Calculate the mass of two helium atoms.

4 / N a

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2 / N a

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8 / N a

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1 / N a

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Solution

The correct option is D $8 / N a$
Avogadro's constant says that 1 mole of any atom contains Na atoms. In this case you have 2 atoms. moles of helium is = $\frac{2}{N a}$
The atomic mass of helium (He) will give you the weight of one mole of this molecule: 1 mol = 4.00 g
$\frac{2}{N a}$ moles mass = $4.00 g \times \frac{2}{N a}$ = $\frac{8}{N a}$
answer is C

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