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PLEASE HELP!! DIMENSIONAL ANALYSIS AND MOLE CONVERSIONS CHEMISTRY!!

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

PLEASE HELP!! DIMENSIONAL ANALYSIS AND MOLE CONVERSIONS CHEMISTRY!! How many moles of helium gas are in 30.0L sample of He, if density of helium gas is 0.016 g/ class=

Answer :

Answer:

Moles of helium gas = 120

Explanation:

Given:

Volume of He = 30 L = 30,000 ml

Density of He = 0.016 g/ml

Find:

Moles of helium gas

Computation:

Mass = Volume of He x Density of He

Mass = 30,000 x 0.016

Mass = 480 gram

Moles of helium gas = 480 / 4

Moles of helium gas = 120

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