Covalent bonding is when electrons are shared between atoms.
Answer:
The change in enthaply when 10.0 g of nitrogen triiodide decomposes is -3.67 kJ.
Explanation:

Enthalpy of the reaction when 2 moles of nitrogen triiodide decomposed =

Enthalpy of the reaction when 1 moles of nitrogen triiodide decomposed :

Mass of nitrogen triiodide decomposed = 10.0 g
Moles of nitrogen triiodide = 
Change in enthaply when 0.02532 moles of nitrogen triiodide decomposed:

Answer: disruption and energy
Explanation:
A refractometer is an instrument used to measure the refractive index of gases, liquids, and translucent solids like gemstones. Liquids are tested for things such as blood proteins, salinity, fluid concentrations, and specific gravity of urine.
This is what I believe the name to be: Iron(11) Sulfide