Question

Which has more atoms 200 g of argon or 200 g of neon?

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Answer 1

Molar mass= $\frac{GivenMass}{MolarMass}$

Given mass 200g

Neon's molar mass = 20g

Argon's molar mass = 40g

Neon moles =10

Argon moles = 5

1 mole = $6.023\times {10}^{23}$particles

So neon has $60.23\times {10}^{23}$ atoms

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

Neon has more atoms.