1. Neon gas consists if single atoms ,what mass of neon contain 6.022x10^23 atoms.

6.022*10²³ ATOMS OF NEON WILL WEIGH =20.1797g

AS 

1 MOLE OF NEON ATOM=ATOMIC MASS OF NEON= 20.1797g

ALSO 

1 MOLE OF NEON ATOM+6.022*10²³ ATOMS OF NEON

THEREFORE

6.022*1023 ATOMS OF NEON WILL WEIGH 20.1797g 

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