Scientia Potentia Est

This particular mystery molecule may be harder than the last, so please enjoy, and comment below if you guess!

• Makes up 0.04% of the atmosphere
• Has a sublimation point of -78.5 °C
• Heat of combustion is 0 kJ/mol
• It’s essential for life as we know it
• It was discovered about 1630 by Jan von Helmont and it’s atomic makeup proposed by John Dalton in 1803
• Use in extinguishing fires
• It’s found in soft drinks
• Used to remove up to 99% caffeine from coffee to make decaf
• It’s generally considered non-toxic
• When dissolved, it increases acidity
• It has no taste, colour or smell
• Density is 1.98 kg/m^3
• It can exist in liquid form in deep ocean environments
• The average human produces and removes approximately 1 kg of this every 24 hours

And that’s all. Have fun guessing and remember to comment below if you’re inspired to guess!