When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When

Question

When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 12.0 g of carbon were burned in the presence of 50.8 g of oxygen, 18.8 g of oxygen remained unreacted. What mass of carbon dioxide was produced?Express your answer to three significant figures and include the appropriate units.

Explanation / Answer

C(s) + O2(g) --> CO2(g) 12g (C) .... 50.8g (O2)................. initial amounts 0g(C) .........18.8g(O2) ................. amounts when reaction complete That means that C was the limiting reactant, and the amount of CO2 is based on the amount of carbon that burned. Covert 12 grams of carbon to moles. The moles of CO2 will be the same, since they are in a 1:1 mole ratio. Then convert the moles of CO2 to grams. 12g C x (1 mol C / 12.0 g C) x (1 mol CO2 / 1 mol C) x (44.0g CO2 / 1 mol CO2) =44 g of CO2

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