please show all the steps

2. Calculations (1) At a refinery, assume there are 100 gas valves in a stream that, on average, contain 80 wt% nonmethane organic compounds, 10 wt% water vapor, 10 wt% methane, and no ethane (thus the TOC wt% would be 90). If the process operates 7500 h per year (h/year), use the emission factors provided by USEPA (Table 1) to estimate what are the hourly and annual TOC and VOC emissions from the 100 gas valves? Table 1 Refinery Screening Emission Factor (US EPA, 1995) Equipment type Service >>10,000 ppmv Emission