number of electrons the subshell can hold. each orbital can hold two electrons, so the capacity of an nf subshell is 14 electrons.