Question

Which has more atoms, 200gms of argon or 200 gms of neon?

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Answer 1

No. of moles = given mass/molar mass

Given mass 200gm

Neon molar mass=20gm

Argon molar mass=40gm

Neon moles =10

Argon moles =5

1 mole = $6.022\times {10}^{23}$particles

So neon has $60.22\times {10}^{23}$ atoms

Argon has $30.11\times {10}^{23}$ atoms.

Neon has more .