calculate the amount of carbondioxide that could produce........?

Question

calculate the amount of CO 2 that could be produced when
(i) 1 mole of carbon is burnt in air
(ii) 1 mole of carbon is burnt in 16 g of dihydrogen
(iii) 2 moles of carbon burnt in 16 g of dihydrogen

Answer 1

I presume that you mean dioxygen.

The question is meant to illustrate the concept of a limiting reagent.

In (i), carbon is the limiting reagent. You get one mole CO2, which you multiply by the formula mass of CO2 if you want your answer in g.

But 1 mol CO2 contains 2 mol O atoms, or 32 g oxygen.

So in (ii) or (iii), oxygen is the limiting the agent. The amount of CO2 you can make is less than in (i); and the answers to (ii) and (iii) are the same.

[Actually, if you burn carbon in a restricted supply of oxygen, you get carbon monoxide rather than carbon dioxide. You can ignore this when answering this question.]