If anyone is good with stoichiometry plz message me. ive done this test 7 time and only gotten 3/10​

Which function is performed by earths atmosphere? a. ultraviolet rays are prevented from reaching the ozone layer. b. earths temperature is raised and moderated by trapping in heat c. charged particles from the sun are prevented from reaching earth. d. magnetic charges from space are prevented from reaching earths surface.

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

Is 9 correct? and can someone me with 10? it’s due tomorrow, you