How many molecules of nitrogen are there in 7.55 moles of N₂?

Question

using dimensional analysis?

Answer 1

Use avogadro's number.

7.55 moles of N2 x 6.022 x 10²³ molecules / mole = 4.55 x 10²⁴ molecules of N2 in 7.55 moles of N2

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Dale S.