A rectangular tank measuring 27.0 cm x 7.0 cm x 11.25 cm contains a gas sample that has a density of 0.020 g/mL. What is
the mass of the gas contained in the tank

You use the atomic number to find out how many protons and neutrons there are in the atom. you use the atomic mass to find out how many protons and electrons there are in the atom. 

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.

Hello.the answer is  hydrosphere, geosphere, and biosphere  have a nice day