What is number of mole in 3.6×10²⁴ atoms of lithium (atomic number of Li=7)

d.) circle motion requires a force to give it a centripetal acceleration.

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.