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發問:
inside level-one air quality office buildings, the concentrarion of carbon dioxide should not exceed 800 ppm9 parts permillion) express this concentrarion in microgram/m^3 units at 298K and 1.01*10^5Nm^-2 pressure.
最佳解答:
Consider 1 m3 of the air sample: Volume of CO2, V = 1 x [800/(1 x 106)] = 8 x 10-4 m3 Temperature, T = 298 K Pressure, P = 1.01 x 105 N m-2 Molar mass, M = 12.01 + 15x2 = 44.01 g mol-1 Gas constant, R = 8.314 J mol-1 K-1 Mass, m = ? g PV = nRT PV = (m/M)RT Mass of CO2, m = MPV/RT = (44.01)(1.01 x 105)(8 x 10-4) / (8.314)(298) = 1.44 g Concentration of CO2 = 1.44 x 106 μg/m3
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chem question on concentration發問:
inside level-one air quality office buildings, the concentrarion of carbon dioxide should not exceed 800 ppm9 parts permillion) express this concentrarion in microgram/m^3 units at 298K and 1.01*10^5Nm^-2 pressure.
最佳解答:
Consider 1 m3 of the air sample: Volume of CO2, V = 1 x [800/(1 x 106)] = 8 x 10-4 m3 Temperature, T = 298 K Pressure, P = 1.01 x 105 N m-2 Molar mass, M = 12.01 + 15x2 = 44.01 g mol-1 Gas constant, R = 8.314 J mol-1 K-1 Mass, m = ? g PV = nRT PV = (m/M)RT Mass of CO2, m = MPV/RT = (44.01)(1.01 x 105)(8 x 10-4) / (8.314)(298) = 1.44 g Concentration of CO2 = 1.44 x 106 μg/m3
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