If the volume mixing ratio of gaseous ammonia (nh3) is measured to be 500 parts per trillion (pptv) at sea level pressure and t 15 °c: a) what is the mass mixing ratio of ammonia relative to dry air? b) what is the mass concentration of ammonia in ugm3? c) what is the molecular concentration of ammonia, and what would it be if the same air were lifted upward to a location where the pressure was 400 mb and the temperature 230 k? what would its mass concentration be at this pressure and temperature? d) considering your answer to part (c), why is it convenient to have mixing ratio as a way to express the amount of a pollutant? e) if mixing ratios are convenient, why is it necessary to use concentrations at all?

43.452

step-by-step explanation:

284 times .153 = 43.452

assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the and should be highlighted as well.