for the reaction represented by the equation C+ 2H2 ->CH4 how many moles of hydrogen are required to produce 10 mol of methane, CH4

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.

Ineed to find the answer of this question because i dont understand it

Asubstance is a good conductor of electricity which of the following best explains a probable position of the substance in a periodic table