Question

Calculate the number of moles for:
a) 12.044x 10^23 atoms of He.
b) 32 grams of water.
C) 17 grams of NH3.​

Answer 1

One mole of any element contains 6.022 X 1023 atoms of the element. Thus 1 mole of He atom consists of 6.022 X 1023 atoms of He. Thus

6.022 X 1023 atoms of He = 1 mole of He atom

1 atom of He = 1 / ( 6.022 X 1023) moles of He

So 12.044 X 1023 atoms of He = ( 1 X 12.044 X 1023) / ( 6.022 X 1023) moles of He

= 2 moles of He atom

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

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