Answer to Question #167080 in General Chemistry for Kevin

Question #167080

How many moles of helium gas are in 30.0L sample of He, if density of helium gas is 0.016 g/ml


1
Expert's answer
2021-02-28T06:22:06-0500

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"

"=480 g"

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.


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