Question

Find the volume of 20 moles of He gas? ​

Answer 1

Answer:

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Explanation:

Assuming that helium behaves as an ideal gas, we know that a mole of ideal gas occupies 22.4 litres at STP. The atomic weight of helium is 4 g/mol, so 6 g is 1.5 moles. The volume occupied at STP, therefore, is 22.4 x 1.5 = 33.6 litres.

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Answer 2

Explanation:

We know that,

$\underline{\boxed{\sf Moles = \dfrac{Volume\:(in\: litre)}{22.4}}}$

$\sf 20 = \dfrac{Volume \: of \: He}{22.4}$

$\sf Volume \: of \: He = 20×22.4=448 \: litres$

Hence the volume of He in 20 moles is 448 litres.