The molar mass of C2H6 is 30.07 g/mol. This means that 350 grams of C2H6 contains 350/30.07 = 11.64 moles of C2H6. Each mole of C2H6 contains 2 moles of carbon, so 11.64 moles of C2H6 contains 2 * 11.64 = 23.28 moles of carbon. The molar mass of carbon is 12.01 g/mol, so 23.28 moles of carbon has a mass of 23.28 * 12.01 = 279.5 g.

Therefore, the mass of carbon found in 350 grams C2H6 is 279.5 grams.