[Maharg]

Hi I have an environmental chemistry problem. I need to be able to understand how to figure out how much 280 ppm CO2 is to Kg Carbon.

My question does tell me that 360 ppm CO2 in modern time relates to atmospheric carbon pool of 7.74E14 kg C.

I tried calculating molecular mass of atmosphere which is 28.96 g/mol.

Took 360 ppm = 360E-6 multiplied it by 44 g/mol CO2.

I got 0.01584 g/mol then divided this by molecular mass of atmosphere so CO2 is 0.05469%. I'm stuck and don't know how to relate this percent to  mass of carbon.

I have also been suggested to use it a proportion so if 7.74E14 kg relates to 360 then 280 ppm CO2 relates to 6.02E14 Kg Carbon, but this doesn't seem right to me. I think I have to do something with the 28.96 g/mol as our prof made sure we could do this in lecture.