Because a GJ is a measurement of energy, and m3 is a measurement of volume, the number of m3's in a GJ depends on the heat value of the gas. Gas is made up of many components, and each one of those contain different amounts of energy.
A rough average is about 40 GJ's in a e3m3 (1000 m3). So there is about 0.04 GJ's in one m3 of gas.
To get more specific, you'd need to know the heat value of the gas in question.
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