Ithium metal reacts with water to give lithium hydroxide and hydrogen gas. if 75.5 ml of hydrogen gas is produce at stp, what is the mass of lithium metal that reacted?

altitude, density, pressure

air gets less dense the higher the altitude and also the air pressure is less as altitude rises.

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.