Question

5) (a) Calculate the standard enthalpy of formation of gaseous diborane (B2H6) using the…

5) (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

6) (a) 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?

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