Although nitrogen trifluoride (NF₃) is a thermally stable compound, nitrogen triiodide (NI₃) is known to be a highly explosive material. NI₃ can be synthesized according to the equation

a. What is the enthalpy of formation for NI₃(s) given the enthalpy of reaction (-307 kJ) and the enthalpies of formation for BN(s) (-254 kJ/mol), IF(g) (-96 kJ/mol), and BF₃(g) (-1136 kJ/mol)?

b. It is reported that when the synthesis of NI₃ is conducted using 4 moles of IF for every 1 mole of BN, one of the by-products isolated is [IF₂]⁺[BF₄]^-. What are the molecular geometries of the species in this by-product? What are the hybridizations of the central atoms in each species in the by-product?  

Transcribed Image Text:

BN(s) + 3IF(g) →→→→→→ BF3(g) + NI3(s)