How many moles are in 7.91 X 1022 atoms of He?

amount of He = (7.91 × 10^22) ÷ (6.02 × 10^23) = 0.131mol (3sf)

Explanation:

you make use of the mole concept formula

amount(mol) = number of particles ÷ 6.02 × 10^23

(6.02 × 10^23 is the avogadro constant, which is an extremely important number in this formula for mole concept)

relative humidity is a measure of the amount of moisture in the air relative to the total amount of moisture the air can hold.

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