Question Bank - General Science

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What is the number of moles of 'He' in 104 g of helium gas?

A.
52
B.
26
C.
13
D.
6.5

Solution:

He (Helium) is an inert gas. It has completely filled 2s orbital. The 'He' atom has an atomic weight of 4 grams. Calculation:Given that:104g Helium The formula to determine the number of moles isNo. of Moles = Molecular weight of He/Weight of HeThus we can write-4 grams of He occupy 1 mole.104/4=26 moles.26 moles of helium are present in 104g of He.

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