1. The problem statement, all variables and given/known data Using the table of atmospheric composition and residence time , calculate the rate of input for N2 and H2S. Question 5 answers A)N2: 4.1 x 1015 mol/yr; H2S: 9.6 x 1013 mol/yr B)N2: 1.4 x 1014 mol/yr; H2S: 9.0 x 109 mol/yr C)N2: 4.1 x 1015 mol/yr; H2S: 9.0 x 109 mol/yr D)N2: 1.4 x 1014 mol/yr; H2S: 3.3 x 1012 mol/yr 2. Relevant equations Residence time=N/R N=moles R= rate Residence time for H2S(1day), H2S(conc)=.05ppb 3. The attempt at a solution I found out the first part fine. I am having a hard time finding the rate of H2S. I started of converting ppb into grams and then getting the moles and dividing by the residence time in years. Any help would be great.