How much CO2 is produced from burning coal?

Taking coal to contain 50 percent carbon, which combines with oxygen during burning to form CO2, we can arrive at 1.83 kg CO2 for every 1 kg of coal burned. Another way to put it, taking the efficiency of power stations into account, is that 950 grams of CO2 is evolved for every KWh of electricity produced. Note that for natural gas it is more like 600 g per KWh for natural gas powered plants.