Please answer this so I can proceed.

How much carbon is stored in the atmosphere as co2

What is the enthalpy of combustion (per mole) of c4h10 (g)? –2,657.5 kj/mol –5315.0 kj/mol –509.7 kj/mol –254.8 kj/mol

Use the periodic table to determine how many grams of oxygen would be required to react completely with 859.0 g c2h2