[gettyu]

Hello,
I have a doubt about quemistry that I could not do properly the maths that I want.

I work in a company and they have 100% CO2 in a huge gas tank, for welding, 15 bar, -30 degrees.
My company, pays to the company to fill the tank 250 €/TON of CO2, liquid.
But, when the welders do their job, they spent 8 l/minute (gas).

How can i get the properly the money that I spent in imagine 15 minutes of work.

Could you help me?

[Corribus]

Unless otherwise specified, you can probably assume that the gas flow rate is measured at standard temperature (273.15 K) and pressure (100,000 Pa). Using the ideal gas equation, then, you should be able to convert the gas volumetric flow rate in L/min to molar flow rate in mol/min, which is then easily converted to mass flow rate in g/min. It is then straightforward to determine the $$ spent per 15 min.

Or, you can use one of the many handy online tools available for doing mass flow rate unit conversions, e.g.

https://knf.com/en/us/solutions/technology/mass-flow-rate-calculator