Answer:
2.4 x 10^23 molecules
Step-by-step explanation:
The Avogadro's Constant is equal to 6.022 x 10^23 for one mole of substance
1 mole = 6.022 x 10^23
so 0.4 mole = (0.4 x 6.022 x 10^23)/1 = 2.4 x 10^23 molecules
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