Question

Silanes are silicon hydrides of general formula Si_nH_2n+2 and have several applications. From the data given below, the bond dissociation enthalpy of Si-Si bond can be deduced as

ΔH of the reaction 2Si(s) + 3H₂(g) →Si₂H₆(g) is 80.3 kJ mol^–1

Bond dissociation enthalpy for H – H = 436 kJ/mola

Bond dissociation enthalpy for Si – H = 304 kJ/mol

Δf_H [Si(g)] 450 kJ mol^–1

(A) – 304 kJ mol^–1 

(B) 384.3 kJ mol^–1 

(C) 304 kJ mol^–1 

(D) – 384.3 kJ mol^–1

Answer 1

Correct answer is (C) 304 kJ mol^–1