What mass of carbon monoxide and carbon dioxide produced when a 5.00 g sample of pure carbon is burnt under the following conditions:
When elemental carbon is burned in the open atmosphere with plenty of oxygen gas present, the product is carbon dioxide.
However, when the amount of oxygen present during the burning of the carbon is restricted, carbon monoxide is more likely to result
2C + O2 --->2CO
When carbon is burnt in excess oxygen, the result is carbon dioxide. The equation of the chemical reaction that results in this is:
C + O2 --> CO2
One mole of carbon reacts with one mole of oxygen to give one mole of carbon dioxide.
When 5 g of carbon is burnt, the equivalent number of moles of carbon burnt is 5/12. The number of moles of carbon dioxide produced is also 5/12. As carbon dioxide has a molar mass of 44 g/mole, the mass of the product is 44*(5/12) = 18.33 g
When carbon is burnt in a restricted amount of oxygen, the result is the formation of carbon monoxide. The equation of this chemical reaction is:
2C + O2 --> 2CO
Two moles of carbon react with one mole of oxygen to give two moles of carbon monoxide.
5 g of carbon is equivalent to 5/12 moles of carbon. As each mole of carbon give one mole of carbon monoxide and the molar mass of carbon monoxide is 28, the mass of the carbon monoxide produced is 28*(5/12) = 11.67 g.