How many are A) $ 2$ moles of helium atoms ? B) $ 1.2 \cdot 10^{-13} $ moles of water molecules ?

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2 moles of helium atoms are $ 2 \cdot 6.023 \cdot 10^{23} = 1.205 \cdot 10^{24} $ helium atoms.

$1.2 \cdot 10^{-13} $ moles of water molecules are $ 1.2 \cdot 10^{-13} \cdot 6.023 \cdot 10^{23} = 7.408 \cdot 10^{10} $ water molecules.