(a) Calculate the standard enthalpy of formation of gaseous diborane (B2H6) using the following thermochemical information:
4 B(s) + 3 O2(g) -----> 2 B2O3(s) ?H°= -2509.1 kj
2 H2(g) + O2(g) -----> 2 H2O(l) ?H°= -571.7 kj
B2H6(g) + 3 O2(g) -----> B2O3(s) + 3 H2O (l) ?H°= -2147.5 kj
(b) What is the frequency of radiation whose wavelength is 5.0 X 10-5m? (b) What is the wavelength of radiations that has a frequency of 2.5 X 10 8 s-1?