How many moles of helium gas are in 30.0L sample of He, if density of helium gas is 0.016 g/ml
Volume of the sample, V = 30.0 L
= 30000 ml
The density of the gas, D = 0.016 g/ml
Mass of helium in the sample,
"W = (D\u00d7V)"
"= (0.016 g\/ml) \u00d730000 ml"
Molar mass of helium, M = 4 g/mol
So, number of moles of, helium
n = (Mass of helium in the sample/Molar mass of helium)
= W/M mole
= (480/4) mole
= 120 mole
Hence, there are 120 moles of helium gas are in 30.0L sample of He.