How many moles of methane (ch4) are in 7.31×10/25 molecules

One mole of any particles has 6.02 *10²³ these particles.

7.31*10²⁵*1 mol/6.02*10²³ ≈ 121 mol

Ans. : frostbite is when exposure to cold temperatures causes freezing to the skin or other tissues. it most commonly affects the hands, feet, and face. the longer areas are exposed to cold, typically the worse the frostbite. the water temperature used for rewarming a frostbitten part should be : (102 -105) f degrees.