To calculate the weight of 1 mole of neutrons in grams, we need to determine the mass of a single neutron and then multiply it by Avogadro's number (Nₐ), which represents the number of atoms or particles in one mole.

The mass of a single neutron is approximately 1.674927471 × 10⁻²⁷ kilograms (kg). Avogadro's number is approximately 6.02214076 × 10²³ particles per mole.

To convert kilograms to grams, we multiply by 1000.

So, the weight of 1 mole of neutrons can be calculated as follows:

Mass of 1 mole of neutrons = (Mass of 1 neutron) × (Avogadro's number)

Mass of 1 mole of neutrons = (1.674927471 × 10⁻²⁷ kg) × (6.02214076 × 10²³ particles/mole)

Mass of 1 mole of neutrons = 1.0086649158 × 10⁻³ kg

Converting kilograms to grams:

Mass of 1 mole of neutrons = (1.0086649158 × 10⁻³ kg) × (1000 g/kg)

Mass of 1 mole of neutrons ≈ 1.0086649158 grams

Therefore, 1 mole of neutrons weighs approximately 1.0086649158 grams.