To calculate the number of molecules in 10 moles of NH3 (ammonia), we can use Avogadro's number (Nₐ), which represents the number of atoms, molecules, or ions present in one mole of a substance. Avogadro's number is approximately 6.022 x 10^23.

So, the number of molecules of ammonia in 10 moles of NH3 can be calculated as follows:

Number of molecules = Number of moles × Avogadro's number

Number of molecules = 10 moles × 6.022 x 10^23 molecules/mole

Number of molecules = 6.022 x 10^24 molecules

Therefore, there are 6.022 x 10^24 molecules of ammonia contained in 10 moles of NH3.