How many molecules are in 17 amu of ammonia NH3?

To determine the number of molecules in 17 amu of ammonia (NH₃), we first note that the molecular weight of NH₃ is approximately 17 g/mol (1 nitrogen atom at ~14 amu and 3 hydrogen atoms at ~1 amu each). Since 17 amu corresponds to 1 mole of NH₃, we can use Avogadro's number, which is approximately (6.022 \times 10^{23}) molecules/mol. Therefore, there are about (6.022 \times 10^{23}) molecules in 17 amu of ammonia.