Reactions of elements chemistry

Question

when added to a sealed flask and heated, 60.0g carbon and 160.0g of oxygen react to form 220.0g of carbon dioxide. How many grams of carbon are there in the container after the reaction has occurred?

Answer 1

CO2 has molar mass of 12 + 16 + 16 = 44 g/mole.  What % is carbon?

%C = 12g/44g(x100%) = 27.27%

If you have 220.0 g of CO2, how many g of C are in that?

220.g CO2 x 0.2727 = 60.0 g of C

How much C is left in the container if you started with 60.0 g?  NONE.