A cubic metre of gas at normal temperature and pressure has a mass of 44.643 times the molecular weight of the gas in grams.
So a cubic metre of hydrogen is 89.3 grams while a cubic metre of CO2 is 1964 grams.
If the volume is 22.4 litres, the mass in grams equals the molecular weight.
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You calculate the total cost of 1 cubic meter reinforcement cement for heavy foundation work by adding all of the costs. Essentially you would have to figure out the total of pounds of concrete for 1 cubic meter multiply that by the cost per pound and then add in the cost of labor it takes to pour 1 cubic meter.
The answer will depend on the pressure under which the gas is kept.
Kilogram per cubic meter is the one that doesn't belong. Square meter is meter^2 and cubic meter is meter^3 but kilogram per cubic meter is a density
Depends on the density of the gas.