I think it's A. because the Earth won't always have the same tilt throughout it's whole life. The tilt of the axis will change, even if it's just ever so slightly. I hope this helps and i hope i'm right :)
Answer:
Arrow should be yeilds, THE COEFFICIENTS are mole ratios. So every 4 moles of NH3 or ammonia produce 6 moles of H2O water
Answer:The number of atoms in 2.0 mole Al is A. 2.0 Al atoms. B. 3.0 x 1023 Al atoms.
Secondly, is aluminum an atom or molecule? Aluminum is the second element in the thirteenth column of the periodic table. It is classified as a post-transition metal and a "poor metal". Aluminum atoms contain 13 electrons and 13 protons. There are 3 valence electrons in the outer shell.
I'm going to do it by stoichiometry :
molar mass of CH4 is 16
and there are 4 H atoms in each CH4 so one mole CH4 consists of 4 x 6.022x10^23 H atoms
so :
4gr CH4 x (1mole CH4 /16 gr CH4) x (4 x 6.022 x 10^23 H atoms/1mole CH4) =
=6.022 x 10^23 H atoms