Question

. Find the mass of 2.61 moles of H2O2.

Answer 1

Mass of H₂O₂ = 88.778 g

Further explanation

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

$\large {\boxed {\boxed {\bold {mol = \frac {mass} {molar \: mass}}}}$

moles of H₂O₂ = 2.61

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

$\tt mass=mol\times MW\\\\mass=2.61\times 34,0147 g/mol\\\\mass=88.778~g$