Find out the values



(i) In an oven using coal (assume the coal is carbon in weight), insufficient oxygen is sup-plied such that 60% of carbon is converted to C${{O}{2}}$ and 40% carbon is converted to CO. Find out the heat generated when 10 kg of coal is burnt in this fashion.
(ii) Calculate the heat generated if a more efficient oven is used so that only C${{O}
{2}}$ is formed.
(iii) Calculate the percentage loss in heating value for the inefficient oven.