. Find the mass of 2.61 moles of H2O2.

Mass of H₂O₂ = 88.778 g

The mole itself is the number of particles contained in a substance amounting to 6.02.10²³  

Mole can also be determined if the amount of substance mass and its molar mass is known

moles of H₂O₂ = 2.61

So the mass of H₂O₂(MW=34,0147 g/mol) :

a sequence is a function whose domain is the set of natural numbers.

natural numbers are all the negative and positive integers