Enthalpies of Formation (Section)
The standard enthalpies of formation of gaseous propyne (C3H4), propylene (C3H6), and propane (C3H8) are +185.4, +20.4, and –103.8 kJ/mol, respectively: (a) Calculate the heat evolved per mole on combustion of each substance to yield CO2(g) and H2O(g). (b) Calculate the heat evolved on combustion of 1 kg of each substance. (c) Which is the most efficient fuel in terms of heat evolved per unit mass?
Meteorology Week 3 Notes 9/7/16 Day #5 Heat and Energy Class Lecture Continued Electromagnetic Waves (EM) (Radiation): • everything emits EM waves • radiates at wide range of wavelengths (spectrum) • total radiation energy depends on temperature (Stefan-Boltzmann Law) Wien’s Displacement Law • • Kirchhoff's Law Long waves vs. Short waves *measured by the distance between the waves* Reﬂected light Absorbed light Transmitted light Visible Light Spectrum: 0.4 um 0.7um (micrometer) “higher the temp, high