Amount of substance, measured in moles, is the chemist's way of counting particles in usable numbers. One mole contains the Avogadro number of particles, about 6.02 × 10²³. Set the amount and the molar mass, and read off how many particles and how much mass you have.
MissionPredict the number of molecules in 2.0 mol of any gas.Streak 0Best 0
The number of molecules in 2.0 mol of any gas is about:
amount of substance n2.0 mol
number of molecules N = n N₊1.2 × 10²⁴
mass m = nM64 g
N₊ = 6.02 × 10²³ mol⁻¹. The number of particles depends only on the amount in moles, not on which gas it is.