Ammonia (NH_3(g)) is released to the atmosphere during the breakdown of urea at

Question

Ammonia (NH_3(g)) is released to the atmosphere during the breakdown of urea at cattle feed lots. Todd et al. (2015) quantified ammonia releases from cattle feed lots in a paper entitled. "Ammonia losses and nitrogen partitioning at a southern High Plains open lot dairy", published in Atmospheric Environment 110:75-83. As you can see from the paper, the ammonia concentrations vary quite a bit over the open lots and the lagoons. Using a gaseous ammonia concentration of 200 g/m^3 what would be the partial pressure of ammonia in atm at 25degree C? R = 0.08206 L-atm/mole-K H_NH_3 (units assumed to be atm/M) = 0.0171 Answers: or

Explanation / Answer

Density of air = 1.225 Kg/m3 = 1225 g/m3

average molar mass of air = 28.97 g/mol

Hence average number of moles of per m3 air = 1225 g / 28.97 g/mol /m3 = 42.3 mol/m3

Givent the composition of NH3 in air = 200 g/m3

Hence moles of NH3 per m3 of air = 200 g/m3 / 17 g/mol = 11.765 mol/m3.

mole fraction of NH3, XNH3 = 11.765 mol / 42.3 mol/m3 = 0.278

Hence partial pressure due to NH3 = 0.278 x 1 atm = 0.278 atm

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