Question

calculate the number of moles for the following..

a) 52 g of He. ( find more from mass )

b) 12.044 x 10²³ number of He atoms ( find mole from the number of particles )

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Answer 1

Answer:

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Answer 2

a The molar mass that is the mass of 6.022 X 1023 atoms of helium is 4g. Hence 1 mole of He = 4 g of He = 6.022 X 1023atoms of He. 1 g of He = (6.022 X 1023) / 4 atoms of He. 52 g of He = (6.022 X 1023X 52 ) / 4 atoms of He.

b Thus there are 2 moles of He atom in 12.044 X 1023 atoms of He.