Texts: A power plant using a thermodynamic cycle with a thermal efficiency of 41% produces 700 million kWh per year of electricity; the fuel is natural gas. If the electric generator is 98% efficient, the combustor is 88% efficient, and gas costs $8/GJ, calculate:
1. The total gas energy content required per year, in GJ.
2. The annual expenditure on gas, in $.
3. The mass of CO2 emitted per year from the plant, in kg. Gas provides energy at a rate of 18.2 MJ/kg CO2 emitted.